All-solid- state battery, and method for measuring thickness of all-solid-state battery

Abstract

The present disclosure can provide an all-solid-state battery comprising at least one electrode and an electrolyte layer, wherein the electrode includes a current collector and an active material layer, and SdR1 according to equation 1 is at least 1. [Equation 1] SdR1=Sd2,0.2 / Sd5,0.5 In equation 1, Sd2 ,0.2 is the standard deviation for binding force of the active material layer that is repeatedly measured three times by performing oblique cutting from the surface of the active material layer at a horizontal-direction speed of 2 μm / s and a vertical-direction speed of 0.2 μm / s, and Sd5 ,0.5 is the standard deviation for binding force of the active material layer that is repeatedly measured three times by performing oblique cutting from the surface of the active material layer at a horizontal-direction speed of 5 μm / s and a vertical-direction speed of 0.5 μm / s.

Description

All-solid-state batteries and methods for measuring the thickness of all-solid-state batteries

[0001] The present disclosure relates to an all-solid-state battery and a method for measuring the thickness of the all-solid-state battery.

[0002] As the development of electric vehicles, energy storage batteries, robots, satellites, and other devices accelerates, research on high-performance rechargeable secondary batteries that can be repeatedly charged and discharged as an energy source is actively underway.

[0003] Currently commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries (hereinafter referred to as lithium-ion batteries or lithium batteries) have the advantage of virtually no memory effect compared to nickel-based secondary batteries, allowing for free charging and discharging, a very low self-discharge rate, and high energy density.

[0004] Typically, a lithium secondary battery may include a cathode, anode, a separator, and an electrolyte, the electrolyte being in a liquid state at room temperature. However, liquid electrolytes can leak outward due to external impacts, reducing battery performance and posing safety risks. To address these issues, all-solid-state batteries, in which the electrolyte is solid at room temperature, are actively being researched.

[0005] In addition, when measuring the thickness of the components within an all-solid-state battery, measurements are made using images from a micrometer or scanning electron microscope, but these have problems such as large measurement errors, requiring a lot of preparation, or being inefficient.

[0006] [Prior Art Literature]

[0007] (Patent Document 1) Republic of Korea Publication No. 10-2016-0060171 (Title of the invention: Cathode for all-solid-state battery, manufacturing method thereof, and all-solid-state battery including same)

[0008] According to one aspect of the present disclosure, an all-solid-state battery can be provided that has a high reproducibility due to a small deviation in the measured bonding force value even when the bonding force is measured at a relatively high speed. Furthermore, according to one aspect of the present disclosure, a method for measuring the bonding force within an electrode in an all-solid-state battery while ensuring a high reproducibility can be provided. Furthermore, according to one aspect of the present disclosure, a method for more quickly and accurately measuring the thickness of the all-solid-state battery can be provided based on the method for measuring the bonding force.

[0009] The all-solid-state battery according to one aspect of the present disclosure and the method for measuring the adhesion or thickness of the all-solid-state battery can be widely applied to green technology fields such as electric vehicles, battery charging stations, and other battery-using solar and wind power generation. In addition, the all-solid-state battery according to one aspect of the present disclosure and the method for measuring the adhesion or thickness of the all-solid-state battery can be applied to eco-friendly electric vehicles or hybrid vehicles that prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0010] An all-solid-state battery according to one aspect of the present disclosure comprises at least one electrode and an electrolyte layer, wherein the electrode comprises a current collector and an active material layer, and S according to the following formula 1 dR1 This can be more than 1.

[0011] [Formula 1]

[0012] S dR1 =S d2 ,0.2 / S d5 ,0.5

[0013] In the above formula 1, S d2 ,0.2 is the standard deviation of the bonding force of the active material layer measured three times by cutting at an inclined speed of 2 ㎛ / s in the horizontal direction and 0.2 ㎛ / s in the vertical direction from the surface of the active material layer, and S d5 ,0.5 is the standard deviation of the bonding force of the active material layer measured three times by cutting at an inclined speed of 5 ㎛ / s in the horizontal direction and 0.5 ㎛ / s in the vertical direction from the surface of the active material layer.

[0014] In an all-solid-state battery according to one aspect of the present disclosure, S according to the above formula 1 dR1 can be less than 10.

[0015] In an all-solid-state battery according to one aspect of the present disclosure, the active material layer is a positive electrode active material layer, and S according to the above formula 1 d5 ,0.5 may be less than 0.02.

[0016] In an all-solid-state battery according to one aspect of the present disclosure, the active material layer is a negative active material layer, and S according to the above formula 1 d5 ,0.5 may be less than 0.02.

[0017] In an all-solid-state battery according to one aspect of the present disclosure, S in the above formula 1 d2 ,0.2 and S d5,0.5 It may be the standard deviation of the bonding strength of the active material layer measured three times by cutting the slope independently at 2.5 to 6 degrees.

[0018] In an all-solid-state battery according to one aspect of the present disclosure, the bonding force of the active material layer may be measured at a cutting depth of 20% to 80% of the total thickness from the surface of the active material layer.

[0019] In an all-solid-state battery according to one aspect of the present disclosure, the bonding force of the active material layer can be measured by a surface and interfacial cutting analysis system (SAICAS) including a blade.

[0020] In an all-solid-state battery according to one aspect of the present disclosure, the bonding force (P) of the active material layer may be measured according to the following mathematical formula 2.

[0021] [Formula 2]

[0022]

[0023] In the above formula 2, F h is the horizontal force (N) applied to the blade, and w represents the width (mm) of the blade.

[0024] In an all-solid-state battery according to one aspect of the present disclosure, the thickness of the active material layer may be in a range of 22 μm to 130 μm.

[0025] In an all-solid-state battery according to one aspect of the present disclosure, the active material layer and the electrolyte layer may be in close contact by being pressurized at a pressure of 200 MPa or more.

[0026] In an all-solid-state battery according to one aspect of the present disclosure, the active material layer may include an active material and a binder.

[0027] In an all-solid-state battery according to one aspect of the present disclosure, the electrolyte layer may include at least one selected from the group consisting of a polymer electrolyte, an oxide electrolyte, and a sulfide electrolyte.

[0028] A method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure comprises: the all-solid-state battery includes at least one electrode and an electrolyte layer, the electrode includes a current collector and an active material layer, and includes a step of obliquely cutting from a surface of the active material layer, wherein the obliquely cutting step can be performed at a horizontal speed of 1 μm / s to 10 μm / s and a vertical speed of 0.05 μm / s to 1 μm / s.

[0029] In a method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the step of cutting at an angle can be performed at a cutting angle of 2.5 degrees to 6 degrees.

[0030] In a method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the inclined cutting step can be performed using a surface and interfacial cutting analysis system (SAICAS) including a blade.

[0031] In a method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the step of performing inclined cutting may include a step of obtaining load data according to cutting time, and may further include a step of measuring the thickness of the active material layer using the load data according to the cutting time.

[0032] In a method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the load data according to the cutting time includes first load data and second load data, and the first load data is a graph in which the first axis is the cutting time and the second axis perpendicular to the first axis is the load value, and the second load data is a graph in which the first axis is the cutting time and the third axis perpendicular to the first axis is the cutting depth, and the load value may be a vertical force applied to the blade.

[0033] In a method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the step of measuring the thickness of the active material layer includes a step of deriving a maximum cutting time at which the cutting time is the largest among points where the slope is 0 in the graph of the first load data, and a step of deriving a corresponding cutting depth corresponding to the maximum cutting time in the graph of the second load data, wherein the corresponding cutting depth can be determined as the thickness of the active material layer.

[0034] In the method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the maximum load value in the graph of the first load data may be 3 N or less.

[0035] In a method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the step of measuring the thickness of the active material layer includes a step of deriving a point cutting time, which is a cutting time at a point where the slope is 0 in a graph of the first load data, and a step of deriving a corresponding cutting depth corresponding to one of the point cutting times within a range of predetermined cutting depths in a graph of the second load data, and the corresponding cutting depth can be determined as the thickness of the active material layer.

[0036] In the method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the range of the predetermined cutting depth may be 22 μm or more.

[0037] In the method for measuring the thickness of an all-solid-state battery according to one aspect of the present disclosure, the step of deriving the corresponding cutting depth includes the step of deriving the maximum corresponding cutting depth corresponding to the maximum point cutting time among the point cutting times within a range of predetermined cutting depths, and the maximum corresponding cutting depth can be determined as the thickness of the active material layer.

[0038] According to one aspect of the present disclosure, when the binding strength of an electrode active material layer satisfies certain conditions, an all-solid-state battery including the same may exhibit excellent electrochemical performance. Furthermore, the battery may exhibit excellent charging capacity and excellent charge-discharge characteristics.

[0039] According to one aspect of the present disclosure, when the bonding strength of the electrode active material layer satisfies specific conditions, the film strength of the electrode active material layer is high, thereby providing excellent charging capacity and charge / discharge characteristics.

[0040] According to one aspect of the present disclosure, S according to formula 1 dR1 An all-solid-state battery including an electrode active material layer having a value of 1 or greater can have excellent charge capacity and charge-discharge characteristics.

[0041] According to one aspect of the present disclosure, S according to formula 1 dR1 When the bonding force of the electrode active material layer is formed so that the value is 1 or more, an all-solid-state battery including the same can have excellent charging capacity and charge-discharge characteristics.

[0042] According to one aspect of the present disclosure, S according to formula 1 dR1 When the value is 1 or more, the electrode active material layer can have a dense structure, and in this case, an all-solid-state battery including it can have excellent charging capacity and charge-discharge performance.

[0043] According to one aspect of the present disclosure, even when measuring the bonding force at a relatively high speed, the measured bonding force value has a small deviation, ensuring high reproducibility. Furthermore, according to one aspect of the present disclosure, the bonding force within an electrode in an all-solid-state battery can be measured with high reproducibility. Furthermore, according to one aspect of the present disclosure, the thickness of the all-solid-state battery can be measured more quickly and accurately based on the method for measuring the bonding force.

[0044] The drawings shown in this disclosure are according to examples of this disclosure, and the ratios of width, width, or thickness (or height) of each component are for the purpose of explaining this disclosure in detail, and these ratios may differ from the actual ones. In addition, in the coordinate system shown in the drawings, each axis may be perpendicular to each other, and the direction pointed by the arrow may be the + direction, and the direction opposite to the direction pointed by the arrow (rotated by 180 degrees) may be the - direction.

[0045] FIG. 1 is a schematic diagram illustrating at least a portion of an all-solid-state battery according to one embodiment of the present disclosure.

[0046] FIGS. 2 to 5 are schematic drawings illustrating a process of cutting at least a portion of an all-solid-state battery using a cutting device according to one embodiment of the present disclosure.

[0047] FIG. 6 is a schematic drawing illustrating at least a portion of a cutting device according to one embodiment of the present disclosure.

[0048] FIG. 7 is a graph showing an example of load data according to cutting time according to one embodiment of the present disclosure.

[0049] FIG. 8 is a graph showing an example of first load differentiation data according to one embodiment of the present disclosure.

[0050] FIG. 9 shows a scanning electron microscope image of an anode according to one embodiment of the present disclosure.

[0051] Hereinafter, the present disclosure will be described in detail with reference to the attached drawings. However, these are merely exemplary and the present disclosure is not limited to the specific embodiments described as examples.

[0052] Among the properties mentioned in this disclosure, if the measurement temperature affects the properties, the properties are properties measured at room temperature and pressure, unless otherwise specified.

[0053] The term room temperature used in this disclosure refers to a natural temperature that is not heated or cooled, and may mean, for example, any temperature within the range of 10°C to 30°C, for example, a temperature that is about 15°C or higher, about 18°C ​​or higher, about 20°C or higher, about 23°C or higher, about 27°C or lower, or 25°C. Unless specifically defined in this disclosure, the unit of temperature is Celsius (°C).

[0054] Among the properties mentioned in this disclosure, if the measurement pressure affects the property, the property is a property measured at atmospheric pressure unless otherwise specified. The term atmospheric pressure used in this disclosure refers to the natural pressure that is neither pressurized nor depressurized, and typically refers to atmospheric pressure within the range of approximately 700 mmHg to 800 mmHg.

[0055] The terms a to b used in this disclosure mean including a and b and within the range between a and b. For example, including by weight a to b means including within the range of by weight a to b.

[0056] In the present disclosure, the term "battery" may be used with the same meaning as "cell," and the term "battery" or "cell" may be a general term for a battery cell, which is a unit thereof, or a battery module or battery pack including the battery cell. Furthermore, in the present disclosure, the term "all-solid-state battery" may be one of several types of batteries, and may refer to a battery cell including an electrolyte layer. Furthermore, the electrolyte layer may be solid at room temperature.

[0057] The term "all-solid-state battery" in the present disclosure is used only as an all-solid-state battery in the art, and the all-solid-state battery may include a liquid or vapor state substance.

[0058] The term "relatively high speed" used in this disclosure may mean relatively fast. For example, measuring by cutting at a horizontal speed of 5 μm / s and a vertical speed of 0.5 μm / s may be considered a relatively fast cutting by cutting at a vertical speed of 0.5 μm / s, rather than measuring by cutting at a horizontal speed of 2 μm / s and a vertical speed of 0.2 μm / s.

[0059] According to one aspect of the present disclosure, an all-solid-state battery (10) can be provided that has a high reproducibility due to a small deviation in the measured bonding force value even when the bonding force is measured at a relatively high speed (see FIG. 1). Furthermore, according to one aspect of the present disclosure, a method for measuring the bonding force within an electrode in an all-solid-state battery (10) while ensuring a high reproducibility can be provided. Furthermore, according to one aspect of the present disclosure, a method for more quickly and accurately measuring the thickness of the all-solid-state battery (10) can be provided based on the method for measuring the bonding force.

[0060] FIG. 1 is a schematic diagram illustrating at least a portion of an all-solid-state battery (10) according to one embodiment of the present disclosure. The structure of the all-solid-state battery (10) according to one aspect of the present disclosure is not limited to the structure disclosed in FIG. 1, and those skilled in the art may appropriately modify the design of the structure according to their purpose.

[0061] Referring to FIG. 1, an all-solid-state battery (10) according to one aspect of the present disclosure may include at least one electrode (20) and an electrolyte layer (30). The structure of the all-solid-state battery (10) may refer to a known structure. In addition, the electrode (20) may include a current collector (110, 210) and an active material layer (120, 220). In addition, the active material layer (120, 220) in the electrode (20) may be positioned on one or both sides of the current collector (110, 210). In addition, the active material layer (120, 220) may include an active material. In addition, the active material layer (120, 220) may include a binder. In addition, the active material layer (120, 220) may include an active material and a binder, as will be described later, and may further include a material such as a conductive material, as needed.

[0062] Meanwhile, the active material layer (120, 220) located on one side of the current collector (110, 210) in the electrode (20) may have a single-layer structure or a multilayer structure. In addition, the active material layers (120, 220) located on both sides of the current collector (110, 210) in the electrode (20) may each independently have a single-layer structure or a multilayer structure. If the active material layers (120, 220) have a multilayer structure, the types and content ratios of the active material and binder included in each layer may also be configured independently.

[0063] Referring to FIG. 1, the electrolyte layer (30) may include an electrolyte. The electrolyte may include a solid electrolyte that is solid at room temperature. If necessary, the electrolyte may further include a liquid electrolyte that is liquid at room temperature. Meanwhile, the active material layer (120, 220) of the electrode (20) may include the electrolyte.

[0064] Referring to FIG. 1, the current collector (110, 210) may have an appropriate thickness, and is not particularly limited thereto, but may have a thickness of, for example, 1 μm to 30 μm. In addition, the active material layer (120, 220) may have an appropriate thickness, and is not particularly limited thereto, but may have a thickness of, for example, 22 μm to 130 μm. The thicknesses of the current collector (110, 210) and the active material layer (120, 220) may vary depending on the design.

[0065] Meanwhile, when the term “current collector” is used in this specification without distinction between the positive and negative electrodes, it may be a term encompassing both the positive current collector (110) and the negative current collector (210). In addition, when the term “active material layer” is used in this specification without distinction between the positive and negative electrodes, the active material layer may be a term encompassing both the positive active material layer (120) and the negative active material layer (220). In addition, when the term “active material” is used in this specification without distinction between the positive and negative electrodes, it may be a term encompassing both the positive active material and the negative active material. In addition, when the term “binder” is used in this specification without distinction between the positive and negative electrodes, it may be a term encompassing both the positive binder and the negative binder. In addition, in some cases, when the term “binder” is used without distinction between the positive electrode, the negative electrode, and the electrolyte layer, it may be a term encompassing both the positive binder, the negative binder, and the electrolyte binder.

[0066] Referring to FIG. 1, an all-solid-state battery (10) according to one aspect of the present disclosure may include at least one positive electrode (100) and at least one negative electrode (200) as electrodes. The positive electrode (100) may refer to a reduction electrode that receives charge carriers when the all-solid-state battery (10) is discharged. The negative electrode (200) may refer to an oxidation electrode that transfers charge carriers when the all-solid-state battery (10) is discharged. Meanwhile, the electrolyte layer (30) of the all-solid-state battery (10) may allow charge carriers to pass while preventing electrical short-circuiting between the positive electrode (100) and the negative electrode (200). Here, the charge carriers may be lithium ions (Li + ) may be.

[0067] Referring to FIG. 1, in an all-solid-state battery (10) according to one aspect of the present disclosure, a positive electrode (100) may include a positive electrode current collector (110) and a positive electrode active material layer (120). The positive electrode active material layer (120) may be positioned on one or both sides of the positive electrode current collector (110).

[0068] Referring to FIG. 1, in an all-solid-state battery (10) according to one aspect of the present disclosure, a positive electrode collector (110) is not particularly limited, but may be, for example, a plate structure, a foil structure, or a carbon-coated foil structure made of aluminum (Al), indium (In), copper (Cu), magnesium (Mg), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), germanium (Ge), lithium (Li), or an alloy thereof. The positive electrode collector (110) may be a foil structure including aluminum. The positive electrode collector (110) may have an appropriate thickness, for example, may have a thickness within a range of 1 μm to 30 μm.

[0069] Referring to FIG. 1, in an all-solid-state battery (10) according to one aspect of the present disclosure, a cathode active material layer (120) may include a cathode active material. The cathode active material may include a material capable of reversibly absorbing and releasing a charge carrier (e.g., lithium ion). The cathode active material is not particularly limited as long as it is used in the art, and may include, for example, one or more selected from the group consisting of lithium cobalt oxide (LCO), lithium nickel oxide (LNO), lithium nickel-cobalt oxide (LNCO), lithium nickel-cobalt-aluminum oxide (NCA), lithium nickel-cobalt-manganese (NCM) oxide, lithium nickel-cobalt-manganese-aluminum oxide (NCMA), and lithium iron phosphate (LFP).

[0070] In addition, the positive electrode active material layer (120) may include a positive electrode binder. The positive electrode binder may include a material that can increase the internal bonding strength of the positive electrode active material layer (120) and improve the adhesive strength with the positive electrode current collector (110). The above-mentioned positive electrode binder is not particularly limited as long as it is used in the art, and may include, for example, one or more selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene (PVDF-co-HFP), polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), styrene butadiene rubber (SBR), butadiene rubber (BR), acrylonitrile-butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), and polyethylene oxide (PEO).

[0071] In addition, the positive electrode active material layer (120) may contain a positive electrode active material and a positive electrode binder in an appropriate ratio. The positive electrode active material layer (120) may contain a positive electrode binder in an amount of about 0.1 to 10 parts by weight based on 100 parts by weight of the positive electrode active material. When the positive electrode active material layer (120) contains a positive electrode active material and a positive electrode binder in a combined state as described above, the internal bonding force can be increased and the adhesive force with the positive electrode current collector (110) can be improved, thereby ensuring stability and securing excellent energy capacity.

[0072] In addition, the positive electrode active material layer (120) may include a conductive material. The conductive material may include a material that can enhance conductivity and / or mobility of lithium ions or electrons. The conductive material is not particularly limited as long as it is used in the art, and may include, for example, one or more selected from the group consisting of carbon-based conductive materials such as graphite, carbon black, and carbon nanotubes, and metal-based conductive materials such as tin, tin oxide, titanium oxide, LaSrCoO3, and LaSrMnO3.

[0073] In addition, the positive electrode active material layer (120) may contain a positive electrode active material and a conductive material in an appropriate ratio. The positive electrode active material layer (120) may contain a conductive material in an amount of about 0.1 to 10 parts by weight relative to 100 parts by weight of the positive electrode active material. When the positive electrode active material layer (120) contains a positive electrode active material and a conductive material in a combined state as described above, it can provide better conductivity and secure excellent energy capacity.

[0074] In addition, the positive electrode active material layer (120) may include an electrolyte as described above. The electrolyte of the same type as the electrolyte included in the positive electrode active material layer (120) may be included in the electrolyte layer (30). In addition, the electrolyte included in the positive electrode active material layer (120) may include at least one selected from the group consisting of a polymer electrolyte, an oxide electrolyte, and a sulfide electrolyte. The electrolyte included in the positive electrode active material layer (120) may refer to the contents described in the electrolyte layer (30) described below.

[0075] In addition, the positive electrode active material layer (120) may contain a positive electrode active material and an electrolyte in an appropriate ratio. The positive electrode active material layer (120) may contain an electrolyte in an amount of about 1 to 30 parts by weight relative to 100 parts by weight of the positive electrode active material. If the positive electrode active material layer (120) contains a positive electrode active material and an electrolyte in a combined state as described above, it may provide better ionic conductivity.

[0076] In addition, the positive electrode active material layer (120) may include one or more additives selected from the group consisting of a thickener, a filler, a dispersant, and an ion conductor, as needed.

[0077] In addition, the positive electrode active material layer (120) may be formed from a positive electrode active material slurry composition. Specifically, the positive electrode active material layer (120) may be formed through a step of applying the positive electrode active material slurry composition onto a positive electrode current collector (110) and then drying it. In the present disclosure, the positive electrode active material layer (120) may refer to the positive electrode active material slurry composition dried as described above.

[0078] The positive electrode active material slurry composition capable of forming the positive electrode active material layer (120) may include the positive electrode active material, positive electrode binder, conductive material, etc. described above. In addition, the positive electrode active material slurry composition may include a solvent to ensure appropriate processability. The solvent may be determined according to the positive electrode active material or positive electrode binder included in the positive electrode active material slurry composition, and is not particularly limited as long as it is used in the art. The solvent may be, for example, a non-polar solvent, a low-polarity solvent, or a combination thereof. For example, the organic solvent is not particularly limited, but may include, but is not limited to, a tertiary amine solvent such as triethylamine; an ester solvent such as butyl butyrate; an aromatic solvent such as benzene, toluene, xylene, methoxybenzene, and anisole; It may include at least one selected from the group consisting of chain-like aliphatic solvents such as hexane, heptane, octane, nonane, and decane, and cyclic aliphatic solvents such as cycloheptane. In addition, in the step of drying after applying the positive electrode active material slurry composition, the drying may mean a process of removing the solvent included in the positive electrode active material composition so that the positive electrode active material layer (120) includes the solvent in an amount of 1 wt% or less, 0.5 wt% or less, or 0.1 wt% or less relative to the total weight. In addition, the method of applying the positive electrode active material slurry composition may be performed according to a known method, and may be performed, for example, by a method using a slot die, a doctor blade method, a dip method, a reverse roll method, a direct roll method, a gravure method, an extrusion method, or a brushing method. In addition, the positive electrode active material slurry composition may be applied in an appropriate loading amount in consideration of the thickness of the desired positive electrode active material layer (120). Meanwhile, the positive electrode active material layer (120) may be rolled for miniaturization and higher energy density. The rolling may be performed according to a known method, for example, using a rolling jig.

[0079] The above-described positive electrode active material layer (120) may be in a state in which the positive electrode active material slurry composition is dried as described above and the solvent is removed due to the drying. Here, the state in which the solvent is removed may mean that the solvent is included in an amount of 1 wt% or less, 0.5 wt% or less, or 0.1 wt% or less relative to the total weight of the positive electrode active material layer (120), or that the solvent is not included.

[0080] Referring to FIG. 1, in an all-solid-state battery (10) according to one aspect of the present disclosure, the electrode active material layer (120, 220) may have an appropriate thickness. Although not specifically limited, for example, the thickness of the electrode active material layer (120, 220) may be 22 μm or more or 130 μm or less.

[0081] The positive electrode active material layer (120) may have an appropriate thickness. Although not specifically limited, for example, the thickness of the positive electrode active material layer (120) is 22 ㎛ or more, 30 ㎛ or more, 31 ㎛ or more, 32 ㎛ or more, 33 ㎛ or more, 34 ㎛ or more, 35 ㎛ or more, 36 ㎛ or more, 37 ㎛ or more, 38 ㎛ or more, 39 ㎛ or more, 40 ㎛ or more, 41 ㎛ or more, 42 ㎛ or more, 43 ㎛ or more, 44 ㎛ or more, 45 ㎛ or more, 46 ㎛ or more, 47 ㎛ or more, 48 ㎛ or more, 49 ㎛ or more, or 50 ㎛ or more, or 130 ㎛ or less, 125 ㎛ or less, 120 ㎛ or less, 115 ㎛ or less, 110 ㎛ or less, 105 ㎛ or less, 100 ㎛ or less, 95 ㎛ or less, 90 It may be ㎛ or less, 85 ㎛ or less, or 80 ㎛ or less. The thickness of the positive electrode active material layer (120) may be within a range formed by appropriately selecting the upper and lower limits described above.

[0082] Referring to FIG. 1, in an all-solid-state battery (10) according to one aspect of the present disclosure, the negative electrode (200) may include a negative electrode current collector (210) and a negative electrode active material layer (220). The negative electrode active material layer (220) may be positioned on one or both sides of the negative electrode current collector (210).

[0083] Referring to FIG. 1, in an all-solid-state battery (10) according to one aspect of the present disclosure, a negative electrode current collector (210) may be a plate structure, a foil structure, or a carbon-coated foil structure made of copper (Cu), aluminum (Al), indium (In), magnesium (Mg), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), germanium (Ge), lithium (Li), or an alloy thereof. The negative electrode current collector (210) may be a foil structure containing copper. The negative electrode current collector (210) may have an appropriate thickness, for example, may have a thickness within a range of 1 μm to 30 μm.

[0084] Referring to FIG. 1, in an all-solid-state battery (10) according to one aspect of the present disclosure, the negative electrode active material layer (220) may include a negative electrode active material. The negative electrode active material is not particularly limited as long as it is used in the art, and may include, for example, one or more selected from the group consisting of carbonaceous materials and alloy-forming elements that form an alloy or compound with lithium through an electrochemical reaction during charging. The carbonaceous material may include one or more selected from the group consisting of graphite, carbon black, and graphene. The carbon black may include, for example, acetylene black, furnace black, and ketchen black. The alloy-forming elements may include, for example, one or more selected from the group consisting of gold, platinum, palladium, silicon, silver, aluminum, bismuth, tin, and zinc. Meanwhile, the negative electrode active material may further include a silicon-based compound. The silicon-based compound may include, for example, one or more selected from the group consisting of silicon (Si), silicon oxide, and silicon carbide. In addition, the silicon-based compound may be doped with a metal or may not be doped, depending on the case. The doping metal may include, for example, one or more selected from the group consisting of lithium (Li), magnesium (Mg), calcium (Ca), iron (Fe), titanium (Ti), vanadium (V), and aluminum (Al).

[0085] In addition, the negative electrode active material layer (220) may include a negative electrode binder. The negative electrode binder may include a material that can increase the internal bonding strength of the negative electrode active material layer (220) and improve the adhesive strength with the negative electrode current collector (210). The above-mentioned negative electrode binder is not particularly limited as long as it is used in the art, and may include, for example, one or more selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene (PVDF-co-HFP), polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), styrene butadiene rubber (SBR), butadiene rubber (BR), acrylonitrile-butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), and polyethylene oxide (PEO).

[0086] In addition, the negative electrode active material layer (220) may contain a negative electrode active material and a negative electrode binder in an appropriate ratio. The negative electrode active material layer (220) may contain a negative electrode binder in an amount of 0.1 to 10 parts by weight relative to 100 parts by weight of the negative electrode active material. When the negative electrode active material layer (220) contains a negative electrode active material and a negative electrode binder in a combined state as described above, the internal bonding force can be increased and the adhesive force with the negative electrode current collector (210) can be improved, thereby ensuring stability and securing excellent energy capacity.

[0087] In addition, the negative active material layer (220) may include a conductive material. The conductive material may include a material that can enhance conductivity and / or mobility of lithium ions or electrons. The conductive material is not particularly limited as long as it is used in the art, and may include, for example, one or more selected from the group consisting of carbon-based conductive materials such as graphite, carbon black, and carbon nanotubes, and metal-based conductive materials such as tin, tin oxide, titanium oxide, LaSrCoO3, and LaSrMnO3.

[0088] In addition, the negative electrode active material layer (220) may contain a negative electrode active material and a conductive material in an appropriate ratio. The negative electrode active material layer (220) may contain a conductive material in an amount of about 0.1 to 10 parts by weight relative to 100 parts by weight of the negative electrode active material. When the negative electrode active material layer (220) contains a negative electrode active material and a conductive material in a combined state as described above, it can provide better conductivity and secure excellent energy capacity.

[0089] In addition, the negative electrode active material layer (220) may include an electrolyte as described above. The electrolyte of the same type as the electrolyte included in the negative electrode active material layer (220) may be included in the electrolyte layer (30). In addition, the electrolyte included in the negative electrode active material layer (220) may include at least one selected from the group consisting of a polymer electrolyte, an oxide electrolyte, and a sulfide electrolyte. The electrolyte included in the negative electrode active material layer (220) may refer to the contents described in the electrolyte layer (30) described below.

[0090] In addition, the negative electrode active material layer (220) may contain the negative electrode active material and the electrolyte in an appropriate ratio. The negative electrode active material layer (220) may contain the electrolyte in an amount of about 1 to 100 parts by weight relative to 100 parts by weight of the negative electrode active material. If the negative electrode active material layer (220) contains the negative electrode active material and the electrolyte in a combined state as described above, it may provide better ionic conductivity.

[0091] In addition, the negative active material layer (220) may include one or more additives selected from the group consisting of a thickener, a filler, a dispersant, and an ion conductor, as needed.

[0092] In addition, the negative electrode active material layer (220) may be formed from a negative electrode active material slurry composition. Specifically, the negative electrode active material layer (220) may be formed through a step of applying the negative electrode active material slurry composition onto a negative electrode current collector (210) and then drying it. In the present disclosure, the negative electrode active material layer (220) may refer to the negative electrode active material slurry composition dried as described above.

[0093] The negative active material slurry composition capable of forming the above-described negative active material layer (220) may include the above-described negative active material, negative electrode binder, conductive material, etc. In addition, the negative active material slurry composition may include a solvent to ensure appropriate processability. The solvent may be determined according to the negative active material or negative electrode binder included in the negative active material slurry composition, and is not particularly limited as long as it is used in the art. The solvent may include, for example, a non-polar solvent, a low-polarity solvent, or a combination thereof. For example, the organic solvent is not particularly limited, but may include, but is not limited to, a tertiary amine solvent such as triethylamine; an ester solvent such as butyl butyrate; an aromatic solvent such as benzene, toluene, xylene, methoxybenzene, and anisole; It may include at least one selected from the group consisting of chain-like aliphatic solvents such as hexane, heptane, octane, nonane, and decane, and cyclic aliphatic solvents such as cycloheptane.

[0094] In addition, in the step of drying after applying the negative active material slurry composition, the drying may refer to a process of removing the solvent included in the negative active material composition so that the negative active material layer (220) includes 1 wt% or less, 0.5 wt% or less, or 0.1 wt% or less of the solvent relative to the total weight. In addition, the method of applying the negative active material slurry composition may be performed according to a known method, and may be performed, for example, by a method using a slot die, a doctor blade method, a dip method, a reverse roll method, a direct roll method, a gravure method, an extrusion method or a brushing method. In addition, the negative active material slurry composition may be applied in an appropriate loading amount in consideration of the thickness of the desired negative active material layer (220). Meanwhile, the negative active material layer (220) may be rolled for miniaturization and higher energy density. The above rolling can be performed in a known manner, for example, through a rolling jig.

[0095] The above-described negative active material layer (220) may be in a state in which the negative active material slurry composition is dried as described above and the solvent is removed due to the drying. Here, the state in which the solvent is removed may mean that the solvent is included in an amount of 1 wt% or less, 0.5 wt% or less, or 0.1 wt% or less relative to the total weight of the negative active material layer (220), or that the solvent is not included.

[0096] Referring to FIG. 1, in an all-solid-state battery (10) according to one aspect of the present disclosure, the negative electrode active material layer (220) may have an appropriate thickness. Although not specifically limited, for example, the thickness of the negative electrode active material layer (220) is 22 ㎛ or more, 30 ㎛ or more, 31 ㎛ or more, 32 ㎛ or more, 33 ㎛ or more, 34 ㎛ or more, 35 ㎛ or more, 36 ㎛ or more, 37 ㎛ or more, 38 ㎛ or more, 39 ㎛ or more, 40 ㎛ or more, 41 ㎛ or more, 42 ㎛ or more, 43 ㎛ or more, 44 ㎛ or more, 45 ㎛ or more, 46 ㎛ or more, 47 ㎛ or more, 48 ㎛ or more, 49 ㎛ or more, or 50 ㎛ or more, or 130 ㎛ or less, 125 ㎛ or less, 120 ㎛ or less, 115 ㎛ or less, 110 ㎛ or less, 105 ㎛ or less, 100 ㎛ or less, 95 ㎛ or less, 90 It may be ㎛ or less, 85 ㎛ or less, or 80 ㎛ or less. The thickness of the negative active material layer (220) may be within a range formed by appropriately selecting the upper and lower limits described above.

[0097] Referring to FIG. 1, an all-solid-state battery (10) according to one aspect of the present disclosure may include an electrolyte layer (30) as described above. The electrolyte layer (30) may include an electrolyte. The electrolyte may include a solid electrolyte that is solid at room temperature.

[0098] The above electrolyte layer (30) may include at least one selected from the group consisting of a polymer electrolyte, an oxide electrolyte, and a sulfide electrolyte. Here, the polymer electrolyte, the oxide electrolyte, and the sulfide electrolyte may be, for example, a solid electrolyte that is solid at room temperature.

[0099] Meanwhile, the electrolyte layer (30) may have a single-layer structure or a multi-layer structure. If the electrolyte layer (30) has a multi-layer structure, the types and content ratios of the electrolyte and electrolyte binder included in each layer may also be configured independently.

[0100] The polymer electrolyte may include at least one selected from the group consisting of a solid polymer electrolyte and a polymer gel electrolyte. The solid polymer electrolyte may be formed by adding a resin to a solvated lithium salt, respectively. The polymer gel electrolyte may be formed by incorporating an organic electrolyte solution containing an organic solvent and a lithium salt into a resin.

[0101] The above solid polymer electrolyte may not be particularly limited as long as it is an ion-conducting material used in the art, and may include, for example, one or more selected from the group consisting of polyether polymers, polycarbonate polymers, acrylate polymers, polysiloxane polymers, phosphazene polymers, polyethylene oxide, polyethylene derivatives, alkylene oxide derivatives, phosphoric acid ester polymers, polyazation lysine, polyester sulfide, polyvinyl alcohol, and polyvinylidene fluoride. However, this is merely an example.

[0102] The polymer gel electrolyte may not be particularly limited as long as it is a material that contains an organic electrolyte containing a lithium salt in a resin and is used in the art, and for example, the resin may include at least one selected from the group consisting of polyvinylchloride (PVC) resin, polymethyl methacrylate (PMMA) resin, polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP). However, this is only an example.

[0103] The above oxide-based electrolyte may be a compound containing oxygen atoms (O), having ionic conductivity of a metal belonging to Group 1 or Group 2 of the periodic table, and having electronic insulating properties.

[0104] The above oxide electrolyte is not particularly limited as long as it is used in the art, but for example, a garnet-type oxide electrolyte (e.g., LLZO), a perovskite-type oxide electrolyte (e.g., Li0 . 5La0 . 5TiO3), NASICON (Natrium super ionic conductor) type oxide electrolyte (e.g., LiTi2P3O 12 , Li 1+xh+yh (Al, Ga) xh (Ti, Ge)2 - xh Si yh P3 - yh O 12 (where 0≤xh≤1, 0≤yh≤1)) and LISICON (Lithium super ionic conductor) type oxide electrolyte (e.g., Li 3.5 Zn 0.25 It may include one or more selected from the group consisting of GeO4). However, this is only an example.

[0105] The above sulfide-based electrolyte may be a compound containing sulfur atoms (S), having ionic conductivity of a metal belonging to Group 1 or Group 2 of the periodic table, and having electronic insulating properties. The above sulfide-based electrolyte may contain at least lithium (Li) and sulfur (S), and may further contain phosphorus (P) or other elements as needed.

[0106] The above sulfide-based electrolyte is not particularly limited as long as it is used in the art, but for example, Li6PS5Cl, Li2S-P2S5, Li2S-P2S5-LiCl, Li2S-P2S5-H2S, Li2S-P2S5-H2S-LiCl, Li2S-LiI-P2S5, Li2S-LiI-Li2O-P2S5, Li2S-LiBr-P2S5, Li2S-Li2O-P2S5, Li2S-Li3PO4-P2S5, Li2S-P2S5-P2O5, Li2S-P2S5-SiS2, Li2S-P2S5-SiS2-LiCl, Li2S-P2S5-SnS, Li2S-P2S5-Al2S3, Li2S-GeS2, Li2S-GeS2-ZnS, Li2S-Ga2S3, Li2S-GeS2-Ga2S3, Li2S-GeS2-P2S5, Li2S-GeS2-Sb2S5, Li2S-GeS2-Al2S3, Li2S-SiS2, Li2S-Al2S3, Li2S-SiS2-Al2S3, Li2S-SiS2-P2S5, Li2S-SiS2-P2S5-LiI, Li2S-SiS2-LiI, Li2S-SiS2-Li4SiO4, Li2S-SiS2-Li3PO4, and Li 10 GeP2S 12 It may include one or more selected from the group consisting of . However, this is only an example.

[0107] The above sulfide-based electrolyte can be synthesized using an amorphization method, for example, a mechanical milling method, a solution method, or a melt quenching method. A specific synthesis method known in the art can be applied.

[0108] The electrolyte layer (30) according to one aspect of the present disclosure may include an electrolyte in a range of 90 wt% to 100 wt% relative to the total weight of the electrolyte layer (30).

[0109] The electrolyte layer (30) may include an electrolyte binder to secure bonding strength between electrolytes and improve adhesive strength with the electrode (20). The electrolyte binder may include a binder included in the active material layer (120, 220) of the electrode (20). The electrolyte binder is not particularly limited as long as it is used in the art, and examples thereof include polytetrafluoroethylene, polyethylene oxide, polyethyleneglycol, polyacrylonitrile, polyvinylchloride, polymethylmethacrylate, polypropyleneoxide, polyphosphazene, polysiloxane, polydimethylsiloxane, polyvinylidenefluoride, polyvinylidenefluoride-hexafluoropropylene copolymer (PVDF-HFP), polyvinylidenefluoride-chlorotrifluoroethylene copolymer (PVDF-CTFE), polyvinylidenefluoride-tetrafluoroethylene copolymer (PVDF-TFE), It may include at least one selected from the group consisting of polyvinylidenecarbonate, polyvinylpyrrolidinone, styrene-butadiene rubber, nitrile-butadiene rubber, hydrogenated nitrile butadiene rubber, and butadiene rubber. However, this is only an example.

[0110] The electrolyte layer (30) according to one aspect of the present disclosure may include an electrolyte binder in a range of 0.1 to 10 parts by weight relative to 100 parts by weight of the electrolyte.

[0111] In addition, the electrolyte layer (30) may be formed using an electrolyte layer slurry composition. Specifically, the electrolyte layer (30) may be formed by directly applying the electrolyte layer slurry composition to the electrode (20) or applying it to a release film or the like and then drying it. In the present disclosure, the electrolyte layer (30) may refer to the electrolyte layer slurry composition dried as described above. In addition, the method for forming the electrolyte layer (30) is not particularly limited to the above method, and any method applicable in the art may be used.

[0112] The electrolyte layer slurry composition capable of forming the above-described electrolyte layer (30) may include the aforementioned electrolyte and electrolyte binder, etc. In addition, the electrolyte layer slurry composition may include a solvent for forming an electrolyte layer to ensure appropriate processability. The solvent for forming the electrolyte layer may be determined according to the electrolyte or the electrolyte binder, etc., and is not particularly limited as long as it is used in the art. The solvent for forming the electrolyte layer may include a non-polar solvent, a low-polarity solvent, or a combination thereof, which has low reactivity with the electrolyte and no or very small intramolecular dipole moment. For example, the organic solvent is not particularly limited, but may include a tertiary amine solvent such as triethylamine; an ester solvent such as butyl butyrate; an aromatic solvent such as benzene, toluene, xylene, methoxybenzene, and anisole; It may include at least one selected from the group consisting of chain-like aliphatic solvents such as hexane, heptane, octane, nonane, and decane, and cyclic aliphatic solvents such as cycloheptane.

[0113] In addition, in the step of drying after applying the electrolyte layer slurry composition to an electrode (20) or a release film, the drying may refer to a process of removing the electrolyte layer forming solvent included in the electrolyte layer slurry composition so that the electrolyte layer (30) includes the electrolyte layer forming solvent in an amount of 1 wt% or less, 0.5 wt% or less, or 0.1 wt% or less, relative to the total weight. In addition, the method of applying the electrolyte layer slurry composition is not particularly limited as long as it is a known method used in the art, and the method of applying the positive or negative electrode active material slurry may be referred to above.

[0114] The electrolyte layer (30) may be in a state in which the electrolyte layer slurry composition is dried as described above, and the solvent for forming the electrolyte layer is removed due to the drying. Here, the state in which the solvent for forming the electrolyte layer is removed may mean that the solvent for forming the electrolyte layer is included in an amount of 1 wt% or less, 0.5 wt% or less, or 0.1 wt% or less relative to the total weight of the electrolyte layer (30), or that the solvent for forming the electrolyte layer is not included.

[0115] In an all-solid-state battery (10) according to one aspect of the present disclosure, at least one electrode (100 or 200) and an electrolyte layer (30) may be in close contact with each other by being pressurized at a specific range of pressure. A specific range of pressure (also called forming pressure) applied so that the electrode (100, 200) and the electrolyte layer (30) are in close contact may be 200 MPa or more, 210 MPa or more, 220 MPa or more, 230 MPa or more, 240 MPa or more, 250 MPa or more, 260 MPa or more, 270 MPa or more, 280 MPa or more, 290 MPa or more, or 300 MPa or more, or 700 MPa or less, 690 MPa or less, 680 MPa or less, 670 MPa or less, 660 MPa or less, 650 MPa or less, 640 MPa or less, 630 MPa or less, 620 MPa or less, 610 MPa or less, or 600 MPa or less. The pressure may be within a range formed by appropriately selecting the above-mentioned upper and lower limits. When the above pressure satisfies the above-described range, the active material, conductive binder, and electrolyte included in the electrode (100, 200) can be in close contact with each other to form a dense structure, and the electrolyte and electrolyte binder included in the electrolyte layer (30) can be in close contact with each other to form a dense structure. As will be described later, when the electrode (100, 200) and the electrolyte layer (30) are brought into close contact with each other at a forming pressure within the above range, even when the bonding force is measured at a relatively high speed, the measured bonding force value has little deviation, so that high reproducibility can be secured.

[0116] In an all-solid-state battery (10) according to one aspect of the present disclosure, an active material layer (120, 220) and an electrolyte layer (30) of at least one electrode (100, 200) may be in close contact with each other by being pressed at a specific range of pressure. A specific range of pressure (also referred to as forming pressure) applied so that the active material layer (120, 220) and the electrolyte layer (30) are in close contact may be 200 MPa or more, 210 MPa or more, 220 MPa or more, 230 MPa or more, 240 MPa or more, 250 MPa or more, 260 MPa or more, 270 MPa or more, 280 MPa or more, 290 MPa or more, or 300 MPa or more, or 700 MPa or less, 690 MPa or less, 680 MPa or less, 670 MPa or less, 660 MPa or less, 650 MPa or less, 640 MPa or less, 630 MPa or less, 620 MPa or less, 610 MPa or less, or 600 MPa or less. The pressure may be within a range formed by appropriately selecting the above-mentioned upper and lower limits. When the pressure satisfies the above-described range, the active material, conductive material, binder, and electrolyte included in the active material layer (120, 220) can be in close contact with each other to form a dense structure, and the electrolyte and electrolyte binder included in the electrolyte layer (30) can be in close contact with each other to form a dense structure. As will be described later, when the molding pressure within the above range causes the active material layer (120, 220) and the electrolyte layer (30) to be in close contact with each other, even when the bonding force is measured at a relatively high speed, the measured bonding force value has a small deviation, so that high reproducibility can be secured. In addition, when the active material layer (120, 220) and the electrolyte layer (30) of the all-solid-state battery according to the present disclosure are pressed and brought into close contact with a pressure satisfying the above range, the active material layer (120, 220) can have high membrane strength, and an all-solid-state battery having excellent charge / discharge capacity can be realized.

[0117] Meanwhile, in an all-solid-state battery (10) according to one aspect of the present disclosure, the active material layer (120, 220) of at least one electrode (100, 200) can be rolled at a pressure in a specific range. The above active material layers (120, 220) can be independently rolled at a pressure of 200 MPa or more, 210 MPa or more, 220 MPa or more, 230 MPa or more, 240 MPa or more, 250 MPa or more, 260 MPa or more, 270 MPa or more, 280 MPa or more, 290 MPa or more, or 300 MPa or more, or 700 MPa or less, 690 MPa or less, 680 MPa or less, 670 MPa or less, 660 MPa or less, 650 MPa or less, 640 MPa or less, 630 MPa or less, 620 MPa or less, 610 MPa or less, or 600 MPa or less. The rolling pressure can be within a range formed by appropriately selecting the above-mentioned upper and lower limits. When the above rolling pressure satisfies the above-described range, the active material, conductive material, binder, and electrolyte included in the active material layer (120, 220) can adhere to each other to form a dense structure. Through this, the active material layer (120, 220) can have improved film strength, and thus the all-solid-state battery including the active material layer (120, 220) can have excellent electrochemical performance. In addition, even when the bonding force of the active material layer (120, 220) is measured at a relatively high speed, the measured bonding force value has little deviation, so that high reproducibility can be secured.

[0118] An all-solid-state battery (10) according to one aspect of the present disclosure is S according to the following Equation 1 dR1 This can be 1 or more, 1.1 or more, 1.2 or more, 1.3 or more, 1.4 or more, 1.5 or more, 1.6 or more, 1.7 or more, 1.8 or more, 1.9 or more, or 2 or more. S according to the following formula 1 dR1The upper limit of is not particularly limited, but may be, for example, 10 or less, 9.5 or less, 9 or less, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, 5.5 or less, or 5 or less. S according to the following formula 1 dR1 can have a value within a range greater than or equal to the aforementioned lower limit or less than or equal to the aforementioned upper limit.

[0119] S according to the following formula 1 dR1 When the value satisfies the above-mentioned range, the all-solid-state battery may have excellent electrochemical performance. In addition, it may have excellent charging capacity and excellent charge-discharge characteristics.

[0120] Also, S according to the following formula 1 dR1 When the value of satisfies the above-mentioned range, the film strength of the electrode active material layer is high, so that it can have excellent charging capacity and charge / discharge characteristics. In addition, according to the following equation 1, S dR1 When the value satisfies the above-mentioned range, an active material layer having a dense structure can be implemented, and accordingly, the all-solid-state battery can have excellent charging capacity and charge / discharge characteristics. In addition, even when the bonding force is measured at a relatively high speed, the measured bonding force value has little deviation, so high reproducibility can be secured.

[0121] [Formula 1]

[0122] S dR1 =S d2 ,0.2 / S d5 ,0.5

[0123] In the above formula 1, S d2 ,0.2 is the standard deviation of the bonding force of the active material layer (120, 220) measured three times by cutting at an inclined speed of 2 ㎛ / s in the horizontal direction and 0.2 ㎛ / s in the vertical direction from the surface of the active material layer (120, 220), and S d5 ,0.5is the standard deviation of the bonding force of the active material layer (120, 220) measured three times repeatedly by cutting at an inclined speed of 5 ㎛ / s in the horizontal direction and 0.5 ㎛ / s in the vertical direction from the surface of the active material layer (120, 220). Meanwhile, when measuring the bonding force of the active material layer (120, 220), the measurement was made while maintaining the horizontal speed during the inclined cutting.

[0124] Meanwhile, the all-solid-state battery (10) according to one aspect of the present disclosure forms a dense structure by closely contacting the components within the active material layer (120, 220) with a molding pressure within the above range, as described above, thereby forming S according to the above formula 1. dR1 can be controlled within the aforementioned range. In addition, by controlling the type and content of the active material, conductive material, binder, solvent, etc. used in the production of the active material layer or controlling the loading amount or dispersibility of the slurry for the production of the active material layer, S according to the above formula 1 dR1 The bonding force can be controlled within the aforementioned range, but is not limited thereto.

[0125] In the all-solid-state battery (10) according to one aspect of the present disclosure, the active material layer (120, 220) may be a positive electrode active material layer (120). In this case, S according to the above formula 1 d5 ,0.5 may be 0.02 or less, 0.019 or less, or 0.018 or less. The above S d5 , 0.5 The closer it is to 0, the better the physical property value is, and the lower limit is not specifically set, and it can be 0 or more, more than 0, or 0.001 or more. When the active material layer (120, 220) is a positive electrode active material layer (120), S according to Equation 1 d5,0.5If the range is as described above, the all-solid-state battery including the positive electrode active material layer (120) can have improved electrochemical performance, and even if the binding force is measured at a relatively high speed, the measured binding force value has little deviation, so high reproducibility can be secured.

[0126] In an all-solid-state battery (10) according to one aspect of the present disclosure, the active material layer (120, 220) may be a negative electrode active material layer (220). In this case, S according to the above formula 1 d5 ,0.5 may be 0.02 or less, 0.019 or less, 0.018 or less, 0.017 or less, 0.016 or less, 0.015 or less, 0.014 or less, 0.013 or less, 0.012 or less, 0.011 or less, 0.009 or less, 0.008 or less, 0.007 or less, 0.006 or less, 0.005 or less, or 0.004 or less. The above S d5 , 0.5 The closer it is to 0, the better the physical property value is, and the lower limit is not specifically set, and it can be 0 or more, greater than 0, or 0.0001 or more. When the active material layer (120, 220) is a negative electrode active material layer (220), S according to Equation 1 d5 ,0.5 If the range is as described above, the charge / discharge performance of the all-solid-state battery including the negative active material layer (220) can be improved, and even if the bonding force is measured at a relatively high speed, the measured bonding force value has little deviation, so high reproducibility can be secured.

[0127] An all-solid-state battery (10) according to one aspect of the present disclosure is S according to the following formula 1A dR1AThis can be 1 or more, 1.1 or more, 1.2 or more, 1.3 or more, 1.4 or more, 1.5 or more, 1.6 or more, 1.7 or more, 1.8 or more, 1.9 or more, 2 or more, 2.1 or more, 2.2 or more, 2.3 or more, 2.4 or more, 2.5 or more, 2.6 or more, 2.7 or more, 2.8 or more, 2.9 or more, 3 or more, 3.1 or more, 3.2 or more, or 3.3 or more. S according to the following formula 1A dR1A The upper limit of is not particularly limited, but may be, for example, 10 or less, 9.5 or less, 9 or less, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, 5.5 or less, or 5 or less. S according to the following formula 1A dR1A can have a value within a range greater than or equal to the lower limit or less than or equal to the upper limit as described above. S according to the following Equation 1A dR1A When the value satisfies the above-mentioned range, the positive electrode active material layer of the all-solid-state battery can have excellent film strength and secure improved charging capacity. In addition, even when the bonding force is measured at a relatively high speed, the measured bonding force value has little deviation, so high reproducibility can be secured.

[0128] [Formula 1A]

[0129] S dR1A =S dA2,0.2 / S dA5,0.5

[0130] In the above formula 1A, S dA2 ,0.2 is the standard deviation of the bonding force of the positive electrode active material layer (120) measured three times by cutting at an inclined speed of 2 µm / s in the horizontal direction and 0.2 µm / s in the vertical direction from the surface of the positive electrode active material layer (120), and S dA5 ,0.5 is the standard deviation of the bonding force of the positive electrode active material layer (120) measured three times by cutting at an inclined speed of 5 µm / s in the horizontal direction and 0.5 µm / s in the vertical direction from the surface of the positive electrode active material layer (120).

[0131] Meanwhile, the all-solid-state battery (10) according to one aspect of the present disclosure forms a dense structure by closely contacting the components within the positive electrode active material layer (120) with a molding pressure within the above range, as described above, thereby forming S according to the above formula 1A. dR1A can be controlled within the aforementioned range. In addition, by controlling the type and content of the active material, conductive material, binder, solvent, etc. used in the production of the active material layer or controlling the loading amount or dispersibility of the slurry for the production of the active material layer, S according to the above formula 1 dR1 The bonding force can be controlled within the aforementioned range, but is not limited thereto.

[0132] In an all-solid-state battery (10) according to one aspect of the present disclosure, S according to the above formula 1A dA5,0.5 may be 0.02 or less, 0.019 or less, or 0.018 or less. The above S dA5 , 0.5 The closer it is to 0, the better the property value is, and the lower limit is not specifically set, and it can be 0 or more, greater than 0, or 0.001 or more. S according to the above formula 1A dA5 ,0.5 If the range is as described above, the all-solid-state battery including the positive electrode active material layer can have excellent electrochemical performance, and even if the binding force is measured at a relatively high speed, the measured binding force value has little deviation, so high reproducibility can be secured.

[0133] An all-solid-state battery (10) according to one aspect of the present disclosure is S according to the following formula 1B dR1B This can be 1 or more, 1.1 or more, 1.2 or more, 1.3 or more, 1.4 or more, 1.5 or more, 1.6 or more, 1.7 or more, 1.8 or more, 1.9 or more, 2 or more, or 2.1 or more. S according to the following formula 1B dR1BThe upper limit of is not particularly limited, but may be, for example, 10 or less, 9.5 or less, 9 or less, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, 5.5 or less, 5 or less, 4.5 or less, or 4 or less. S according to the following formula 1B dR1B can have a value within a range greater than or equal to the lower limit or less than or equal to the upper limit as described above. S according to the following formula 1B dR1B As described above, the negative active material layer of the all-solid-state battery can have a dense tissue structure, thereby realizing high charging capacity. In addition, even when the bonding force is measured at a relatively high speed, the measured bonding force value has little deviation, thereby ensuring high reproducibility.

[0134] [Formula 1B]

[0135] S dR1B =S dB2,0.2 / S dB5,0.5

[0136] In the above formula 1B, S dB2 ,0.2 is the standard deviation of the bonding force of the negative electrode active material layer (220) measured three times by cutting at an inclined speed of 2 µm / s in the horizontal direction and 0.2 µm / s in the vertical direction from the surface of the negative electrode active material layer (220), and S dB5 ,0.5 is the standard deviation of the bonding force of the negative electrode active material layer (220) measured three times by cutting at an inclined speed of 5 µm / s in the horizontal direction and 0.5 µm / s in the vertical direction from the surface of the negative electrode active material layer (220).

[0137] Meanwhile, the all-solid-state battery (10) according to one aspect of the present disclosure forms a dense structure by closely contacting the components within the negative active material layer (220) with a molding pressure within the above range, as described above, thereby forming S according to the above formula 1B. dR1B can be controlled within the aforementioned range, but is not limited thereto.

[0138] In an all-solid-state battery (10) according to one aspect of the present disclosure, S according to the above formula 1B dB5,0.5 may be 0.02 or less, 0.019 or less, 0.018 or less, 0.017 or less, 0.016 or less, 0.015 or less, 0.014 or less, 0.013 or less, 0.012 or less, 0.011 or less, 0.009 or less, 0.008 or less, 0.007 or less, 0.006 or less, 0.005 or less, or 0.004 or less. The above S dB5 , 0.5 The closer it is to 0, the better the physical property value is, and the lower limit is not specifically set, and it can be 0 or more, greater than 0, or 0.0001 or more. S according to the above formula 1B dB5 ,0.5 If the range is as described above, the all-solid-state battery including the negative active material layer can have improved electrochemical performance, and even if the binding force is measured at a relatively high speed, the measured binding force value has little deviation, so high reproducibility can be secured.

[0139] An all-solid-state battery (10) according to one aspect of the present disclosure has R according to the following formula 1C AB R can be 1 or more, 1.1 or more, 1.2 or more, 1.3 or more, 1.4 or more, or 1.5 or more. R according to the following formula 1C AB of The upper limit is not particularly limited, but can be, for example, 10 or less, 9.5 or less, 9 or less, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, 5.5 or less, or 5 or less. R according to the following formula 1C AB can have a value within a range greater than or equal to the aforementioned lower limit or less than or equal to the upper limit. R according to the following formula 1C ABIf the value satisfies the above-mentioned range, an all-solid-state battery with excellent charge / discharge performance can be implemented, and even if the bonding force is measured at a relatively high speed, the measured bonding force value has little deviation, so high reproducibility can be secured.

[0140] [Formula 1C]

[0141] R AB =S dR1A / S dR1B

[0142] In the above formula 1C, S dR1A is as defined in the above formula 1A, and S dR1B is as defined in the above formula 1B.

[0143] FIGS. 2 to 5 are schematic diagrams illustrating a process of cutting at least a portion of an all-solid-state battery (10) using a cutting device (40) according to an embodiment of the present disclosure. At least a portion of the all-solid-state battery (10) can be cut using the cutting device (40), and the bonding force for an active material layer of an electrode can be measured through the cutting device (40). The cutting device (40) is not particularly limited as long as it includes a blade (41) and can measure the bonding force while performing cutting using the blade, but may be, for example, a SAICAS (surface and interfacial cutting analysis systems). The SAICAS may include a blade (41). The cutting device (40) shown in FIGS. 2 to 5 may be at least a portion adjacent to the blade (41).

[0144] Referring to FIGS. 2 to 5, the cutting device (40) can slant-cut the electrode (100, 200) of the all-solid-state battery (10). In addition, referring specifically to FIGS. 2 to 5, the cutting device (40) can slant-cut the active material layer (120, 220) of the electrode (20). In addition, the cutting device (40) can slant-cut the current collector (110, 210). In addition, the cutting device (40) can slant-cut the electrolyte layer (30).

[0145] Referring to FIGS. 2 to 5, the cutting device (40) may be configured to move. The cutting device (40) may move in a horizontal direction (e.g., x-axis direction). In addition, the cutting device (40) may move in a vertical direction (e.g., y-axis direction). In the above, the vertical direction may refer to a direction in which gravity acts. In addition, the horizontal direction may refer to a direction rotated 90 degrees from the vertical direction. Referring to FIGS. 2 to 5, the y-axis direction may be referred to as a vertical direction, and the x-axis direction may be referred to as a horizontal direction.

[0146] Referring to FIGS. 2 to 5, the cutting device (40) can move in the horizontal direction and the vertical direction simultaneously, and the speed of moving in the horizontal direction (horizontal speed, Vx) and the speed of moving in the vertical direction (vertical speed, Vy) can be independent of each other. The cutting device (40) can perform an inclined cutting of at least a portion of the all-solid-state battery (10) by moving in the horizontal direction and the vertical direction simultaneously. That is, the cutting device (40) moves in the horizontal direction and the vertical direction simultaneously, so that it actually moves in the direction according to the vector sum, and thus, as described above, it can perform an inclined cutting of at least a portion of the all-solid-state battery (10). Meanwhile, in the cutting device (40), the speed of moving in the horizontal direction during inclined cutting (horizontal speed, V x) and the velocity moving in the vertical direction (vertical velocity, V y ) can be predetermined. In addition, the cutting device (40) can be configured to have a predetermined horizontal speed (V x ) and vertical velocity (V y ) can maintain its value while cutting the slope. That is, the cutting device (40) has a predetermined horizontal speed (V x ) and vertical velocity (V y ) can be used to perform slope cutting. In addition, specifically, the horizontal speed (V x ) and vertical velocity (V y ) may refer to the speed of the blade (41) of the cutting device (40).

[0147] FIG. 2 is a drawing schematically illustrating a process in which a cutting device (40) cuts at least a portion of an anode (100). In addition, FIG. 3 is a drawing schematically illustrating a process in which a cutting device (40) cuts at least a portion of a cathode (200).

[0148] Referring to FIGS. 2 and 3, in the present specification, inclined cutting may mean that the cutting device (40) moves simultaneously in the horizontal and vertical directions to cut while forming an angle (cutting inclination, θ) in the direction in which the blade (41) faces with respect to one surface of the active material layer (120, 220).

[0149] Referring to FIGS. 2 and 3, the cutting device (40) can move horizontally and vertically from the surface of the active material layer (120, 220) simultaneously, and the blade (41) can cut the active material layer (120, 220) at the cutting inclination (θ). Referring to FIGS. 2 and 3, the cutting device (40) is positioned at a higher position (above) than the electrode (20), and the cutting device (40) can move horizontally in the +x direction and vertically in the -y direction simultaneously. Here, the -y direction may mean the direction in which gravity acts. In addition, the higher position may mean being at a +y position with respect to the +y direction.

[0150] Referring to FIGS. 2 and 3, the cutting inclination (θ) may be 2.5 degrees or more, 2.6 degrees or more, 2.7 degrees or more, 2.8 degrees or more, 2.9 degrees or more, or 3 degrees or less, 6 degrees or less, 5.9 degrees or less, 5.8 degrees or less, 5.7 degrees or less, 5.6 degrees or less, or 5.5 degrees or less. In addition, the cutting inclination (θ) may be within a range formed by appropriately selecting the upper and lower limits described above. In addition, when the cutting inclination (θ) satisfies the above-described range, it may be more suitable for measuring the bonding force.

[0151] In an all-solid-state battery (10) according to one aspect of the present disclosure, in the above formula 1, S d2 ,0.2 and S d5 ,0.5 can be measured by cutting with a cutting inclination (θ) that is independently 2.5 degrees or more, 2.6 degrees or more, 2.7 degrees or more, 2.8 degrees or more, 2.9 degrees or more, or 3 degrees or less, 6 degrees or less, 5.9 degrees or less, 5.8 degrees or less, 5.7 degrees or less, 5.6 degrees or less, or 5.5 degrees or less. Specifically, in the above formula 1, S d2 ,0.2 and S d5,0.5 may be the standard deviation of the bonding force of the active material layer (120, 220) measured three times by independently performing an inclined cutting with a cutting slope (θ) within the aforementioned range. The inclined cutting may be performed by a cutting device (40).

[0152] S in the above formula 1A dA2 ,0.2 and S dA5 , 0.5 Of course, S in the above formula 1B dB2 ,0.2 and S dB5 ,0.5 Each of the above can be independently measured by cutting with a cutting slope (θ) within the aforementioned range. Specifically, S of the above formula 1A dA2 ,0.2 and S dA5 , 0.5 may be the standard deviation of the bonding force of the positive electrode active material layer (120) measured three times by cutting with an angle (θ) within the aforementioned range independently. S of the above formula 1B dB2 ,0.2 and S dB5 , 0.5 may be the standard deviation of the bonding force of the negative active material layer (220) measured three times repeatedly by cutting at an angle (θ) within the aforementioned range independently. The angle cutting may be performed by a cutting device (40).

[0153] Figures 4 and 5 are schematic drawings illustrating a process of cutting a positive electrode (100) using a cutting device (40). The negative electrode (200) is not illustrated separately, but it can be sufficiently understood by those skilled in the art that it will be cut using a similar process by referring to the drawings. Hereinafter, the positive electrode (100) will be described as a representative example, but the same process can also be applied to the negative electrode (200).

[0154] Referring to Fig. 4, the cutting device (40) moves horizontally and vertically from the surface of the positive electrode active material layer (120) simultaneously, and the blade (41) cuts the positive electrode active material layer (120) with the cutting inclination (θ), and a cutting depth (H) suitable for measuring the bonding force C ) can be cut until the cutting depth (H) is reached. C ) may mean the vertical straight distance from the surface of the positive electrode active material layer (120) to the location of the end of the blade (41). Here, the cutting depth (H C ) may be a predetermined value. That is, referring to FIG. 4, the cutting device (40) may be a predetermined cutting depth (H C ) can be angled so that the end of the blade (41) is positioned. This may also be the case for the negative electrode active material layer (220) of the negative electrode (200) as described above.

[0155] Cutting depth (H) suitable for measuring the above bonding force C ) is the total thickness (H) of the positive electrode active material layer (120) from the surface of the positive electrode active material layer (120). T ) may be located at 20% to 80% or 30% to 70% of the cutting depth (H). That is, the cutting depth (H C ) is the total thickness (H) of the positive electrode active material layer (120). T ) and then multiplied by 100 can satisfy the above-mentioned range. This can also be the case for the negative electrode active material layer (220) of the negative electrode (200) as described above. That is, the cutting depth (H) suitable for measuring the bonding force C ) is the total thickness (H) of the active material layer (120, 220) from the surface of the active material layer (120, 220). T ) may be located between 20% and 80% or between 30% and 70%.

[0156] Referring to Fig. 5, the bonding force of the active material layer (120, 220) is increased when the cutting device (40) moves only in the horizontal direction (i.e., the vertical speed is 0) and the cutting depth (H C ) can be measured while the blade (41) located in the active material layer (120, 220) horizontally cuts the inside of the active material layer (120, 220). In addition, the bonding force of the active material layer (120, 220) can be measured when the cutting device (40) cuts the end of the blade (41) at a cutting depth (H C ) until the cutting depth (H) is reached. C ) can be measured while cutting the inside of the active material layer (120, 220) while maintaining the horizontal speed during the inclined cutting.

[0157] Referring to Fig. 5, the bonding force of the positive electrode active material layer (120) is determined by the cutting depth (H C ) is the total thickness (H) of the positive electrode active material layer (120) from the surface of the positive electrode active material layer (120). T ) may be measured at 20% to 80% or 30% to 70% of the negative electrode (200). This may also be the case for the negative electrode active material layer (220) of the negative electrode (200) as described above. That is, the bonding force of the active material layer (120, 220) is the cutting depth (H C ) is the total thickness (H) of the active material layer (120, 220) from the surface of the active material layer (120, 220). T ) may be measured at 20% to 80% or 30% to 70%.

[0158] In the all-solid-state battery (10) according to one aspect of the present disclosure, the bonding force (P) of the active material layer (120, 220) may be measured according to the following mathematical formula 2. In addition, as described above, the bonding force (P) of the active material layer (120, 220) is measured by the cutting depth (H) of the end of the blade (41) by the cutting device (40). C ) until the cutting depth (H) is reached. C) can be measured while cutting the inside of the active material layer (120, 220) while maintaining the horizontal speed during the inclined cutting.

[0159] [Formula 2]

[0160]

[0161] In the above formula 2, F h is the horizontal force (N) applied to the blade (41), and w means the width (mm) of the blade (41). In addition, specifically, the F h is the cutting depth (H C ) may refer to the horizontal force applied to the blade (41) while cutting the inside of the active material layer (120, 220) while maintaining the horizontal speed during the inclined cutting.

[0162] FIG. 6 is a drawing schematically illustrating at least a portion of a cutting device (40) according to one embodiment of the present disclosure. Referring to FIG. 6, the width (w) of the blade (41) may refer to a straight-line distance between the two ends of the blade (41) along the z-axis direction. A horizontal force (Fh) applied to the blade (41) may be measured by a force sensor or the like provided in the cutting device (40). The unit of the horizontal force (Fh) may be N (Newton).

[0163] According to one aspect of the present disclosure, a method for measuring the bonding force within an electrode in an all-solid-state battery (10) while ensuring high reproducibility can be provided. Furthermore, according to one aspect of the present disclosure, a method for more quickly and accurately measuring the thickness of the all-solid-state battery (10) can be provided based on the method for measuring the bonding force.

[0164] In the method for measuring the thickness of an all-solid-state battery (10) according to one aspect of the present disclosure, the structural characteristics of the all-solid-state battery (10) may all be referred to the aforementioned contents. The method for measuring the thickness of the all-solid-state battery (10) may include a step of performing an inclined cutting from the surface of the active material layer (120, 220). The inclined cutting may be performed through the cutting device (40) described above. The contents related to the inclined cutting may all be referred to the aforementioned contents.

[0165] In the thickness measurement method of an all-solid-state battery (10) according to one aspect of the present disclosure, the step of cutting the slope is performed at a horizontal speed (V x ) may be 1 ㎛ / s to 10 ㎛ / s or 2 ㎛ / s to 8 ㎛ / s. In addition, the step of cutting the slope may be performed at a vertical velocity (V y ) may be 0.05 ㎛ / s to 1 ㎛ / s or 0.1 ㎛ / s to 0.8 ㎛ / s. The step of cutting the inclined surface may be performed at a horizontal speed (V x ) is the vertical velocity (V y ) can be faster. In addition, in the above-mentioned slope cutting step, the horizontal speed (V x ) and vertical velocity (V y ) ratio (V x / V y ) may be, for example, 10 or more, 15 or more, or 20 or more, so that the lower surface of the blade does not rub the cutting surface. The above ratio (V x / V y ) is not specifically set, but may be, for example, 100 or less, 50 or less, or 30 or less. The above ratio (V x / V y ) may be within a range formed by selecting the upper and lower limits described above.

[0166] In the above-mentioned slope cutting step, the horizontal speed (V) during cutting x ) and vertical velocity (V y) is within the aforementioned range, the bonding force within the electrode in the all-solid-state battery can be measured with high reproducibility, and the thickness can be measured more quickly and accurately. In addition, in the step of cutting the slope, the horizontal speed (V) during cutting x ) and vertical velocity (V y ) ratio (V x / V y ) is controlled within the aforementioned range, the bonding force within the electrode in the all-solid-state battery can be measured with high reproducibility, and the thickness can be measured more quickly and accurately.

[0167] In addition, in the step of cutting the slope, the cutting slope (θ) may be 2.5 degrees or more, 2.6 degrees or more, 2.7 degrees or more, 2.8 degrees or more, 2.9 degrees or more, or 3 degrees or less, 6 degrees or less, 5.9 degrees or less, 5.8 degrees or less, 5.7 degrees or less, 5.6 degrees or less, or 5.5 degrees or less. In addition, the cutting slope (θ) may be within a range formed by appropriately selecting the upper and lower limits described above. In addition, when the cutting slope (θ) satisfies the above-mentioned range, it may be more suitable for measuring the bonding force and thickness.

[0168] In addition, the above-described inclined cutting step can be performed with a cutting device (40) as described above. The cutting device (40) is not particularly limited as long as it includes a blade (41) and can measure the bonding force while performing cutting through the blade, but may be, for example, a SAICAS (surface and interfacial cutting analysis system). The SAICAS may include a blade (41).

[0169] Meanwhile, the cutting device (40) has a horizontal speed (V x ), vertical velocity (V y), cutting inclination (θ), and force applied to an object in contact with the blade (41) can be automatically measured. Here, the cutting device (40) may include various equipment such as a speed meter, an inclination meter, or a force sensor (horizontal and vertical) to measure the above properties. In addition, the cutting device (40) may process data obtained through the above-described equipment by driving software such as a computer program, and may be appropriately connected to each other so that at least some of the equipment included in the cutting device (40) can be organically operated by driving the software with the processed data, etc. The cutting device (40) and at least one equipment included in the cutting device (40) may each include a transmission / reception device capable of transmitting and receiving electronic data generated or converted according to the software, if necessary. In addition, the cutting device (40) and at least one equipment included in the cutting device (40) may each include a control unit that converts the electronic data, if necessary, to operate each of the components. In addition, the cutting device (40) and at least one device included in the cutting device (40) may also include a storage medium capable of storing electronic data generated or converted according to the software, if necessary. The method for transmitting and receiving the electronic data and the method for converting the electronic data are not particularly limited, and any method available in the art may be applied. The storage medium may be a generally known memory device, and for example, cache memory, buffer memory, disk, hard drive, and SSD can be applied without limitation.

[0170] The step of performing the inclined cutting in the thickness measurement method of an all-solid-state battery (10) according to one aspect of the present disclosure may include a step of obtaining load data according to cutting time. The load data may refer to data related to the force applied to the blade (41) with respect to an object contacting the blade (41).

[0171] Fig. 7 is a graph showing an example of load data according to cutting time according to one embodiment of the present disclosure. Referring to Fig. 7, the load data according to cutting time may include first load data and second load data. The first load data may have the cutting time as the first axis, and may mean a graph with the measured load value as the second axis perpendicular to the first axis. The second load data may have the cutting time as the first axis, and the cutting depth (H) as the third axis perpendicular to the first axis. C ) can mean a graph (see Fig. 7).

[0172] Meanwhile, the load value is the vertical force (F) applied to the blade (41). v , N). That is, the load value set on the second axis in the first load data is the vertical force (F) applied to the blade (41). v ) can mean the value of the vertical force (F v ) can be in N (Newton).

[0173] A method for measuring the thickness of an all-solid-state battery (10) according to one aspect of the present disclosure may include a step of measuring the thickness of an active material layer (120, 220) using load data according to the cutting period.

[0174] In one example, the step of measuring the thickness of the active material layer (120, 220) with the load data according to the cutting period is the maximum cutting time (C) at which the cutting time is the greatest among the points where the slope is 0 in the graph of the first load data. T ) may include a step of deriving a thickness. Here, the step of measuring the thickness may include a step of obtaining first load differential data by differentiating a graph of the first load data with respect to the cutting time as the first axis.

[0175] In addition, in the graph of the first load data of the above example, the maximum load value may be 3 N or less, 2.9 N or less, 2.8 N or less, 2.7 N or less, 2.6 N or less, 2.5 N or less, 2.4 N or less, 2.3 N or less, 2.2 N or less, 2.1 N or less, or 2 N or less. In addition, the lower limit of the maximum load value is not particularly limited, but may be 1 N or more, 1.1 N or more, 1.2 N or more, 1.3 N or more, 1.4 N or more, 1.5 N or more, 1.6 N or more, 1.7 N or more, 1.8 N or more, or 1.9 N or more. The maximum load value may be within a range formed by appropriately selecting the upper and lower limits described above. As described above, in the graph of the first load data, the load value may be set to the second axis, which is the vertical force (F) applied to the blade (41). v ) can mean the value of .

[0176] Fig. 8 is a graph showing an example of first load differentiation data according to one embodiment of the present disclosure. Referring to Fig. 8, the maximum cutting time (C) at which the cutting time is the largest among the points where the slope is 0 in the graph of the first load data T ) can utilize the first load differential data obtained in the step of obtaining the first load differential data.

[0177] In addition, the step of measuring the thickness of the active material layer (120, 220) is performed by measuring the maximum cutting time (C) in the graph of the second load data. T ) may include a step of deriving a corresponding cutting depth.

[0178] In addition, the step of measuring the thickness of the active material layer (120, 220) may include a step of determining the corresponding cutting depth derived above as the thickness of the active material layer (120, 220). That is, the maximum cutting time (C) at which the cutting time is the greatest among the points where the slope is 0 in the graph of the first load data T ) can be seen as the point at which the blade (41) starts to cut obliquely from the surface of the active material layer (120, 220) and touches the current collector (110, 210).

[0179] In another example, the step of measuring the thickness of the active material layer (120, 220) with the load data according to the cutting period is the cutting time at the point where the slope is 0 in the graph of the first load data (P T ) may include a step of deriving a thickness. The step of measuring the thickness may include a step of obtaining first load differential data by differentiating the graph of the first load data with the cutting time as the first axis. Referring to FIG. 8, the point cutting time (P ) which is the cutting time at a point where the slope is 0 in the graph of the first load data T ) can utilize the first load differential data obtained in the step of obtaining the first load differential data.

[0180] In addition, in the graph of the first load data of the above example, the maximum load value may be 3.2 N or less, 3.1 N or less, 3 N or less, 2.9 N or less, 2.8 N or less, 2.7 N or less, 2.6 N or less, 2.5 N or less, 2.4 N or less, 2.3 N or less, 2.2 N or less, 2.1 N or less, or 2 N or less. In addition, the lower limit of the maximum load value is not particularly limited, but may be 1 N or more, 1.1 N or more, 1.2 N or more, 1.3 N or more, 1.4 N or more, 1.5 N or more, 1.6 N or more, 1.7 N or more, 1.8 N or more, or 1.9 N or more. The maximum load value may be within a range formed by appropriately selecting the above-mentioned upper and lower limits. As described above, in the graph of the first load data, the load value can be set on the second axis, which is the vertical force (F) applied to the blade (41). v ) can mean the value of .

[0181] In addition, the step of measuring the thickness of the active material layer (120, 220) is performed by measuring the point cutting time (P) in a range of a predetermined cutting depth in the graph of the second load data. T ) may include a step of deriving a corresponding cutting depth corresponding to one of the above. In addition, the point cutting time (P T ) is multiple, the cutting time (P) of the point with the largest value T ) can be used to derive the corresponding cutting depth.

[0182] In the step of deriving the corresponding cutting depth, the range of the predetermined cutting depth may be 22 ㎛ or more, 23 ㎛ or more, 24 ㎛ or more, or 25 ㎛ or more.

[0183] In addition, the step of measuring the thickness of the active material layer (120, 220) may include a step of determining the corresponding cutting depth derived above as the thickness of the active material layer (120, 220).

[0184] Meanwhile, in another example, the point cutting time (P) in the range of the predetermined cutting depth in the graph of the second load data T ) is a step of deriving a corresponding cutting depth corresponding to one of the above point cutting times (P) in a range of predetermined cutting depths. T ) may include a step of deriving a maximum corresponding cutting depth corresponding to a maximum point cutting time.

[0185] In addition, the step of measuring the thickness of the active material layer (120, 220) may include a step of determining the corresponding cutting depth derived above as the thickness of the active material layer (120, 220).

[0186] The above description is merely an example of applying the principles of the present disclosure, and other configurations may be further included without departing from the scope of the present disclosure.

[0187] Below, embodiments of the present invention are further described with reference to specific experimental examples. The examples and comparative examples included in the experimental examples are merely illustrative of the present disclosure and do not limit the scope of the appended claims. It will be apparent to those skilled in the art that various modifications and variations of the examples are possible within the scope and technical spirit of the present disclosure. Furthermore, it is also natural that such modifications and variations fall within the scope of the appended claims.

[0188] Manufacturing example 1.

[0189] A positive electrode (100) to be used in an all-solid-state battery (10) was manufactured as follows. The positive electrode current collector (110) of the positive electrode (100) used an aluminum foil having a thickness of about 12 μm. A positive electrode active material slurry composition forming a positive electrode active material layer (120) on both sides of the positive electrode current collector (110) was applied at an appropriate loading amount, and the aluminum foil on which the positive electrode active material slurry composition was applied was dried at 80°C and then rolled at a pressure of about 300 MPa to manufacture the positive electrode (100). The thickness of the manufactured positive electrode active material layer (120) was approximately 46 μm. A detailed thickness measurement method of the positive electrode active material layer (120) will be described later.

[0190] The above positive electrode active material slurry composition was prepared by mixing positive electrode active material (A), positive electrode binder (B), electrolyte (C), and conductive material (D) in a weight ratio of 80:1:17.5:1.5 (A:B:C:D), and additionally adding a sufficient amount of solvent. The positive electrode active material (A) is LiNi0, which is a lithium nickel-cobalt-manganese (NCM) oxide. . 8Co0 . 1Mn0 . 1O2 was used, and the positive electrode binder (B) used butadiene rubber (BR). In addition, the electrolyte (C) used Li6PS5Cl, and the conductive material (D) used carbon black. In addition, the solvent used was an ester-based organic solvent.

[0191] Manufacturing examples 2 and 3.

[0192] A positive electrode (100) was manufactured using the same method as in Manufacturing Example 1, but by controlling the positive electrode active material slurry composition, loading amount, and rolling pressure.

[0193] Comparative manufacturing example 1.

[0194] A positive electrode (100) was manufactured in the same manner as in Manufacturing Example 1, except that it was rolled at a pressure of about 100 MPa.

[0195] For the positive electrodes (100) manufactured in Manufacturing Examples 1 to 3 and Comparative Manufacturing Example 1, the bonding force (P, see Formula 2) of the positive electrode active material layer (120) of the positive electrode (100) was measured three times each using SAICAS (surface and interfacial cutting analysis systems) and the standard deviation thereof was derived. The cutting inclination (θ) was approximately 5.7 degrees, and the cutting depth (H C ) was approximately 20 ㎛ (depth of inclined cutting from the surface of the active material layer (120, 220)). The derived standard deviation and the ratio of the standard deviation are summarized in Table 1 below. S in Table 1 dR1 is according to the above formula 1.

[0196] Discriminant electrode blade speed standard deviation S dR1 Manufacturing Example 1 Anode Horizontal velocity (Vx): 2 ㎛ / s Vertical velocity (Vy): 0.2 ㎛ / sS d2 ,0.2 =0.057693.325 Horizontal velocity (Vx): 5 ㎛ / s Vertical velocity (Vy): 0.5 ㎛ / sS d5 ,0.5 =0.01735 Manufacturing Example 2 Anode Horizontal velocity (Vx): 2 ㎛ / s Vertical velocity (Vy): 0.2 ㎛ / sS d2 ,0.2 = 0.194210.418 Horizontal velocity (Vx): 5 ㎛ / s Vertical velocity (Vy): 0.5 ㎛ / sS d5 ,0.5 = 0.01864 Manufacturing Example 3 Anode Horizontal velocity (Vx): 2 ㎛ / s Vertical velocity (Vy): 0.2 ㎛ / sS d2 ,0.2 = 0.061272.681 Horizontal velocity (Vx): 5 ㎛ / s Vertical velocity (Vy): 0.5 ㎛ / sS d5 ,0.5 = 0.02285 Comparative manufacturing example 1 Anode horizontal velocity (Vx): 2 ㎛ / s Vertical velocity (Vy): 0.2 ㎛ / sS d2 ,0.2=0.0041630.1567Horizontal velocity (Vx): 5 ㎛ / sVertical velocity (Vy): 0.5 ㎛ / sS d5 ,0.5 =0.02658

[0197] S of the anode in the above table 1 dR1 is in Equation 1A and Equation 1C S dR1A has the same meaning as

[0198] Manufacturing example 4.

[0199] An anode (200) to be used in an all-solid-state battery (10) was manufactured as follows. A carbon-coated copper foil having a thickness of about 8 ㎛ was used as the anode current collector (210) of the anode (200). An anode active material slurry composition forming a cathode active material layer (220) on both sides of the anode current collector (210) was applied at an appropriate loading amount, and the carbon-coated copper foil to which the anode active material slurry composition was applied was dried at 80° C. and then rolled at a pressure of about 300 MPa to manufacture the anode (200). The thickness of the manufactured anode active material layer (220) was about 45 ㎛.

[0200] The above negative active material slurry composition was prepared by mixing a negative active material (A), a negative binder (B), an electrolyte (C), and a conductive agent (D) in a weight ratio of 77:3:19:1 (A:B:C:D), and additionally adding a sufficient amount of solvent. Natural graphite (A1) was used as the negative active material (A). Butadiene rubber (BR) was used as the negative binder (B), and Li6PS5Cl was used as the electrolyte (C). Carbon black was used as the conductive agent (D). In addition, an ester-based organic solvent was used as the solvent.

[0201] Manufacturing Examples 5 and 6.

[0202] A negative electrode (200) was manufactured in the same manner as in Manufacturing Example 4 by controlling the negative active material slurry composition, loading amount, and rolling pressure.

[0203] Comparative manufacturing example 2.

[0204] A cathode (200) was manufactured in the same manner as in Manufacturing Example 4, except that it was rolled at a pressure of approximately 100 MPa.

[0205] For the negative electrodes (200) manufactured in Manufacturing Examples 4 to 6 and Comparative Manufacturing Example 2, the bonding force (P, see Formula 2) of the negative electrode active material layer (220) of the negative electrode (200) was measured three times each using SAICAS (surface and interfacial cutting analysis systems) and the standard deviation thereof was derived. The cutting inclination (θ) was approximately 5.7 degrees, and the cutting depth (H C ) was approximately 20 ㎛ (depth of inclined cutting from the surface of the active material layer (120, 220)). The derived standard deviation and the ratio of the standard deviation are summarized in Table 2 below. S in Table 2 dR1 is according to the above formula 1.

[0206] Discriminant electrode blade speed standard deviation S dR1 Manufacturing Example 4 Cathode Horizontal Velocity (Vx): 2 ㎛ / s Vertical Velocity (Vy): 0.2 ㎛ / sS d2 ,0.2 =0.0080212.119Horizontal velocity (Vx): 5 ㎛ / sVertical velocity (Vy): 0.5 ㎛ / sS d5 ,0.5 =0.003786 Manufacturing Example 5 Cathode Horizontal velocity (Vx): 2 ㎛ / s Vertical velocity (Vy): 0.2 ㎛ / sS d2 ,0.2 = 0.04281310.399 Horizontal velocity (Vx): 5 ㎛ / s Vertical velocity (Vy): 0.5 ㎛ / sS d5 ,0.5 = 0.004117 Manufacturing Example 6 Cathode Horizontal velocity (Vx): 2 ㎛ / s Vertical velocity (Vy): 0.2 ㎛ / sSd2 ,0.2 = 0.039861.882 Horizontal velocity (Vx): 5 ㎛ / s Vertical velocity (Vy): 0.5 ㎛ / sS d5 ,0.5 = 0.02118Comparative manufacturing example 2 Cathode Horizontal velocity (Vx): 2 ㎛ / sVertical velocity (Vy): 0.2 ㎛ / s0.0034640.7330Horizontal velocity (Vx): 5 ㎛ / sVertical velocity (Vy): 0.5 ㎛ / s0.004726

[0207] In Table 2 above, S of the cathode dR1 is in formula 1B and formula 1C S dR1B has the same meaning as

[0208] Example 1.

[0209] To evaluate the performance of the positive electrode manufactured in Manufacturing Example 1, an all-solid-state battery was manufactured using lithiated indium as a counter electrode. An argyrodite-type sulfide-based solid electrolyte was used as the solid electrolyte layer of the all-solid-state battery. Specifically, an argyrodite-type sulfide-based solid electrolyte was placed in a pressed cell and pressurized to form the solid electrolyte layer, a lithiated indium counter electrode was placed on one surface of the solid electrolyte layer, and the positive electrode, perforated to a thickness of 10 pi, was placed on the other surface, and then pressurized at 300 to 500 MPa to manufacture an all-solid-state battery. The thickness of the manufactured electrolyte layer was approximately 700 μm.

[0210] Electrochemical evaluation was conducted on the battery of Example 1 obtained in this way.

[0211] Example 2.

[0212] An all-solid-state battery was manufactured in the same manner as in Example 1, except that the positive electrode manufactured in Manufacturing Example 2 was used, and electrochemical evaluation was performed.

[0213] Example 3.

[0214] An all-solid-state battery was manufactured in the same manner as in Example 1, except that the positive electrode manufactured in Manufacturing Example 3 was used, and electrochemical evaluation was performed.

[0215] Comparative Example 1.

[0216] An all-solid-state battery was manufactured in the same manner as Example 1, except that the positive electrode manufactured in Comparative Manufacturing Example 1 was used.

[0217] Example 4.

[0218] An all-solid-state battery was manufactured in the same manner as in Example 1, except that the negative electrode of Manufacturing Example 4 was used as the negative electrode and the same lithiated indium as in Example 1 was used as the counter electrode.

[0219] Example 5.

[0220] An all-solid-state battery was manufactured in the same manner as in Example 4, except that the negative electrode manufactured in Manufacturing Example 5 was used, and electrochemical evaluation was performed.

[0221] Example 6.

[0222] An all-solid-state battery was manufactured in the same manner as in Example 4, except that the negative electrode manufactured in Manufacturing Example 6 was used, and electrochemical evaluation was performed.

[0223] Comparative Example 2.

[0224] An all-solid-state battery was manufactured in the same manner as Example 4, except that the negative electrode manufactured in Comparative Manufacturing Example 2 was used.

[0225] Experimental Example 1: Electrochemical Evaluation 1

[0226] The discharge capacity in the first cycle of the all-solid-state batteries manufactured in the above examples and comparative examples was measured using a charger / discharger (manufacturer: Won-A Tech Co., Ltd., model name: WBCS3000). Specifically, the all-solid-state batteries manufactured in the above examples 1 to 6 and comparative examples 1 and 2 were charged with a constant current at a rate (C-rate) of 0.1 C at about 30°C until the voltage reached 3.65 V, and then charged with a constant voltage by cutting off at a rate (C-rate) of 0.01 C while maintaining 3.65 V in constant voltage mode. Thereafter, constant current discharge was performed at a rate (C-rate) of 0.1 C until the voltage reached 1.88 V. At this time, the discharge capacity (initial discharge capacity, C) in the first cycle (n=1) was measured. 0.1 ) were measured and summarized in Table 3 below.

[0227] For the all-solid-state batteries (10) manufactured in the above Examples 1 to 6 and Comparative Examples 1 and 2, constant current charging was performed at a rate (C-rate) of 1C at about 30°C until the voltage reached 3.65 V, and then constant voltage charging was performed by cutting off at a rate (C-rate) of 0.1C while maintaining 3.65 V in constant voltage mode. Thereafter, constant current discharge was performed at a rate (C-rate) of 1C until the voltage reached 1.88 V. At this time, the discharge capacity (C1) in the first cycle (n=1) was measured, and the measured discharge capacity (C1) was expressed as the discharge capacity (C 0.1 ) and multiplied by 100 to obtain the rate of retention (unit: %), which is summarized in Table 3 below.

[0228] Initial discharge capacity (unit: mAh / g) Rate retention (unit: %) Example 119577 Example 219175 Example 318572 Comparative example 117268

[0229] Referring to Table 3 above, it can be seen that the initial discharge capacity and rate retention rate of the all-solid-state battery using the positive electrode according to the embodiment of the present disclosure are both superior to those of the comparative example. Specifically, S by Equation 1 for the positive electrode of the all-solid-state battery according to the present disclosure dR1 It can be confirmed that Examples 1 to 3, in which the value is 1 or more, have a higher initial discharge capacity than Comparative Example 1, and also have an excellent rate retention rate. Through this, the all-solid-state battery according to the present disclosure has S of Equation 1 dR1 of It can be confirmed that it has excellent electrochemical performance in the range where the value is 1 or more.

[0230] Experimental Example 2: Electrochemical Evaluation 2

[0231] Electrochemical evaluation was performed on the all-solid-state batteries manufactured in Examples 4 to 6 and Comparative Example 2 using a charger / discharger (Manufacturer: Won-A Tech Co., Ltd., Model: WBCS3000). The all-solid-state batteries manufactured in Examples 7 to 12 and Comparative Example 3 were charged at a constant current rate (C-rate) of 1C at about 30°C until the voltage reached -0.615 V, and then charged at a constant voltage by cutting off at a rate (C-rate) of 0.1 C while maintaining -0.615 V in constant voltage mode. Thereafter, constant current discharge was performed at a rate (C-rate) of 1 C until the voltage reached 1.38 V. At this time, the discharge capacity (initial discharge capacity, C) in the first cycle (n=1) was measured. 0.1 ) were measured and summarized in Table 4 below.

[0232] In addition, the all-solid-state batteries manufactured in Examples 4 to 6 and Comparative Example 2 were charged at a constant current rate (C-rate) of 1C at about 30°C until the voltage reached -0.615 V, and then charged at a constant voltage by cutting off at a rate (C-rate) of 0.1 C while maintaining -0.615 V in constant voltage mode. After that, the constant current discharge was performed at a rate (C-rate) of 1 C until the voltage reached 1.38 V. At this time, the discharge capacity (C1) in the first cycle (n=1) was measured, and the measured discharge capacity (C1) was expressed as the discharge capacity (C 0.1 ) and multiplied by 100 to obtain the rate of retention (unit: %), which is summarized in Table 4 below.

[0233] Initial discharge capacity (unit: mAh / g) Rate retention (unit: %) Example 434086 Example 533183 Example 632581 Comparative example 228578

[0234] Referring to Table 4 above, it can be seen that the initial discharge capacity and rate retention rate of the all-solid-state battery applying the negative electrode according to the embodiment of the present disclosure are both superior to those of the comparative example. Specifically, referring to Examples 4 to 6 and Comparative Example 2, S by Equation 1 for the negative electrode of the all-solid-state battery according to the present disclosure dR1 Examples 4 to 6 with a value of 1 or greater are S dR1 It can be confirmed that the all-solid-state battery has a higher initial discharge capacity than Comparative Example 2, where the value is less than 1, and also has an excellent rate retention rate. Through this, the all-solid-state battery according to the present disclosure has S of Equation 1 dR1 of It can be confirmed that it has excellent electrochemical performance in the range where the value is 1 or more.

[0235] Example 7.

[0236] An all-solid-state battery was manufactured using the positive electrode of Manufacturing Example 1 and the negative electrode of Manufacturing Example 4. An argyrodite-type sulfide-based solid electrolyte was used as the solid electrolyte layer of the all-solid-state battery. Specifically, an argyrodite-type sulfide-based solid electrolyte was placed in a pressed cell and pressurized to form the solid electrolyte layer, and the positive electrode of Manufacturing Example 1, perforated to 10 pi, was placed on one side of the solid electrolyte layer, and the negative electrode of Manufacturing Example 4, perforated to 10 pi, was placed on the other side, and then pressurized at 300 to 500 MPa to manufacture an all-solid-state battery. The thickness of the manufactured electrolyte layer was about 700 μm. Formula 1A for the positive electrode of Manufacturing Example 1 and the negative electrode of Manufacturing Example 4 S dR1A , S in formula 1B dR1B , R in formula 1C AB is summarized in Table 5 below.

[0237] Distinction Anode Cathode S dR1A S dR1B R AB =S dR1A / S dR1B Example 7 Manufacturing Example 1 Manufacturing Example 43.3252.1191.569

[0238] Thickness measurement example 1.

[0239] The thickness of the positive electrode active material layer (120) of the positive electrode (100) manufactured in the above manufacturing example 1 was measured using SAICAS (surface and interfacial cutting analysis systems).

[0240] The cutting device (40), SAICAS, was positioned at a higher position than the positive electrode active material layer (120). Then, the blade (41) included in the SAICAS was positioned to contact the surface of the positive electrode active material layer (120). Then, the cutting inclination (θ) was about 5.7 degrees, and the horizontal speed (V) of the blade (41) was x ) at about 5 ㎛ / s and vertical velocity (V y) was cut at an angle of about 0.5 ㎛ / s, and the positive electrode active material layer (120) was cut obliquely with the blade (41). In this process, load data including first load data and second load data were obtained as shown in Fig. 7. In addition, the obtained first load data was differentiated by the cutting time to obtain first load differential data as shown in Fig. 8.

[0241] Referring to Fig. 8, the maximum cutting time (C) at which the cutting time is the greatest among the points where the slope is 0 in the graph of the first load data T ) was found to be approximately 91 seconds. Here, the cutting depth corresponding to 91 seconds in the graph of the second load data was found to be approximately 46 ㎛.

[0242] Referring to Fig. 8, the point cutting time (P) is the cutting time at the point where the slope is 0 in the graph of the first load data. T ) can be derived. The cutting time (P) at the point at a predetermined cutting depth of about 22 ㎛ or more T ) was found to be approximately 91 seconds. Here, the cutting depth corresponding to 91 seconds in the graph of the second load data was found to be approximately 46 ㎛.

[0243] In addition, the thickness of the active material layer (120) of the positive electrode (100) was measured by repeating the measurement three times using the above SAICAS, and the results are summarized in Table 6 below.

[0244] Thickness measurement example 2.

[0245] The horizontal velocity (V) of the blade (41) was measured for the positive electrode (100) manufactured in the above manufacturing example 1. x ) was set to about 2 ㎛ / s and the vertical velocity (Vy) was set to about 0.2 ㎛ / s, and the thickness of the active material layer (120) of the positive electrode (100) was measured in the same manner as in Example 1 of the thickness measurement.

[0246] In addition, the thickness of the active material layer (120) of the positive electrode (100) was measured by repeating the measurement three times using the SAICAS, and the results are summarized in Table 3 below.

[0247] Thickness measurement reference example 1.

[0248] The thickness of the active material layer (120) of the positive electrode (100) manufactured in the above Manufacturing Example 1 was measured using a micrometer, and the results are summarized in Table 3 below.

[0249] Thickness measurement reference example 2.

[0250] An electrode cross-section sample was prepared using an ion milling device for the positive electrode (100) manufactured in the above Manufacturing Example 1, and the thickness of the active material layer (120) of the positive electrode (100) was measured using a scanning electron microscope (SEM), and the results are summarized in Fig. 9 and Table 6 below. Fig. 9 shows a scanning electron microscope image of the positive electrode (100).

[0251] Thickness measurement (unit: ㎛)Average thickness (unit: ㎛)Thickness measurement example 11 times46.846.32 times46.43 times45.7Thickness measurement example 21 times46.045.92 times45.53 times46.3Thickness measurement reference example 11 times45.445.52 times45.6Thickness measurement reference example 21 times46.646.62 times46.5

[0252] Referring to Table 6 above, it can be seen that the thickness of the positive electrode active material layer (120) measured by the cutting device (40), SAICAS, does not differ significantly from the thickness of the positive electrode active material layer (120) measured by a micrometer or scanning electron microscope image. Therefore, it can be seen that the thickness measurement method according to one aspect of the present disclosure can be quickly and accurately measured.

[0253] Various aspects of the present disclosure are as follows.

[0254] First aspect: An all-solid-state battery according to the present disclosure comprises at least one electrode and an electrolyte layer, wherein the electrode comprises a current collector and an active material layer, and S according to the following formula 1 dR1 This can be more than 1.

[0255] [Formula 1]

[0256] S dR1 =S d2 ,0.2 / S d5 ,0.5

[0257] In the above formula 1, S d2 ,0.2 is the standard deviation of the bonding force of the active material layer measured three times by cutting at an inclined speed of 2 ㎛ / s in the horizontal direction and 0.2 ㎛ / s in the vertical direction from the surface of the active material layer, and S d5 ,0.5 is the standard deviation of the bonding force of the active material layer measured three times by cutting at an inclined speed of 5 ㎛ / s in the horizontal direction and 0.5 ㎛ / s in the vertical direction from the surface of the active material layer.

[0258] Second aspect: In the first aspect, S according to the above formula 1 dR1 can be less than 10.

[0259] Third aspect: In the first aspect or the second aspect, the active material layer is a positive electrode active material layer, and S according to the above formula 1 d5 ,0.5 may be less than 0.02.

[0260] Aspect 4: In the first or second aspect, the active material layer is a negative active material layer, and S according to the above formula 1 d5 ,0.5 may be less than 0.02.

[0261] Aspect 5: In any one of the aspects 1 to 4, S in the above formula 1 d2,0.2 and S d5 ,0.5It may be the standard deviation of the bonding strength of the active material layer measured three times by independently cutting at an angle of 2.5 to 6 degrees.

[0262] Aspect 6: In any one of the first to fifth aspects, the bonding force of the active material layer may be measured at a cutting depth of 20% to 80% of the total thickness from the surface of the active material layer.

[0263] Aspect 7: In any one of the first to sixth aspects, the bonding force of the active material layer can be measured by a surface and interfacial cutting analysis system (SAICAS) including a blade.

[0264] Aspect 8: In the aspect 7, the bonding force (P) of the active material layer may be measured according to the following equation 2.

[0265] [Formula 2]

[0266]

[0267] In the above formula 2, F h is the horizontal force (N) applied to the blade, and w represents the width (mm) of the blade.

[0268] Aspect 9: In any one of the first to eighth aspects, the thickness of the active material layer may be in a range of 22 μm to 130 μm.

[0269] Aspect 10: In any one of the first to ninth aspects, the active material layer and the electrolyte layer may be in close contact by being pressed at a pressure of 200 MPa or more.

[0270] Aspect 11: In any one of aspects 1 to 10, the active material layer may include an active material and a binder.

[0271] Aspect 12: In any one of aspects 1 to 11, the electrolyte layer may include at least one selected from the group consisting of a polymer electrolyte, an oxide electrolyte, and a sulfide electrolyte.

[0272] Aspect 13: One aspect of the present disclosure relates to a method for measuring the thickness of an all-solid-state battery, wherein the all-solid-state battery includes at least one electrode and an electrolyte layer, the electrode includes a current collector and an active material layer, and includes a step of obliquely cutting from a surface of the active material layer, wherein the obliquely cutting step is performed at a horizontal speed of 1 μm / s to 10 μm / s and a vertical speed of 0.05 μm / s to 1 μm / s.

[0273] Aspect 14: In the 13th aspect, the step of cutting the slope can be performed at a cutting slope of 2.5 degrees to 6 degrees.

[0274] Aspect 15: In the 13th aspect or the 14th aspect, the step of cutting the slope can be performed by a surface and interfacial cutting analysis systems (SAICAS) including a blade.

[0275] Aspect 16: In any one of aspects 13 to 15, the step of performing the inclined cutting may further include a step of obtaining load data according to cutting time, and a step of measuring the thickness of the active material layer using the load data according to the cutting time.

[0276] Aspect 17: In the aspect 16, the load data according to the cutting time includes first load data and second load data, the first load data is a graph in which the first axis is the cutting time and the second axis perpendicular to the first axis is the load value, the second load data is a graph in which the first axis is the cutting time and the third axis perpendicular to the first axis is the cutting depth, and the load value may be a vertical force applied to the blade.

[0277] 18th aspect: In the 17th aspect, the step of measuring the thickness of the active material layer includes the step of deriving a maximum cutting time at which the cutting time is the greatest among points where the slope is 0 in the graph of the first load data, and the step of deriving a corresponding cutting depth corresponding to the maximum cutting time in the graph of the second load data, wherein the corresponding cutting depth can be determined as the thickness of the active material layer.

[0278] Aspect 19: In the aspect 18, the maximum load value in the graph of the first load data may be 3 N or less.

[0279] Aspect 20: In the 17th aspect, the step of measuring the thickness of the active material layer includes a step of deriving a point cutting time, which is a cutting time at a point where the slope is 0 in the graph of the first load data, and a step of deriving a corresponding cutting depth corresponding to one of the point cutting times within a range of predetermined cutting depths in the graph of the second load data, wherein the corresponding cutting depth can be determined as the thickness of the active material layer.

[0280] Aspect 21: In the 20th aspect, the range of the predetermined cutting depth may be 22 μm or more.

[0281] Aspect 22: In the 21st aspect, the step of deriving the corresponding cutting depth includes a step of deriving a maximum corresponding cutting depth corresponding to a maximum point cutting time among the point cutting times within a range of predetermined cutting depths, and the maximum corresponding cutting depth can be determined by the thickness of the active material layer.

[0282] [Explanation of symbols]

[0283] 10: All-solid-state batteries

[0284] 30: Electrolyte layer

[0285] 40: Cutting device

[0286] 41: Blade

[0287] 100: Bipolar

[0288] 110: Positive current collector

[0289] 120: Positive electrode active material layer

[0290] 200: Cathode

[0291] 210: Negative current collector

[0292] 220: Negative active material layer

Claims

1. Containing at least one electrode and an electrolyte layer, The above electrode includes a current collector and an active material layer, and S according to the following formula 1 dR1 All-solid-state batteries having 1 or more of these: [Formula 1] S dR1 =S d2 ,0.2 / S d5 ,0.5 In the above formula 1, S d2 ,0.2 is the standard deviation of the bonding force of the active material layer measured three times by cutting at an inclined speed of 2 ㎛ / s in the horizontal direction and 0.2 ㎛ / s in the vertical direction from the surface of the active material layer, and S d5 ,0.5 is the standard deviation of the bonding force of the active material layer repeatedly measured three times by cutting at an inclined speed of 5 ㎛ / s in the horizontal direction and 0.5 ㎛ / s in the vertical direction from the surface of the active material layer.

2. In paragraph 1, S according to the above formula 1 dR1 All-solid-state battery with a value of 10 or less.

3. In paragraph 1, The above active material layer is a positive electrode active material layer, S according to the above formula 1 d5 ,0.5 All-solid-state battery with a C of 0.02 or less.

4. In paragraph 1, The above active material layer is a negative electrode active material layer, S according to the above formula 1 d5 ,0.5 All-solid-state battery with a C of 0.02 or less.

5. In paragraph 1, In the above formula 1, S d2 ,0.2 and S d5 ,0.5 An all-solid-state battery, wherein the standard deviation of the bonding strength of the active material layer is independently measured three times by cutting at an angle of 2.5 to 6 degrees.

6. In paragraph 1, The bonding strength of the above active material layer is an all-solid-state battery in which the cutting depth is measured at 20% to 80% of the total thickness from the surface of the active material layer.

7. In paragraph 1, An all-solid-state battery in which the bonding strength of the active material layer is measured using SAICAS (surface and interfacial cutting analysis systems) including a blade.

8. In paragraph 7, The bonding force (P) of the above active material layer is measured according to the following Equation 2: All-solid-state battery: [Formula 2] In the above formula 2, F h is the horizontal force (N) applied to the blade, and w represents the width of the blade (mm).

9. In paragraph 1, An all-solid-state battery wherein the thickness of the active material layer is in the range of 22 ㎛ to 130 ㎛.

10. In paragraph 1, An all-solid-state battery in which the active material layer and the electrolyte layer are in close contact by being pressurized at a pressure of 200 MPa or more.

11. In paragraph 1, The above active material layer is an all-solid-state battery including an active material and a binder.

12. In paragraph 1, An all-solid-state battery, wherein the electrolyte layer comprises at least one selected from the group consisting of a polymer electrolyte, an oxide electrolyte, and a sulfide electrolyte.

13. In the method of measuring the thickness of an all-solid-state battery, The above all-solid-state battery comprises at least one electrode and an electrolyte layer, The above electrode includes a current collector and an active material layer, and includes a step of cutting the active material layer obliquely from the surface thereof. A method for measuring the thickness of an all-solid-state battery, wherein the above-mentioned inclined cutting step is performed at a horizontal speed of 1 ㎛ / s to 10 ㎛ / s and a vertical speed of 0.05 ㎛ / s to 1 ㎛ / s.

14. In paragraph 13, A method for measuring the thickness of an all-solid-state battery, wherein the above-mentioned step of cutting the slope is performed at a cutting slope of 2.5 to 6 degrees.

15. In paragraph 13, A method for measuring the thickness of an all-solid-state battery, wherein the above-mentioned inclined cutting step is performed using SAICAS (surface and interfacial cutting analysis systems) including a blade.

16. In paragraph 15, The above-mentioned step of cutting the slope includes a step of obtaining load data according to cutting time, A method for measuring the thickness of an all-solid-state battery, further comprising the step of measuring the thickness of the active material layer using load data according to the cutting time.

17. In paragraph 16, The load data according to the above cutting time includes first load data and second load data, The above first load data is a graph in which the first axis is the cutting time and the second axis perpendicular to the first axis is the load value, and the above second load data is a graph in which the first axis is the cutting time and the third axis perpendicular to the first axis is the cutting depth. The above load value is a thickness measurement method of an all-solid-state battery, which is a vertical force applied to the blade.

18. In paragraph 17, The step of measuring the thickness of the above active material layer is: Including a step of deriving the maximum cutting time at which the cutting time is the largest among the points where the slope is 0 in the graph of the first load data, A step of deriving a corresponding cutting depth corresponding to the maximum cutting time from a graph of the second load data, A method for measuring the thickness of an all-solid-state battery, wherein the corresponding cutting depth is determined as the thickness of the active material layer.

19. In paragraph 18, A method for measuring the thickness of an all-solid-state battery in which the maximum load value in the graph of the first load data above is 3 N or less.

20. In paragraph 17, The step of measuring the thickness of the above active material layer is: Including a step of deriving a point cutting time, which is the cutting time at a point where the slope is 0 in the graph of the first load data, A step of deriving a corresponding cutting depth corresponding to one of the point cutting times within a range of predetermined cutting depths from a graph of the second load data, A method for measuring the thickness of an all-solid-state battery, wherein the corresponding cutting depth is determined as the thickness of the active material layer.

21. In paragraph 20, A method for measuring the thickness of an all-solid-state battery, wherein the above-determined cutting depth range is 22 ㎛ or more.

22. In paragraph 20, The step of deriving the corresponding cutting depth includes the step of deriving the maximum corresponding cutting depth corresponding to the maximum point cutting time among the point cutting times within a range of predetermined cutting depths, A method for measuring the thickness of an all-solid-state battery, wherein the maximum corresponding cutting depth is determined by the thickness of the active material layer.

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