Rechargeable lithium battery

Abstract

The invention relates to a rechargeable lithium battery. Some embodiments provide a rechargeable lithium battery including an electrode assembly wound about a winding axis and including: a positive electrode plate having a positive electrode uncoated portion and a positive electrode coated portion; a negative electrode plate having a negative electrode uncoated portion and a negative electrode coated portion; and a separator between the positive electrode plate and the negative electrode plate, in which the ceramic insulating film is on at least a portion of an uncoated portion of the positive electrode, the ceramic insulating film includes a ceramic and a binder, and a binder content (e.g., an amount) based on a total amount of the ceramic insulating film is greater than or equal to about 60 wt%.

Description

Technical Field

[0001] Embodiments of the present disclosure described herein relate to rechargeable lithium batteries. Background Art

[0002] Rechargeable lithium batteries are rechargeable, and have an energy density per unit weight that is three or more times higher than comparable lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, etc. Rechargeable lithium batteries can also be charged at a relatively high rate, and are therefore commercially manufactured for use in laptop computers, cellular phones, power tools, electric bicycles, etc., and research on improving additional energy density has been actively conducted and / or pursued.

[0003] One area of ​​research of interest relates to the insulating properties of rechargeable lithium batteries. In this regard, a ceramic insulating film may be applied to an uncoated portion of a positive electrode plate and / or a negative electrode plate of a rechargeable lithium battery, but is susceptible to brittle fracture due to its (e.g., ceramic) material properties. In particular, if (e.g., when) the rechargeable lithium battery is applied to a vehicle (e.g., an electric vehicle), the ceramic insulating film may be more easily detached due to vibration and / or movement of the electric vehicle. Summary of the invention

[0004] Aspects according to one or more embodiments relate to a rechargeable lithium battery in which brittle fracture may be suppressed or reduced even when (eg, when) a ceramic insulating film is applied to an uncoated portion of a positive electrode plate.

[0005] Aspects according to one or more embodiments relate to a rechargeable lithium battery that improves insulation characteristics of the rechargeable lithium battery by applying a ceramic insulating film to an uncoated portion of a positive electrode plate and suppresses brittle fracture by increasing a binder content (e.g., amount) in the ceramic insulating film.

[0006] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the embodiments presented in the disclosure.

[0007] According to one or more embodiments, a rechargeable lithium battery may include an electrode assembly that is wound around a winding axis and includes: a positive electrode plate having a positive electrode uncoated portion and a positive electrode coated portion; a negative electrode plate having a negative electrode uncoated portion and a negative electrode coated portion; and a separator between the positive electrode plate and the negative electrode plate, wherein a ceramic insulating film is on at least a portion of the positive electrode uncoated portion, the ceramic insulating film includes a ceramic and a binder, and the binder content (e.g., amount) based on the total amount of the ceramic insulating film is greater than or equal to about 60 wt %. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1is a schematic diagram of an electrode assembly according to some embodiments.

[0009] Figure 2 is a schematic diagram of a positive electrode plate according to some embodiments.

[0010] Figure 3 is a schematic diagram of a rechargeable lithium battery according to some embodiments.

[0011] Reference numerals

[0012] 100: Rechargeable lithium battery

[0013] 10: Positive electrode

[0014] 10a: Positive electrode coating part

[0015] 10b: Uncoated portion of the second positive electrode

[0016] 10c: Uncoated portion of the first positive electrode

[0017] 20: Negative electrode

[0018] 20a: Negative electrode coating part

[0019] 20b: Uncoated part of negative electrode

[0020] 30: Diaphragm

[0021] 40: Electrode assembly

[0022] 50: Shell

[0023] 60: Sealing component DETAILED DESCRIPTION

[0024] Hereinafter, a rechargeable lithium battery according to some embodiments will be described in more detail with reference to the accompanying drawings. However, these embodiments are examples, the present disclosure is not limited thereto, and the present disclosure is defined by the scope of the claims.

[0025] As used herein, expressions such as “at least one of,” “one of,” and “(e.g., selected from)…,” when preceding / following a list of elements, modify the entire list of elements and do not modify the individual elements of the list. For example, “at least one of a, b, and c,” “at least one selected from a, b, and c,” and the like may indicate only a, only b, only c, both a and b (e.g., simultaneously), both a and c (e.g., simultaneously), b and c (e.g., simultaneously), all of a, b, and c, or variations thereof.

[0026] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this disclosure have the same meaning as those commonly understood by those skilled in the art to which the disclosure belongs. In some embodiments, it will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the meaning in the context of the relevant field and the disclosure, and not interpreted in an ideal or overly formal sense, unless explicitly defined as such in this article.

[0027] Embodiments are described in the present disclosure with reference to cross-sectional views that are schematic diagrams of idealized embodiments. As such, variations in the shapes of the illustrations, for example due to manufacturing techniques and / or tolerances, can be expected. In some embodiments, the embodiments described in the present disclosure should not be construed as being limited to the specific shapes of the zones illustrated in the present disclosure, but may include shape deviations, for example, caused by manufacturing. For example, a zone illustrated or described as flat may typically be rough and / or have nonlinear features. Moreover, sharp corners may be rounded. In some embodiments, the zones illustrated in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of the zones, and are not intended to limit the scope of the claims.

[0028] However, the present disclosure may be embodied in different forms and should not be construed as being limited to the embodiments described in the present disclosure. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. The same reference numerals mark the same elements.

[0029] When an element is described as being "on" another element, it will be understood that the element may be directly disposed on the other element or another element may be interposed therebetween. On the other hand, when an element is described as being directly "on" another element, another element is not interposed therebetween.

[0030] It will be understood that although the terms "first", "second", and "third" may be used herein to describe one or more appropriate elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. In some embodiments, without departing from the teachings of this specification, the first element, component, region, layer, or portion described may be referred to as a second element, component, region, layer, or portion.

[0031] The terms used in this article are intended to describe only specific embodiments and are not intended to limit the present disclosure. As used in this article, the singular forms "a", "an" and "the" are intended to include plural forms, including "at least one", unless the content (e.g., amount) is clearly indicated in other ways. "At least one" should not be interpreted as being limited to the singular. As used in this article, the term "and / or" includes any and all combinations of one or more related enumerated items. The terms "includes", "including", "comprises" and / or "comprising" when used in the detailed description indicate the presence of narrated features, regions, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components and / or groups thereof.

[0032] Spatially relative terms such as "below," "below," "below," "above," and "on" may be used herein to easily describe the relationship of one element or feature to another element or feature. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation illustrated in the drawings. For example, when the device in the drawings is turned over, elements described as being "below" or "below" other elements or features will be "above" or "on" the other elements or features. In some embodiments, the example term "below" may encompass both orientations above and below (e.g., encompassing both orientations above and below). The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative terms used herein may be interpreted accordingly.

[0033] As used herein, the term "particle size" or "particle diameter" refers to the average diameter (e.g., diameter or size of a crystal, cross-sectional diameter or size of a tube, etc.) when the particles are spherical (or round), and refers to the average major axis length when the particles are non-spherical (or non-round). The particle size can be measured by using a particle size analyzer (PSA). "Particle size" or "particle diameter" is, for example, the average particle diameter. "Average particle diameter (D 50 )" refers to, for example, the median particle size.

[0034] D 50 Refers to a particle size corresponding to 50% cumulative volume if (for example, when) a particle size distribution measured by a laser diffraction method is calculated starting from particles having a smaller particle size.

[0035] D 90 Refers to a particle size corresponding to 90% of the cumulative volume if (for example, when) a particle size distribution measured by a laser diffraction method is calculated starting from particles having a smaller particle size.

[0036] D 10 Refers to a particle size corresponding to about 10% cumulative volume if (for example, when) a particle size distribution measured by a laser diffraction method is calculated starting from particles having a smaller particle size.

[0037] As used herein, the term "metal" includes all metals and metalloids, such as silicon and germanium, in either elemental or ionic form.

[0038] The term "alloy" as used herein refers to a mixture of two or more metals.

[0039] As used herein, the term "electrode active material" refers to an electrode material that can undergo lithiation and delithiation.

[0040] As used herein, the term "positive electrode active material" refers to a positive electrode material that can undergo lithiation and delithiation.

[0041] The term "negative electrode active material" as used herein refers to a negative electrode material that can undergo lithiation and delithiation.

[0042] As used herein, the terms "lithiate" and "lithiating" refer to the process of adding lithium to an electrode active material.

[0043] As used herein, the terms "delithiate" and "delithiating" refer to the process of removing lithium from an electrode active material.

[0044] As used herein, the terms "charge" and "charging" refer to the process of providing electrochemical energy to a battery.

[0045] As used herein, the terms "discharge" and "discharging" refer to the process of removing electrochemical energy from a battery.

[0046] The terms "positive electrode" and "cathode" as used herein refer to the electrode that undergoes electrochemical reduction and lithiation during the discharge process.

[0047] The terms "negative electrode" and "anode" as used herein refer to the electrode at which electrochemical oxidation and delithiation occur during the discharge process.

[0048] As used herein, the term "substantially" and similar terms are used as terms of approximation, not as terms of degree, and are intended to account for the inherent deviations in measured or calculated values ​​that one of ordinary skill in the art would recognize. Also, the term "about" and similar terms, when used herein in conjunction with a value or range of values, include the stated value as well as values ​​within an acceptable range of deviation of the particular value as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (e.g., limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, or ±5% of the stated value.

[0049] Furthermore, any numerical range set forth herein is intended to include all sub-ranges of the same numerical precision falling within the set forth range. For example, the range of "1.0-10.0" is intended to include between the set forth minimum value 1.0 and the set forth maximum value 10.0 (and including the end value), that is, all sub-ranges with a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as, for example, 2.4-7.6. Any maximum numerical limit set forth herein is intended to include all lower numerical limits falling therein, and any minimum numerical limit set forth in this specification is intended to include all higher numerical limits falling therein. Accordingly, the applicant reserves the right to modify this specification (including claims) to explicitly set forth any sub-range falling within the range explicitly set forth herein.

[0050] As mentioned above, one of the recent development directions of rechargeable lithium batteries involves insulation properties. In this regard, it can be considered to apply a ceramic insulating film to the uncoated portion of the electrode plate of the rechargeable lithium battery, but the ceramic insulating film is prone to brittle fracture due to its material properties. In particular, if (for example, when) the rechargeable lithium battery is applied to a vehicle (for example, an electric vehicle), the phenomenon of ceramic insulating film falling off may become more serious due to the vibration and movement of the electric vehicle.

[0051] The rechargeable lithium battery of one or more embodiments of the present disclosure improves the insulation characteristics of the rechargeable lithium battery by applying a ceramic insulating film to the uncoated portion of the electrode plate, and suppresses or reduces brittle fracture by increasing the binder content (e.g., amount) in the ceramic insulating film.

[0052] For example, some embodiments provide a rechargeable lithium battery including an electrode assembly wound around a winding axis and including:

[0053] a positive electrode plate having a positive electrode uncoated portion and a positive electrode coated portion;

[0054] a negative electrode plate having a negative electrode uncoated portion and a negative electrode coated portion; and

[0055] The separator between the positive electrode plate and the negative electrode plate,

[0056] wherein the ceramic insulating film is on at least a portion of the uncoated portion of the positive electrode,

[0057] The ceramic insulating film includes ceramic and a binder, and

[0058] The binder content (eg, amount) based on the total amount of the ceramic insulating film is greater than or equal to about 60 wt %.

[0059] As used herein, the “uncoated portion” refers to a portion on a current collector where an electrode active material layer is not formed, and the “coated portion” refers to a portion on a current collector where an electrode active material layer is formed.

[0060] Hereinafter, a rechargeable lithium battery according to some embodiments will be described in more detail.

[0061] Binder content in ceramic insulating film

[0062] When the binder content (eg, amount) in the ceramic insulating film increases, the ion conductivity of the ceramic insulating film may decrease, but adhesion of the ceramic insulating film to the uncoated portion of the positive electrode is improved.

[0063] However, the ceramic insulating film is on at least a portion of the uncoated portion of the positive electrode and is used only for “insulating properties” (eg, insulation of electrons), and “ionic conductivity” is not considered here.

[0064] Accordingly, it is desirable to increase the binder content (eg, amount) in the ceramic insulating film to suppress or reduce brittle fracture and peeling of the ceramic insulating film.

[0065] For example, if (eg, when) the binder content (eg, amount) based on the total amount of the ceramic insulating film is less than about 60 wt %, brittle fracture and peeling of the ceramic insulating film become more serious.

[0066] In contrast, if (for example, when) the binder content (for example, amount) based on the total amount of the ceramic insulating film is greater than or equal to about 60 wt %, greater than or equal to about 70 wt %, or greater than or equal to about 80 wt %, the brittle fracture and peeling of the ceramic insulating film are suppressed or reduced. The upper limit is not particularly limited, but the binder content (for example, amount) based on the total amount of the ceramic insulating film may be less than or equal to about 99 wt %, less than or equal to about 95 wt %, or less than or equal to about 90 wt %.

[0067] ceramics

[0068] The ceramic is not particularly limited as long as it is a material that can provide insulating properties to the ceramic insulating film, but may also be Al 2 O 3、SiO 2 、TiO 2 SnO 2 、CeO 2 , MgO, NiO, CaO, GaO, ZnO, ZrO 2 , Y 2 O 3 、SrTiO 3 、BaTiO 3 Mg(OH) 2 , boehmite and / or any suitable combination thereof.

[0069] Binder

[0070] The binder is used to bond the ceramics to each other and to bond the ceramics to the uncoated portion of the positive electrode. The binder may be polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylic resin, polyester resin, nylon and / or any suitable combination thereof.

[0071] Electrode assembly structure

[0072] Figure 1 is a schematic diagram of an electrode assembly according to some embodiments.

[0073] The electrode assembly may be an electrode assembly wound around a winding axis A.

[0074] In addition to the positive electrode coated portion 10a, the positive electrode uncoated portions 10b and 10c are located at the long side ends of the positive electrode plate 10 from the winding front end (e.g., the beginning of winding) of the positive electrode plate 10 to the winding end, and are exposed to the upper portion of the separator 30; and the negative electrode uncoated portion 20b is also located at the long side ends of the negative electrode plate 20 from the winding front end (e.g., the beginning of winding) of the negative electrode plate 20 to the winding end, and is exposed to the lower portion of the separator 30.

[0075] For example, the positive electrode uncoated portions 10 b and 10 c are exposed at the upper portion of the separator 30 at the top; and the negative electrode uncoated portion 20 b may be exposed at the lower portion of the separator 30 at the bottom except for the negative electrode coated portion 20 a.

[0076] Figure 2 is a schematic diagram of a positive electrode plate according to some embodiments.

[0077] The positive electrode uncoated portion may include a first positive electrode uncoated portion 10c serving as a positive electrode tab and a second positive electrode uncoated portion 10b not serving as an electrode tab, and the ceramic insulating film may be disposed on the second uncoated portion 10b.

[0078] Since the ceramic insulating film on the second uncoated portion 10b is wound around the winding axis A (see Figure 1 ) is wound, so in order to suppress or reduce the brittle fracture and peeling of the ceramic insulating film, it is important to increase the binder content (e.g., amount) in the ceramic insulating film.

[0079] The first positive electrode uncoated portion 10c may be folded after being grooved to be used as a positive electrode. In the grooved and folded first positive electrode uncoated portion 10c, it is also important to increase the binder content (eg, amount) in the ceramic insulating film.

[0080] The length and width of the positive electrode uncoated portions 10b and 10c may satisfy Equation 1:

[0081] Equation 1

[0082] 1.0×10 -3 ≤W 1 / L 1 ≤2.0×10 -3

[0083] In equation 1, L 1 is the length of the positive electrode plate 10, W 1 is the width of the positive electrode uncoated portions 10b and 10c.

[0084] For example, Equation 1 may have a value of approximately 1.1×10 -3 , about 1.2×10 -3 or about 1.3×10 -3 The lower limit is about 2.0×10 -1 , about 1.8×10 -1 or about 1.7×10 -1 upper limit.

[0085] When Equation 1 is satisfied, an electrode assembly may be formed.

[0086] The widths of the positive electrode uncoated portions 10b and 10c and the width of the positive electrode coated portion 10a may satisfy Equation 2:

[0087] Equation 2

[0088] 0.09≤W 1 / W 2 ≤0.13

[0089] In Equation 2, W 1is the width of the positive electrode uncoated portions 10b and 10c; and W 2 is the width of the positive electrode coating portion 10a.

[0090] For example, Equation 2 may have a lower limit of about 0.092, about 0.094, or about 0.096 and an upper limit of about 0.128, about 0.126, or about 0.124.

[0091] When Equation 2 is satisfied, an electrode assembly may be formed.

[0092] The width of the first positive electrode uncoated portion 10c and the width of the second positive electrode uncoated portion 10b may satisfy Equation 3:

[0093] Equation 3

[0094] 0.85≤W 11 / W 12 ≤0.90

[0095] In Equation 3, W 11 is the width of the first positive electrode uncoated portion 10c; and W 12 is the width of the second positive electrode uncoated portion 10b.

[0096] For example, Equation 3 may have a lower limit of about 0.852, about 0.854, or about 0.856 and an upper limit of about 0.898, about 0.896, or about 0.894.

[0097] When Equation 3 is satisfied, an electrode assembly may be formed.

[0098] case

[0099] Rechargeable lithium batteries may be classified into a cylindrical type or cylindrical type, a prismatic type or prismatic type, a pouch type or pouch type, a coin type or coin type, etc., according to a case shape.

[0100] The rechargeable lithium battery of some embodiments may further include a cylindrical can accommodating the electrode assembly.

[0101] Figure 3 Schematic diagram showing a rechargeable lithium battery according to some embodiments, which is a cylindrical rechargeable lithium battery. Figure 3 , the cylindrical rechargeable lithium battery 100 may include an electrode assembly 40 formed by inserting a separator 30 between a positive electrode 10 and a negative electrode 20, and a case 50 accommodating the electrode assembly 40. Figure 3 In FIG. 1 , two separators 30 are shown, with the positive electrode 10 interposed therebetween. The positive electrode 10, the negative electrode 20 and the separator 30 may be immersed in an electrolyte solution. Figure 3 As shown in , the rechargeable lithium battery 100 may further include a sealing member 60 that seals the case 50 .

[0102] In particular, if (e.g., when) the rechargeable lithium battery is applied to an electric vehicle, the ceramic insulating film may be more severely peeled off by the vibration and movement of the electric vehicle. However, some embodiments of the rechargeable lithium battery can suppress or reduce brittle fracture due to the high binder content (e.g., amount) in the ceramic insulating film even when applied to an electric vehicle.

[0103] The cylindrical tank of the electric vehicle may have a diameter of about 145 cm 3 ~Approximately 146cm 3 volume, but as the total height of the battery cell increases, the cylindrical can can have a volume of about 145cm 3 ~Approximately 183cm 3 volume.

[0104] Positive electrode active material

[0105] The positive electrode active material may be a compound capable of inserting and extracting lithium (lithiated inserting compound). For example, a composite oxide of lithium and one or more types (species) of metals (e.g., selected from) cobalt, manganese, nickel and / or any appropriate combination thereof may be used.

[0106] The composite oxide may be a lithium transition metal composite oxide, and specific examples may include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, cobalt-free lithium nickel manganese-based oxides, and / or any appropriate combination thereof.

[0107] As an example, based on about 100 mol% of the metal other than lithium in the lithium transition metal composite oxide, the positive electrode active material may be a high nickel-based positive electrode active material having a nickel content (e.g., amount) greater than or equal to about 80 mol%. Based on about 100 mol% of the metal other than lithium, the nickel content (e.g., amount) in the high nickel-based positive electrode active material may be greater than or equal to about 85 mol%, greater than or equal to about 90 mol%, greater than or equal to about 91 mol%, or greater than or equal to about 94 mol%, and less than or equal to about 99 mol%. High nickel-based positive electrode active materials can achieve high capacity and can be applied to high-capacity, high-density rechargeable lithium batteries.

[0108] In some embodiments, a compound represented by any one of the following chemical formulas may be used: Li a A 1- b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O4-c D c (0.90≤a≤1.8,0≤b≤0.5,0≤c≤0.05);Li a Ni 1-b-c Co b X c O 2-α D α (0.90≤a≤1.8,0≤b≤0.5,0≤c≤0.5,0<α<2);Li a Ni 1-b-c Mr b X c O 2-α D α (0.90≤a≤1.8,0≤b≤0.5,0≤c≤0.5,0<α<2);Li a Ni b Co c L 1 d G e O 2 (0.90≤a≤1.8,0≤b≤0.9,0≤c≤0.5,0≤d≤0.5,0≤e≤0.1);Li a NiG b O 2 (0.90≤a≤1.8,0.001≤b≤0.1);Li a CoG b O 2 (0.90≤a≤1.8,0.001≤b≤0.1);Li a Mr 1-b G b O 2 (0.90≤a≤1.8,0.001≤b≤0.1);Li a Mr 2 G b O 4 (0.90≤a≤1.8,0.001≤b≤0.1);Li a Mr 1-g G g NIGHT 4 (0.90≤a≤1.8,0≤g≤0.5);Li (3-f) Feb 2 (NIGHT 4 ) 3 (0≤f≤2);Li a FePO 4 (0.90≤a≤1.8)。

[0109] In the above chemical formula, A is Ni, Co, Mn and / or any suitable combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element and / or any suitable combination thereof; D is O, F, S, P and / or any suitable combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V and / or any suitable combination thereof; L 1 is Mn, Al and / or any suitable combination thereof.

[0110] For example, the positive electrode active material may include a cobalt-free lithium nickel manganese-based oxide.

[0111] As used herein, the cobalt-free lithium nickel manganese-based oxide as a positive electrode active material refers to a positive electrode active material composed of nickel, manganese, etc. as main components, and does not contain cobalt in the composition of the positive electrode active material.

[0112] As an example, the cobalt-free lithium nickel manganese-based oxide may include at least one type or kind of the lithium composite oxide represented by Chemical Formula 2.

[0113] Chemical formula 2

[0114] Li a Ni x Mn y M 1 z M 2 w O 2±b X c

[0115] In chemical formula 2,

[0116] 0.5≤a<1.8,0≤b≤0.1,0≤c≤0.1,0≤w<0.1,0.6≤x<1.0,0 <y<0.4,0<z<0.1,w+x+y+z=1,

[0117] M 1 and M 2 Each may independently be (for example, selected from) one or more elements of Al, Mg, Ti, Zr, Cr, Sr, V, B, W, Mo, Nb, Si, Ba, Ca, Ce, Cr, Fe and Nb, and X may be (for example, selected from) one or more elements of S, F, P and Cl.

[0118] As an example, Chemical Formula 2 may be represented by Chemical Formula 2-1.

[0119] Chemical formula 2-1

[0120] Li a Ni x1 Mn y1 Alz1 M 2 w1 O 2±b X c

[0121] In Chemical Formula 2-1,

[0122] 0.5 ≤ a < 1.8, 0 ≤ b ≤ 0.1, 0 ≤ c ≤ 0.1, 0.6 ≤ x1 < 1.0, 0 < y1 ≤ 0.4, 0 < z1 ≤ 0.1, 0 < w1 ≤ 0.1, w1 + x1 + y1 + z1 = 1,

[0123] M 2 is one or more elements selected from, for example, Mg, Ti, Zr, Cr, Sr, V, B, W, Mo, Nb, Si, Ba, Ca, Ce, Cr, Fe, and Nb, and X is one or more elements selected from, for example, F, P, and Cl.

[0124] In Chemical Formula 2-1, 0.6 ≤ x1 ≤ 0.9, 0.1 ≤ y1 ≤ 0.4, 0 ≤ z1 ≤ 0.1, and 0 < w1 ≤ 0.1, or 0.6 ≤ x1 ≤ 0.8, 0.2 ≤ y1 ≤ 0.4, 0 ≤ z1 ≤ 0.1, and 0 < w1 ≤ 0.1.

[0125] For example, in Chemical Formula 2-1, 0.6 ≤ x1 ≤ 0.79, 0.2 ≤ y1 ≤ 0.39, and 0.01 ≤ z1 < 0.1.

[0126] Positive electrode

[0127] The positive electrode for a rechargeable lithium battery may include a positive electrode current collector and a positive electrode active material layer on the positive electrode current collector. The positive electrode active material layer may include a positive electrode active material and may further include a binder and / or a conductive material.

[0128] Based on about 100 wt% of the positive electrode active material layer, the content (e.g., amount) of the positive electrode active material may be about 90 wt% to about 99.5 wt%.

[0129] In some embodiments, the positive electrode active material layer may further include a binder and a conductive material. Herein, based on about 100 wt% of the positive electrode active material layer, the contents (e.g., amounts) of the binder and the conductive material may be about 0.5 wt% to about 5 wt%, respectively.

[0130] The binder is used to adhere the positive electrode active material particles to each other well, and also to adhere the positive electrode active material to the positive electrode current collector well. Examples of the binder may include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth) acrylated styrene-butadiene rubber, epoxy resin, (meth) acrylic resin, polyester resin, nylon and / or any suitable combination thereof, but are not limited thereto.

[0131] Conductive materials can be used to impart conductivity (e.g., electrical conductivity) to electrodes. Any material that does not cause chemical changes (e.g., does not cause undesirable chemical changes in a rechargeable lithium battery) and conducts electrons can be used for a rechargeable lithium battery. Examples of conductive materials may include carbon-based materials (such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, and carbon nanotubes); metal-based materials including metal powders or metal fibers (e.g., in the form of metal powders or metal fibers) of copper, nickel, aluminum, silver, etc.; conductive polymers (such as polyphenylene derivatives); or mixtures thereof.

[0132] Al foil may be used as a positive electrode current collector, but the present disclosure is not limited thereto.

[0133] Negative electrode active material

[0134] The negative electrode active material may be a material that reversibly intercalates / deintercalates lithium ions, lithium metal, a lithium metal alloy, a material capable of doping / dedoping lithium, or a transition metal oxide.

[0135] The material that can reversibly intercalate / deintercalate lithium ions may include a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon, and / or any suitable combination thereof. The crystalline carbon may be graphite, such as natural graphite or artificial graphite in an irregular shape, flake, sheet, spherical or fibrous form. The amorphous carbon may be soft carbon, hard carbon, a mesophase pitch carbonization product, calcined coke, etc.

[0136] The lithium metal alloy may include lithium and a metal (e.g., selected from) Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al and / or Sn.

[0137] The material capable of being doped / undoped with lithium may be a Si-based negative electrode active material or a Sn-based negative electrode active material. The Si-based negative electrode active material may include silicon, a silicon-carbon composite (Si-C composite), SiO x(0 < x < 2), Si-Q alloy (where Q is (e.g., selected from) alkali metals, alkaline earth metals, Group 13 elements, Group 14 elements (excluding Si), Group 15 elements, Group 16 elements, transition metals, rare earth elements, and / or any suitable combination thereof, such as Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Pb, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, Sn, In, Tl, Ge, P, As, Sb, Bi, S, Se, Te, Po, and / or any suitable combination thereof). The Sn-based negative electrode active material may include Sn, SnO 2 , Sn alloy, and / or any suitable combination thereof.

[0138] The silicon-carbon composite may be a composite of silicon and amorphous carbon. The average particle size (D 50 ) of the silicon-carbon composite particles may be, for example, about 0.5 micrometers (μm) to about 20 μm. According to some embodiments, the silicon-carbon composite may include silicon particles and amorphous carbon coated on the surface of the silicon particles (e.g., in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles). For example, the silicon-carbon composite may include secondary particles (cores) in which primary silicon particles are aggregated and an amorphous carbon coating (shell) on the surface of the secondary particles. The amorphous carbon may also be between the primary silicon particles. For example, the primary silicon particles may be coated with amorphous carbon. The secondary particles may be dispersed in the amorphous carbon matrix.

[0139] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include: a core including crystalline carbon and silicon particles and an amorphous carbon coating on the surface of the core. The crystalline carbon may be artificial graphite, natural graphite, and / or any suitable combination thereof. The amorphous carbon may include soft carbon or hard carbon, mesophase pitch carbonization products (e.g., coal pitch), and calcined coke.

[0140] When the silicon-carbon composite includes silicon and amorphous carbon, based on about 100 wt% of the silicon-carbon composite, the content (e.g., amount) of silicon may be about 10 wt% to about 50 wt%, and the content (e.g., amount) of amorphous carbon may be about 50 wt% to about 90 wt%. In one or more embodiments, if (e.g., when) the silicon-carbon composite includes silicon, amorphous carbon, and crystalline carbon, based on about 100 wt% of the silicon-carbon composite, the content (e.g., amount) of silicon may be about 10 wt% to about 50 wt%, the content (e.g., amount) of crystalline carbon may be about 10 wt% to about 70 wt%, and the content (e.g., amount) of amorphous carbon may be about 20 wt% to about 40 wt%.

[0141] In addition, the thickness of the amorphous carbon coating can be from about 5 nm to about 100 nm. The average particle diameter (D 50 ) of the silicon particles (primary particles) can be from about 10 nm to about 1 μm or from about 10 nm to about 200 nm. The silicon particles can be present as elemental silicon, a silicon alloy (e.g., in the form of a silicon alloy), or silicon oxide (e.g., in an oxidized form). The oxidized form of silicon can be represented by SiO x (0 < x < 2). In some embodiments, the atomic content (e.g., amount) ratio of Si:O indicating the degree of oxidation can be from about 99:1 to about 33:67. As used herein, if (e.g., when) no other definition is provided otherwise, the average particle diameter (D 50 ) indicates the diameter of the particles in the particle distribution with a cumulative volume of about 50 vol%.

[0142] Si-based negative electrode active materials or Sn-based negative electrode active materials can be used in combination with carbon-based negative electrode active materials. If a mixture of Si-based negative electrode active materials or Sn-based negative electrode active materials and carbon-based negative electrode active materials is used, the mixing ratio can be from about 1:99 to about 90:10 by weight.

[0143] Negative electrode

[0144] The negative electrode for a rechargeable lithium battery includes a negative electrode current collector and a negative electrode active material layer on the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material and can further include a binder and / or a conductive material.

[0145] Based on about 100 wt% of the negative electrode active material layer, the content (e.g., amount) of the negative electrode active material can be from about 95 wt% to about 99.5 wt%. Based on about 100 wt% of the negative electrode active material layer, the content (e.g., amount) of the binder can be from about 0.5 wt% to about 5 wt%. Based on about 100 wt% of the negative electrode active material layer, the content (e.g., amount) of the conductive material can be from about 0.5 wt% to about 5 wt%. For example, the negative electrode active material layer can include from about 90 wt% to about 99 wt% of the negative electrode active material, from about 0.5 wt% to about 5 wt% of the binder, and from about 0.5 wt% to about 5 wt% of the conductive material.

[0146] The binder can be used to adhere the negative electrode active material particles well to each other and also adhere the negative electrode active material well to the negative electrode current collector. The binder can include a non-aqueous binder, an aqueous binder, a dry binder, and / or any suitable combination thereof.

[0147] The non-aqueous binder may include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamideimide, polyimide, and / or any suitable combination thereof.

[0148] The aqueous binder may be (for example, selected from) styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinyl pyrrolidone, polyepichlorohydrin, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinyl pyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenol resin, epoxy resin, polyvinyl alcohol and / or any suitable combination thereof.

[0149] When the aqueous binder is used as the negative electrode binder, it may further include a cellulose compound capable of imparting viscosity. The cellulose compound includes one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose and alkali metal salts thereof. The alkali metal may be Na, K or Li.

[0150] The dry binder may be a polymer material capable of fiberization, and may be, for example, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, and / or any appropriate combination thereof.

[0151] A conductive material is included to provide electrode conductivity, and any conductive material can be used as the conductive material unless it causes a chemical change. Examples of the conductive material may be carbon-based materials (such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc.); metal-based materials including copper, nickel, aluminum, silver, etc. in the form of metal powder or metal fiber; conductive polymers (such as polyphenylene derivatives); or mixtures thereof.

[0152] The negative electrode current collector may include (eg, selected from) one of copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, and any appropriate combination thereof, but the present disclosure is not limited thereto.

[0153] Diaphragm

[0154] Depending on the type of the rechargeable lithium battery, the rechargeable lithium battery may further include a separator between the negative electrode and the positive electrode. Examples of suitable separator materials include polyethylene, polypropylene, polyvinylidene fluoride, and multilayers thereof (such as polyethylene / polypropylene double-layer separator, polyethylene / polypropylene / polyethylene three-layer separator, and polypropylene / polyethylene / polypropylene three-layer separator).

[0155] The separator may include a porous substrate and a coating on a surface or side (eg, one or both surfaces (eg, opposing surfaces)) of the porous substrate, the coating including an organic material, an inorganic material, and / or any suitable combination thereof.

[0156] The porous substrate may be a polymer film formed from (for example, selected from) any one of a polymer of polyolefin (such as polyethylene or polypropylene), polyester (such as polyethylene terephthalate or polybutylene terephthalate), polyacetal, polyamide, polyimide, polycarbonate, polyether ketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, polyethersulfone, polyphenylene ether, cyclic olefin copolymer, polyphenylene sulfide, polyethylene naphthalate, glass fiber, TEFLON (tetrafluoroethylene) and polytetrafluoroethylene, and / or a polymer film formed from copolymers and / or mixtures of two or more thereof.

[0157] The porous substrate may have a thickness of about 1 μm to about 40 μm (eg, about 1 μm to about 30 μm, about 1 μm to about 20 μm, about 5 μm to about 15 μm, or about 10 μm to about 15 μm).

[0158] The organic material may include a (meth)acrylic copolymer including a first structural unit derived from (meth)acrylamide and a second structural unit including at least one of a structural unit derived from (meth)acrylic acid or (meth)acrylate and a structural unit derived from (meth)acrylamide sulfonic acid or a salt thereof.

[0159] The inorganic material may include (for example, selected from) Al 2 O 3 、SiO 2 、TiO 2 SnO 2 、CeO 2 , MgO, NiO, CaO, GaO, ZnO, ZrO 2 , Y 2 O 3 、SrTiO 3 、BaTiO 3 Mg(OH) 2 , boehmite and / or any suitable combination thereof, but the present disclosure is not limited thereto. The average particle size (D 50 ) may be from about 1 nm to about 2000 nm, for example, from about 100 nm to about 1000 nm or from about 100 nm to about 700 nm.

[0160] An organic material and an inorganic material may be mixed in one coating layer, or a coating layer including an organic material and a coating layer including an inorganic material may be stacked.

[0161] The coating layer may have a thickness of about 0.5 μm to about 20 μm, for example, about 1 μm to about 10 μm or about 1 μm to about 5 μm.

[0162] Non-aqueous organic solvent

[0163] The nonaqueous organic solvent serves as a medium for transporting ions participating in the electrochemical reaction of the battery.

[0164] The non-aqueous organic solvent may be a carbonate solvent, an ester solvent, an ether solvent, a ketone solvent, an alcohol solvent, an aprotic solvent and / or any appropriate combination thereof.

[0165] Carbonate solvents may include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), etc. Ester solvents may include methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, decanoic acid lactone, mevalonate lactone, valerolactone, caprolactone, etc. Ether solvents may include dibutyl ether, tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ether, dimethoxyethane, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, tetrahydrofuran, etc. In addition, ketone solvents may include cyclohexanone. Alcohol solvents may include ethanol, isopropanol, etc., and aprotic solvents may include nitriles (such as R-CN, where R is a C2-C20 straight chain, branched or cyclic hydrocarbon group, including a double bond, an aromatic ring or an ether group), amides (such as dimethylformamide), dioxolanes (such as 1,3-dioxolane or 1,4-dioxolane), sulfolane, etc.

[0166] The nonaqueous organic solvent may be used alone or in mixture of two or more, and if (eg, when) used in combination with two or more thereof, the mixing ratio may be appropriately adjusted according to desired or appropriate battery performance, as is well known to those skilled in the art.

[0167] In one or more embodiments, if (for example, when) using carbonate solvent, it is desirable to use only linear carbonate, excluding cyclic carbonate (not including cyclic carbonate), but a mixture of cyclic carbonate and linear carbonate can be used, and in the latter case, cyclic carbonate and linear carbonate can be mixed with a volume ratio of about 1: 1 to about 1: 9. For example, non-aqueous organic solvent can include ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) and / or any suitable combination thereof.

[0168] The non-aqueous organic solvent may further include an aromatic hydrocarbon organic solvent. For example, a carbonate-based solvent and an aromatic hydrocarbon organic solvent may be mixed and used in a volume ratio of about 1:1 to about 30:1.

[0169] Lithium salts

[0170] The lithium salt dissolved in the non-aqueous organic solvent supplies lithium ions in the battery, ensures the basic operation of the rechargeable lithium battery, and improves the transport of lithium ions between the positive electrode and the negative electrode. Examples of the lithium salt may include (e.g., selected from) LiPF 6 , LiBF 4 、LiSbF 6 、LiAsF 6 、LiClO 4 、LiAlO 2 、LiAlCl 4 、LiPO 2 F 2 、LiCl、LiI、LiN(SO 3 C 2 F 5 ) 2 、Li(FSO 2 ) 2 N(lithium bis(fluorosulfonyl)imide, LiFSI), LiC 4 F 9 SO 3 、LiN(C x F 2x+1 SO 2 )(C y F 2y+1 SO 2 )(x and y are integers of 1 to 20), one or more of lithium trifluoromethanesulfonate, lithium tetrafluoroethanesulfonate, lithium difluorobis(oxalato)phosphate (LiDFOB) and lithium bis(oxalato)borate (LiBOB).

[0171] The concentration of the lithium salt may be in the range of about 0.1 M to about 2.0 M. When the lithium salt concentration is within the above range, the electrolyte has appropriate or suitable ion conductivity and viscosity, and thus excellent or suitable performance may be achieved, and lithium ions may be efficiently moved.

[0172] Hereinafter, examples and comparative examples of the present disclosure are described. However, these examples are not to be construed as limiting the scope of the present disclosure in any sense.

[0173] Examples and Comparative Examples

[0174] Example 1

[0175] 1. Manufacturing of positive electrode plate

[0176] Prepare a 1 )×width(W 1 +W 2)×thickness=about 4688mm×about 72.5mm×about 0.01mm aluminum foil, and as Figure 2 As shown in FIG. 1 , the positive electrode is divided into a first positive electrode uncoated portion 10 c , a second positive electrode uncoated portion 10 b , and a positive electrode coated portion 10 a .

[0177] For example, starting from the long end of the aluminum foil, divide the aluminum foil into width (W 1 ) is about 7.5 mm of the positive electrode uncoated portion and width (W 2 The positive electrode uncoated portion is divided into a positive electrode coated portion 10a with a width (W) of about 65 mm starting from the long end of the aluminum foil. 11 ) is about 3.5 mm in width and the first positive electrode uncoated portion 10c has a width (W 12 ) is a second positive electrode uncoated portion 10b of about 4.0 mm.

[0178] The positive electrode active material LiNi 0.75 Mn 0.23 Al 0.02 O 2 , a binder polyvinylidene fluoride and a conductive material acetylene black were mixed in a weight ratio of about 96:3:1 and then dispersed in N-methylpyrrolidone to prepare a positive electrode active material slurry. Subsequently, the positive electrode active material slurry was coated on the positive electrode coating portion 10a.

[0179] And, by making the ceramic alumina (Al 2 O 3 ) and a binder polyvinylidene fluoride were mixed at a weight ratio of 40:60 and the mixture was dispersed in N-methylpyrrolidone to prepare a ceramic insulating film slurry. Subsequently, the ceramic insulating film slurry was coated on the second positive electrode uncoated portion 10b.

[0180] Then, drying was performed at about 100° C. and pressing was performed to manufacture a positive electrode.

[0181] 2. Fabrication of negative electrode

[0182] A copper foil having a length×width×thickness=about 4790 mm×about 73.5 mm×about 0.01 mm was prepared and then divided into a negative electrode uncoated portion and a negative electrode coated portion.

[0183] For example, from the long end of the copper foil, the copper foil is divided into a negative electrode uncoated portion having a width of about 5.5 mm and a negative electrode coated portion having a width of about 68 mm.

[0184] After preparing a negative electrode active material by mixing artificial graphite and Si-C composite in a weight ratio of about 93:7, the negative electrode active material was mixed with a styrene-butadiene rubber binder and carboxymethyl cellulose in a weight ratio of about 98:1:1, and then dispersed in distilled water to prepare a negative electrode active material slurry.

[0185] Herein, the Si—C composite has a core including artificial graphite and silicon particles, and coal tar pitch coated on the surface of the core.

[0186] The negative electrode active material slurry was coated on the negative electrode coating portion, and then dried at about 100° C. and pressed to manufacture a negative electrode.

[0187] 3. Manufacturing of electrode assemblies and rechargeable lithium battery cells

[0188] like Figure 1 , a polyethylene separator of about 10 μm thick is arranged between the positive electrode and the negative electrode to be assembled together. For example, the electrode assembly is manufactured by winding the positive electrode and the negative electrode with the separator therebetween, while exposing the positive electrode uncoated portions 10b and 10c at the upper portion of the separator 30, and exposing the negative electrode uncoated portion 20b at the lower portion of the separator 30.

[0189] The electrode assembly was placed in a volume of about 146 cm 3 A cylindrical can is formed by mixing ethylene carbonate (EC) and dimethyl carbonate (DMC) in a volume ratio of about 3:7 and adding about 1M LiPF 6 Dissolve in a non-aqueous organic solvent to prepare an electrolyte solution.

[0190] Example 2

[0191] The electrode assembly and the rechargeable lithium battery cell were manufactured in substantially the same manner as in Example 1, except that alumina (Al 2 O 3 ) and polyvinylidene fluoride as a binder are mixed in a weight ratio of about 30:70.

[0192] Example 3

[0193] The electrode assembly and the rechargeable lithium battery cell were manufactured in substantially the same manner as in Example 1, except that alumina (Al 2 O 3 ) and polyvinylidene fluoride as a binder are mixed in a weight ratio of about 20:80.

[0194] Example 4

[0195] The electrode assembly and the rechargeable lithium battery cell were manufactured in substantially the same manner as in Example 1, except that alumina (Al 2 O 3 ) and polyvinylidene fluoride as a binder are mixed in a weight ratio of about 10:90.

[0196] Comparative Example 1

[0197] The electrode assembly and the rechargeable lithium battery cell were manufactured in substantially the same manner as in Example 1, except that alumina (Al 2 O 3 ) and polyvinylidene fluoride as a binder are mixed in a weight ratio of about 70:30.

[0198] Comparative Example 2

[0199] The electrode assembly and the rechargeable lithium battery cell were manufactured in substantially the same manner as in Example 1, except that alumina (Al 2 O 3 ) and polyvinylidene fluoride as a binder are mixed in a weight ratio of about 50:50.

[0200] Evaluation Example

[0201] Evaluation Example 1: Peel Test

[0202] A peel test was performed by separating the ceramic insulating film from each of the positive electrode plates of Examples 1 to 4 and Comparative Examples 1 and 2 to test adhesion between the positive electrode uncoated portion and the ceramic insulating film.

[0203] Evaluation Example 2: Drop Test

[0204] A drop test was performed by freely dropping each of the rechargeable lithium battery cells of Examples 1 to 4 and Comparative Examples 1 and 2 from a height of about 1.8 m onto a steel plate on the ground.

[0205] As a drop test result, a voltage change according to heating or no heating is expressed as NG % due to an internal short circuit and damage at a connection between the positive and negative terminals outside the battery cell and a current collector part inside the battery cell.

[0206] Table 1

[0207] Peel test (gf / mm) Drop test (NG%) Comparative Example 1 1～2 5 Comparative Example 2 3 3 Example 1 Unmeasurable 0 Example 2 Unmeasurable 0 Example 3 Unmeasurable 0 Example 4 Unmeasurable 0

[0208] Referring to Table 1, Examples 1 to 4 exhibited such excellent or appropriate adhesion between the positive electrode plate and the separator that it was beyond the range of the test results (e.g., no measurable peeling test results). As such, in these Examples, even when (e.g., when) the rechargeable lithium battery cell was dropped, the brittle fracture of each positive electrode plate was suppressed.

[0209] Rechargeable lithium battery cells of some embodiments, which have a relatively high binder content (eg, amount) in a ceramic insulating film, suppress or reduce brittle fracture even when applied to electric vehicles.

[0210] In the present disclosure, "does not include one or any 'component'", "excludes one or any 'component'", "does not contain 'component'", etc. means that the "component" is not added, selected or used as a component in the composition or compound, but due to other impurities and / or external factors, less than an appropriate amount of the "component" may still be included.

[0211] The battery management system (BMS) device and / or any other related device or component according to the embodiments of the present disclosure described herein may be implemented using any appropriate hardware, firmware (e.g., a dedicated integrated circuit), software, or a combination of software, firmware, and hardware. For example, one or more appropriate components of the device may be formed on an integrated circuit (IC) chip or on a separate IC chip. In addition, one or more appropriate components of the device may be implemented on a flexible printed circuit film, a tape carrier package (TCP), or a printed circuit board (PCB), or formed on a substrate. In addition, one or more appropriate components of the device may be executed on one or more processors in one or more computing devices, execute computer program instructions, and interact with other system components to perform one or more appropriate functional processes or threads described herein. The computer program instructions are stored in a memory, which may be implemented in a computing device using a standard storage device (such as, for example, a random access memory (RAM)). The computer program instructions may also be stored in other non-temporary computer-readable media (such as, for example, a CD-ROM or a flash drive, etc.). Moreover, those skilled in the art should recognize that without departing from the scope of the present disclosure, the functions of one or more appropriate computing devices may be combined or integrated into a single computing device, or the functions of a dedicated computing device may be distributed on one or more other computing devices.

[0212] In the present disclosure, when a particle is spherical, “diameter” indicates a particle diameter or an average particle diameter, and when a particle is non-spherical, “diameter” indicates a major axis length or an average major axis length.

[0213] In the present disclosure, "does not include one or any 'component'", "excludes one or any 'component'", "does not contain 'component'", etc. means that the "component" is not added, selected or used as a component in the composition / structure, but due to other impurities and / or external factors, less than an appropriate amount of the "component" may still be included.

[0214] Although the present disclosure has been described in conjunction with what are presently considered to be practical example embodiments, it is to be understood that the present disclosure is not limited to the disclosed embodiments, but is intended in some embodiments to cover one or more suitable modifications and equivalent arrangements included within the spirit and scope of the claims and their equivalents.

Claims

1. A rechargeable lithium battery, include: An electrode assembly wound around a winding axis and comprising: a positive electrode plate having a positive electrode uncoated portion and a positive electrode coated portion; a negative electrode plate having a negative electrode uncoated portion and a negative electrode coated portion; and a separator between the positive electrode plate and the negative electrode plate, wherein the ceramic insulating film is on at least a portion of the uncoated portion of the positive electrode, The ceramic insulating film includes ceramic and a binder, and The binder content based on the total amount of the ceramic insulating film is greater than or equal to 60 wt %.

2. The rechargeable lithium battery of claim 1, wherein The binder content based on the total amount of the ceramic insulating film is greater than or equal to 80 wt %.

3. The rechargeable lithium battery of claim 1, wherein The ceramic is selected from Al 2 O 3 、SiO 2 、TiO 2 SnO 2 、CeO 2 , MgO, NiO, CaO, GaO, ZnO, ZrO 2 , Y 2 O 3 、SrTiO 3 、BaTiO 3 Mg(OH) 2 , boehmite, and at least one of a combination thereof.

4. The rechargeable lithium battery of claim 1, wherein The binder is at least one selected from polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylic resin, polyester resin, nylon and combinations thereof.

5. The rechargeable lithium battery of claim 1, wherein The positive electrode uncoated portion is at a long side end of the positive electrode plate from a winding front end to a winding end of the positive electrode plate.

6. The rechargeable lithium battery of claim 5, wherein The positive electrode uncoated portion is exposed at an upper portion of the separator.

7. The rechargeable lithium battery of claim 5, wherein The length and width of the uncoated portion of the positive electrode satisfy Equation 1: Equation 1 1.0×10 -3 ≤W 1 / L 1 ≤2.0×10 -3 in, In equation 1, L 1 is the length of the positive electrode plate, and W 1 is the width of the uncoated portion of the positive electrode.

8. The rechargeable lithium battery of claim 7, wherein The width of the positive electrode uncoated portion and the width of the positive electrode coated portion satisfy Equation 2: Equation 2 0.09≤W 1 / IN 2 ≤0.13 in, In equation 2, W 1 is the width of the uncoated portion of the positive electrode, and W 2 is the width of the positive electrode coating portion.

9. The rechargeable lithium battery of claim 5, wherein The positive electrode uncoated portion includes a first positive electrode uncoated portion used as a positive electrode tab and a second positive electrode uncoated portion not used as an electrode tab, and The ceramic insulating film is located on the second positive electrode uncoated portion.

10. The rechargeable lithium battery of claim 9, wherein The width of the first positive electrode uncoated portion and the width of the second positive electrode uncoated portion satisfy Equation 3: Equation 3 0.85≤W 11 / IN 12 ≤0.90 in, In equation 3, W 11 is the width of the uncoated portion of the first positive electrode; and W 12 is the width of the uncoated portion of the second positive electrode.

11. The rechargeable lithium battery of claim 1, further comprising include: A cylindrical can containing the electrode assembly.

12. The rechargeable lithium battery of claim 11, wherein The volume of the cylindrical tank is 145 cm 3 ~183cm 3 .

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