All solid state battery with improved durability and manufacturing method thereof

Abstract

The present invention relates to an all-solid-state battery in which lithium is uniformly precipitated and has excellent durability, and a method for manufacturing the same.

Description

Technology Field

[0001] The present invention relates to an all-solid-state battery in which lithium is uniformly precipitated and has excellent durability, and a method for manufacturing the same. Background Technology

[0002] An all-solid-state battery is a three-layer laminate comprising a positive electrode layer bonded to a positive electrode current collector, a negative electrode layer bonded to a negative electrode current collector, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer. Generally, the negative electrode layer of an all-solid-state battery contains an active material such as graphite and a solid electrolyte. The solid electrolyte is responsible for the movement of lithium ions within the negative electrode layer. However, the solid electrolyte has a higher specific gravity than the electrolyte of a lithium-ion battery, and due to its presence, the proportion of the active material within the negative electrode layer is reduced, so the actual energy density of the all-solid-state battery is lower than that of a lithium-ion battery.

[0003] Research is underway to apply lithium metal as the anode layer to increase the energy density of all-solid-state batteries. However, all-solid-state batteries using lithium metal face many obstacles to overcome, ranging from technical issues such as interfacial bonding and lithium dendrite growth to industrial issues such as cost and large-area fabrication.

[0004] Recently, research has been conducted on all-solid-state batteries that eliminate the negative electrode layer and directly deposit lithium ions migrating to the negative current collector during charging onto the negative current collector. However, these all-solid-state batteries have a problem in that it is difficult to deposit lithium uniformly on the negative current collector, which leads to an increase in irreversible reactions and consequently reduces durability. Prior art literature

[0005] Korean Patent Publication No. 10-2018-0091678 The problem to be solved

[0006] The present invention aims to provide an all-solid-state battery in which lithium is uniformly precipitated and has excellent durability, and a method for manufacturing the same.

[0007] The objectives of the present invention are not limited to those mentioned above. The objectives of the present invention will become more apparent from the following description and will be realized by the means and combinations thereof described in the claims. means of solving the problem

[0008] A solid-state battery according to one embodiment of the present invention comprises a negative electrode current collector; a functional layer comprising a material that forms an alloy or compound with lithium and is located on the negative electrode current collector; a solid electrolyte layer located on the functional layer; and a positive electrode layer located on the solid electrolyte layer, wherein the functional layer comprises a first interface layer on the side of the solid electrolyte layer and a second interface layer on the side of the negative electrode current collector, and the ratio (b / a) of the binding force (a) of the first interface layer and the binding force (b) of the second interface layer may be 0.6 or higher.

[0009] The above material comprises amorphous carbon; and a metal powder capable of alloying with lithium, and the metal powder may include at least one selected from the group consisting of gold (Au), platinum (Pt), palladium (Pd), silicon (Si), silver (Ag), aluminum (Al), bismuth (Bi), tin (Sn), zinc (Zn), and combinations thereof.

[0010] The above functional layer may include a binder.

[0011] The thickness of the above functional layer may be 10㎛ to 30㎛.

[0012] The bonding force between the first and second interface layers can be obtained by using a Surface and Interfacial Cutting Analysis System (SAICAS) to perform inclined cutting from the surface of each interface layer to a certain depth and calculating the force applied to the Surface and Interfacial Cutting Analysis System at that point.

[0013] With the above surface-interface cutting analysis system, the bonding force can be obtained by bevel cutting the first interface layer and the second interface layer from their surface to a depth greater than 0 μm and less than or equal to 3 μm.

[0014] When charging the above all-solid-state battery, lithium metal may be deposited between the functional layer and the negative electrode current collector.

[0015] A method for manufacturing an all-solid-state battery according to one embodiment of the present invention may include the steps of: preparing a slurry comprising amorphous carbon, a metal powder capable of alloying with lithium, and a binder; applying the slurry onto a substrate; drying the applied product at a first temperature for a first time; drying the product dried at a second temperature lower than the first temperature for a second time longer than the first time to form a functional layer; and obtaining a structure in which a negative electrode current collector, the functional layer, a solid electrolyte layer, and a positive electrode layer are sequentially stacked.

[0016] The above first drying can be performed at 100°C to 140°C for 0.5 minutes to 5 minutes.

[0017] The above secondary drying can be performed at 80°C to 100°C for 10 minutes or less. Effects of the invention

[0018] According to the present invention, lithium is uniformly precipitated, so an all-solid-state battery with excellent durability can be obtained.

[0019] The effects of the present invention are not limited to those mentioned above. It should be understood that the effects of the present invention include all effects that can be inferred from the following description. Brief explanation of the drawing

[0020] FIG. 1 illustrates an all-solid-state battery according to the present invention. FIG. 2 illustrates a charged state of an all-solid-state battery according to the present invention. FIG. 3 illustrates a functional layer (20) according to the present invention. Figure 4 is a reference diagram for explaining how to determine the bonding strength of a functional layer using a surface-interface cutting analysis system (SAICAS). Figure 5 shows the charge state of an all-solid-state battery according to a comparative example. Figure 6 shows the charge state of an all-solid-state battery according to an embodiment. Specific details for implementing the invention

[0021] The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete and to ensure that the spirit of the invention is sufficiently conveyed to a person skilled in the art.

[0022] In describing each drawing, similar reference numerals have been used for similar components. In the attached drawings, the dimensions of the structures are depicted enlarged from their actual size for clarity of the invention. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0023] In this specification, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Furthermore, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only the case where it is "immediately above" the other part, but also the case where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "below" another part, this includes not only the case where it is "immediately below" the other part, but also the case where there is another part in between.

[0024] Unless otherwise specified, all numbers, values, and / or expressions used herein to represent amounts of ingredients, reaction conditions, polymer compositions, and formulations should be understood to be modified by the term “approximately” in all cases, as these numbers are essentially approximations reflecting the various uncertainties of measurement that occur in obtaining these values ​​among other things. Furthermore, where numerical ranges are disclosed herein, such ranges are continuous and, unless otherwise indicated, include all values ​​from the minimum value of such range to the maximum value including said maximum value. Moreover, where such ranges refer to integers, they include all integers from the minimum value to said maximum value including said maximum value, unless otherwise indicated.

[0026] FIG. 1 illustrates an all-solid-state battery according to the present invention. Referring thereto, the all-solid-state battery may be a stack of a negative electrode current collector (10), a functional layer (20), a solid electrolyte layer (30), a positive electrode layer (40), and a positive electrode current collector (50).

[0027] FIG. 2 illustrates a charged state of an all-solid-state battery according to the present invention. Referring to the figure, when the all-solid-state battery is charged, lithium metal (Li) can be deposited and stored between the functional layer (20) and the negative current collector (10).

[0028] Below, each component of the above-mentioned all-solid-state battery will be described in detail.

[0029] (Bipolar house whole)

[0030] The above positive current collector (50) may be a plate-shaped substrate that is electrically conductive. Specifically, the above positive current collector (50) may have the form of a sheet or a thin film.

[0031] The above positive current collector (50) may include at least one selected from the group consisting of indium, copper, magnesium, aluminum, stainless steel, iron, and combinations thereof.

[0032] (Bipolar layer)

[0033] The anode layer (40) is configured to reversibly absorb and release lithium ions. The anode layer (40) may include an anode active material, a solid electrolyte, a conductive material, a binder, etc.

[0034] The above positive active material may be an oxide active material or a sulfide active material.

[0035] The above oxide active materials are LiCoO2, LiMnO2, LiNiO2, LiVO2, Li1 + x Ni1 / 3Co1 / 3Mn1 / Rock salt layer type active materials such as 3O2, LiMn2O4, Li(Ni 0.5 Mn 1.5 Spinel-type active materials such as )O4, inverse spinel-type active materials such as LiNiVO4 and LiCoVO4, olivine-type active materials such as LiFePO4, LiMnPO4, LiCoPO4, and LiNiPO4, silicon-containing active materials such as Li2FeSiO4 and Li2MnSiO4, LiNiO .8Co (0.2-x) Al x A salt-layered active material in which a portion of the transition metal is replaced with a heterogeneous metal, such as O2 (0<x<0.2), Li 1+x Mn 2-x-y M y Spinel-type active material in which a portion of the transition metal is replaced with a heterogeneous metal, such as O4 (M is at least one of Al, Mg, Co, Fe, Ni, Zn and 0 < x+y < 2), Li4Ti5O 12 It may be lithium titanate.

[0036] The above sulfide active material may be copper chevrell, iron sulfide, cobalt sulfide, nickel sulfide, etc.

[0037] The above solid electrolyte may be an oxide-based solid electrolyte or a sulfide-based solid electrolyte. However, it may be preferable to use a sulfide-based solid electrolyte with high lithium ion conductivity. The above sulfide-based solid electrolyte is not particularly limited, but includes Li2S-P2S5, Li2S-P2S5-LiI, Li2S-P2S5-LiCl, Li2S-P2S5-LiBr, Li2S-P2S5-Li2O, Li2S-P2S5-Li2O-LiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, and Li2S-P2S5-Z m S n (where m and n are positive numbers, and Z is one of Ge, Zn, or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li x MO y (where x and y are positive numbers, and M is one of P, Si, Ge, B, Al, Ga, or In), Li 10 GeP2S 12 It could be the back.

[0038] The above conductive material may be carbon black, conducting graphite, ethylene black, graphene, etc.

[0039] The above binder may be BR (Butadiene rubber), NBR (Nitrile butadiene rubber), HNBR (Hydrogenated nitrile butadiene rubber), PVDF (polyvinylidene difluoride), PTFE (polytetrafluoroethylene), CMC (carboxymethylcellulose), etc.

[0040] (Solid electrolyte layer)

[0041] The solid electrolyte layer (30) is located between the anode layer (40) and the cathode current collector (10) and is configured to facilitate the movement of lithium ions.

[0042] The above solid electrolyte layer (30) may include a solid electrolyte that is lithium ion conductive.

[0043] The above solid electrolyte may be an oxide-based solid electrolyte or a sulfide-based solid electrolyte. However, it may be preferable to use a sulfide-based solid electrolyte with high lithium ion conductivity. The above sulfide-based solid electrolyte is not particularly limited, but includes Li2S-P2S5, Li2S-P2S5-LiI, Li2S-P2S5-LiCl, Li2S-P2S5-LiBr, Li2S-P2S5-Li2O, Li2S-P2S5-Li2O-LiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, and Li2S-P2S5-Z m S n (where m and n are positive numbers, and Z is one of Ge, Zn, or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Lix MO y (where x and y are positive numbers, and M is one of P, Si, Ge, B, Al, Ga, or In), Li 10 GeP2S 12 It may be the same as, etc. The solid electrolyte included in the solid electrolyte layer (30) may be the same as or different from that included in the anode layer (40).

[0044] The solid electrolyte layer (30) may further include a binder. The binder may be BR (butadiene rubber), NBR (nitrile butadiene rubber), HNBR (hydrogenated nitrile butadiene rubber), PVDF (polyvinylidene difluoride), PTFE (polytetrafluoroethylene), CMC (carboxymethylcellulose), etc. The binder included in the solid electrolyte layer (30) may be the same or different from that included in the anode layer (40).

[0045] (Cathode current collector)

[0046] The above-mentioned negative current collector (10) may be a plate-shaped substrate having electrical conductivity. Specifically, the above-mentioned negative current collector (10) may have the form of a sheet or a thin film.

[0047] The above negative electrode current collector (10) may include a material that does not react with lithium. Specifically, the above negative electrode current collector (10) may include at least one selected from the group consisting of nickel, stainless steel, titanium, cobalt, iron, and combinations thereof.

[0048] (Functional layer)

[0049] The above functional layer (20) is located between the negative electrode current collector (10) and the solid electrolyte layer (30) to prevent the lithium metal (Li) deposited and stored on the negative electrode current collector (10) during charging from coming into physical contact with the solid electrolyte layer (30).

[0050] In addition, the functional layer (20) assists in the movement of lithium ions moving through the solid electrolyte layer (30) so that the lithium ions can be deposited on the negative electrode current collector (10).

[0051] To achieve the effect of the above functional layer (20), the above functional layer (20) can be formed with a thickness of 10㎛ to 30㎛.

[0052] The above functional layer (20) may include a material that forms an alloy or compound with lithium. Specifically, the above functional layer (20) may include amorphous carbon and a metal powder capable of alloying with lithium.

[0053] The above amorphous carbon may include carbon black such as acetylene black, furnace black, and Ketjen black; graphene; etc.

[0054] The metal powder may include at least one selected from the group consisting of gold (Au), platinum (Pt), palladium (Pd), silicon (Si), silver (Ag), aluminum (Al), bismuth (Bi), tin (Sn), zinc (Zn), and combinations thereof.

[0055] The functional layer (20) may further include a binder. The binder is configured to provide adhesion to the amorphous carbon, metal powder, etc. The binder may be BR (Butadiene rubber), NBR (Nitrile butadiene rubber), HNBR (Hydrogenated nitrile butadiene rubber), PVDF (polyvinylidene difluoride), PTFE (polytetrafluoroethylene), CMC (carboxymethylcellulose), etc. The binder included in the functional layer (20) may be the same as or different from that included in the anode layer (40).

[0056] The functional layer (20) may comprise 50% to 70% by weight of the amorphous carbon, 20% to 40% by weight of the metal powder, and 1% to 10% by weight of the binder.

[0057] The present invention is characterized by controlling the flow behavior of the binder within the functional layer (20) to reduce the difference in binding force between specific points within the functional layer (20). The 'binding force' refers to the degree of aggregation of each component of the functional layer (20).

[0058] If there is a large difference in binding force between specific points within the functional layer (20), the movement of lithium ions within it is not balanced. Consequently, lithium metal (Li) is not evenly deposited over the entire surface area of ​​the negative electrode current collector (10), and there is a high possibility that it will be deposited and grow intensively at the corners. The corners of the battery form an interface between a solid and a gas, and thus have a higher surface energy compared to the interior, which has an interface between solids. Therefore, if lithium ions do not move in a balanced manner, they move toward the corners to stabilize the thermodynamically high surface energy, and consequently, lithium metal (Li) is deposited at the corners.

[0059] In addition, the difference in the bonding force may increase the interfacial resistance between the functional layer (20) and the solid electrolyte layer (30), causing a problem in which lithium metal (Li) precipitates and grows between the functional layer (20) and the solid electrolyte layer (30) rather than between the functional layer (20) and the negative electrode current collector (10). If lithium precipitates between the functional layer (20) and the solid electrolyte layer (30), the lithium may penetrate the solid electrolyte layer (30), causing a short circuit in the battery.

[0060] FIG. 3 illustrates the functional layer (20). The functional layer (20) may include a first interface layer (21) on the side of the solid electrolyte layer (30) and a second interface layer (22) on the side of the negative current collector (10).

[0061] The present invention is characterized by the technical feature of solving the aforementioned problems by adjusting the ratio (b / a) of the binding force (a) of the first interface layer and the binding force (b) of the second interface layer to be 0.6 or higher. If the ratio (b / a) of the binding force is less than 0.6, as described above, problems may occur such as lithium metal (Li) precipitating and growing at the corner portions of the battery and precipitating and growing between the functional layer (20) and the solid electrolyte layer (30).

[0062] The bonding force of the first interface layer (21) and the second interface layer (22) can be obtained by using a Surface and Interfacial Cutting Analysis System (SAICAS) to cut at a certain depth from the surface of each interface layer (21, 22) and calculating the force applied to the Surface and Interfacial Cutting Analysis System (SAICAS) at that point.

[0063] FIG. 4 is a reference diagram for explaining the method of determining the bonding force using the surface-interface cutting analysis system (SAICAS). Referring to this, the surface of the functional layer (20) is cut using the initially set vertical force and horizontal force of the blade (A) equipped in the surface-interface cutting analysis system (SAICAS), and then at a specific depth, the vertical force of the blade (A) is reset to 0 so that the blade (A) moves only in the horizontal direction, and the horizontal force applied to the blade (A) at this time is converted into a bonding force.

[0064] The blade (A) can be beveled from the surface of the first interface layer (21) and the second interface layer (22) to a depth greater than 0 μm and less than or equal to 3 μm to obtain the bonding force (a) of the first interface layer (21) and the bonding force (b) of the second interface layer (22).

[0065] A functional layer (20) having a ratio (b / a) of the binding force (a) of the first interface layer and the binding force (b) of the second interface layer of 0.6 or more can be manufactured in the following manner.

[0066] The above functional layer (20) can be obtained through the steps of: preparing a slurry comprising amorphous carbon, metal powder and binder; applying the slurry onto a substrate; drying the applied product at a first temperature for a first time; and drying the product dried at a second temperature lower than the first temperature for a second time longer than the first time to form a functional layer.

[0067] By rapidly drying the surface of the coated product through the first drying step to suppress the movement of the binder, and then completing the drying of the entire product through the second drying step, the aforementioned ratio of binding strength (b / a) can be achieved.

[0068] If a rapid drying step such as the first drying step is not performed, the binder moves along with the gas vaporizing inside the coated product, so the binding force (b) of the second interface layer (22) decreases, and the ratio of binding force (b / a) is lowered.

[0069] The above first drying can be performed at 100°C to 140°C for 0.5 minutes to 5 minutes, and the above second drying can be performed at 80°C to 100°C for 10 minutes or less, or 1 minute to 10 minutes, or 2.5 minutes to 10 minutes.

[0070] Subsequently, a structure can be formed in which a negative electrode current collector (10), a functional layer (20), a solid electrolyte layer (30), a positive electrode layer (40), and a positive electrode current collector (50) are sequentially stacked to obtain an all-solid-state battery. At this time, the functional layer (20) may be formed separately and attached to the negative electrode current collector (10), or the slurry may be applied directly onto the negative electrode current collector (10) using the negative electrode current collector (10) as a substrate.

[0072] Other forms of the present invention will be described in more detail through the following examples. The following examples are merely illustrative to aid in understanding the present invention and do not limit the scope of the present invention.

[0074] Examples

[0075] A slurry containing amorphous carbon, metal powder, and a binder was applied onto a substrate and subjected to primary drying by applying hot air at 140°C for 0.5 minutes. Subsequently, a functional layer was obtained by subjecting it to secondary drying by applying hot air at 80°C for 2.5 minutes.

[0076] The bonding force (a) of the first interface layer obtained by the Surface-Interface Cutting Analysis System (SAICAS) was approximately 60 N / m, and the bonding force (b) of the second interface layer was approximately 40 N / m. That is, the ratio (b / a) of the bonding force of the functional layer according to the embodiment is 0.667.

[0078] Comparative example

[0079] A slurry containing amorphous carbon, metal powder, and a binder was applied onto a substrate, and a functional layer was obtained by applying hot air at 80°C for 5 minutes.

[0080] The bonding strength (a) of the first interface layer obtained by the Surface-Interface Cutting Analysis System (SAICAS) was approximately 125 N / m, and the bonding strength (b) of the second interface layer was approximately 67 N / m. That is, the ratio (b / a) of the bonding strength of the functional layer according to the comparative example is 0.536.

[0082] Experimental Example

[0083] A pouch-type all-solid-state battery having a stacked structure as shown in FIG. 1 was manufactured using the functional layer according to the above example and comparative example. Each all-solid-state battery was charged, and the precipitation pattern of lithium metal was observed. FIG. 5 shows the charging state of an all-solid-state battery according to the comparative example, and FIG. 6 shows the charging state of an all-solid-state battery according to the example. Referring to this, it can be seen that in the comparative example, lithium metal (Li) is precipitated near the corners, whereas in the example, no such phenomenon was observed at all.

[0085] As the experimental examples and embodiments of the present invention have been described in detail above, the scope of the present invention is not limited to the aforementioned experimental examples and embodiments, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also included within the scope of the present invention. Explanation of the symbols

[0086] 10: Cathode current collector 20: Functional layer 30: Solid electrolyte layer 40: Anode layer 50: Anode current collector 21: First interface layer 22: Second interface layer

Claims

Claim 1 A solid-state battery comprising: a negative electrode current collector; a functional layer comprising a material that forms an alloy or compound with lithium and is located on the negative electrode current collector; a solid electrolyte layer located on the functional layer; and an anode layer located on the solid electrolyte layer, wherein the functional layer comprises a first interface layer on the side of the solid electrolyte layer and a second interface layer on the side of the negative electrode current collector, wherein the ratio (b / a) of the bonding force (a) of the first interface layer and the bonding force (b) of the second interface layer is 0.6 or greater, and the bonding force of the first interface layer and the second interface layer is obtained by using a Surface and Interfacial Cutting Analysis System (SAICAS) to perform inclined cutting from the surface of each interface layer to a certain depth and converting the force applied to the Surface and Interfacial Cutting Analysis System at that point. Claim 2 An all-solid-state battery according to claim 1, wherein the material comprises amorphous carbon; and a metal powder capable of alloying with lithium, and the metal powder comprises at least one selected from the group consisting of gold (Au), platinum (Pt), palladium (Pd), silicon (Si), silver (Ag), aluminum (Al), bismuth (Bi), tin (Sn), zinc (Zn), and combinations thereof. Claim 3 In claim 1, the functional layer comprises a binder in an all-solid-state battery. Claim 4 An all-solid-state battery according to claim 1, wherein the thickness of the functional layer is 10㎛ to 30㎛. Claim 5 delete Claim 6 An all-solid-state battery according to claim 1, wherein the bonding force is obtained by bevel cutting the first interface layer and the second interface layer from the surface to a depth greater than 0 μm and less than or equal to 3 μm using the surface-interface cutting analysis system. Claim 7 A solid-state battery according to claim 1, wherein lithium metal is deposited between the functional layer and the negative current collector during charging of the solid-state battery. Claim 8 A method for manufacturing an all-solid-state battery comprising: a step of preparing a slurry comprising amorphous carbon, a metal powder capable of alloying with lithium, and a binder; a step of applying the slurry onto a substrate; a step of first drying the applied product at a first temperature for a first time; a step of second drying the first dried product at a second temperature lower than the first temperature for a second time longer than the first time to form a functional layer; and a step of obtaining a structure in which a negative electrode current collector, the functional layer, a solid electrolyte layer, and an anode layer are sequentially stacked, wherein the functional layer comprises a first interface layer on the side of the solid electrolyte layer and a second interface layer on the side of the negative electrode current collector, and the ratio (b / a) of the binding force (a) of the first interface layer and the binding force (b) of the second interface layer is 0.6 or greater. Claim 9 A method for manufacturing an all-solid-state battery according to claim 8, wherein the first drying is performed at 100°C to 140°C for 0.5 minutes to 5 minutes. Claim 10 A method for manufacturing an all-solid-state battery according to claim 8, wherein the secondary drying is performed at 80°C to 100°C for 10 minutes or less. Claim 11 A method for manufacturing an all-solid-state battery according to claim 8, wherein the thickness of the functional layer is 10㎛ to 30㎛. Claim 12 A method for manufacturing an all-solid-state battery according to claim 8, wherein the bonding force between the first interface layer and the second interface layer is obtained by using a Surface and Interfacial Cutting Analysis System (SAICAS) to perform inclined cutting from the surface of each interface layer to a certain depth and calculating the force applied to the Surface and Interfacial Cutting Analysis System at that point. Claim 13 A method for manufacturing an all-solid-state battery according to claim 12, wherein the bonding force is obtained by bevel cutting the first interface layer and the second interface layer from the surface to a depth greater than 0 μm and less than or equal to 3 μm using the surface-interface cutting analysis system.

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