Insulating composition for rechargeable lithium batteries, electrode manufactured using the same, and rechargeable lithium battery

Abstract

Provided are an insulating composition for a rechargeable lithium battery, an electrode manufactured using the same, and a rechargeable lithium battery. The insulating composition for a rechargeable lithium battery includes a binder including a non-aqueous binder and an aqueous binder; inorganic particles; and a solvent. The non-aqueous binder includes a first non-aqueous polyvinylidene fluoride-based binder and a second non-aqueous polyimide-based binder.

Description

Technical Field

[0001] An insulating composition for a rechargeable lithium battery, an electrode manufactured based on the insulating composition, and a rechargeable lithium battery including the electrode are disclosed. Background Technology

[0002] Rechargeable lithium-ion batteries can be recharged, and their energy density per unit weight is typically three times or more than that of conventional lead-acid, nickel-cadmium, nickel-metal hydride, and nickel-zinc batteries. Rechargeable lithium-ion batteries can also be charged at high rates, making them suitable for commercial use in laptops, cell phones, power tools, electric bicycles, and more. Improving energy density can be advantageous.

[0003] Rechargeable lithium batteries are typically manufactured by injecting an electrolyte solution into an electrode assembly, which includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode active material capable of inserting / deintercalating lithium ions, and the negative electrode includes a negative electrode active material capable of inserting / deintercalating lithium ions.

[0004] Typically, the width of the negative electrode is wider than that of the positive electrode, and a diaphragm is placed between the positive and negative electrodes. Here, burrs formed at the edge of the positive electrode coating area may come into contact with the negative electrode, and a short circuit may occur between the positive and negative electrodes, or an OCV (open-circuit voltage) drop may occur.

[0005] To address the aforementioned problems, a method is generally known for coating the uncoated area of ​​the positive electrode with an insulating composition comprising inorganic particles. Polyvinylidene fluoride (PVdF) as a non-aqueous adhesive and styrene-butadiene rubber (SBR) as an aqueous adhesive are known as adhesives that allow the inorganic particles to adhere to the uncoated area of ​​the positive electrode while also allowing different inorganic particles to adhere.

[0006] However, the problem with PVdF binder is that it loses its adhesive strength after absorbing the electrolyte solution inside the rechargeable lithium battery and swelling after being coated on the uncoated area of ​​the positive electrode. The problem with SBR binder is that although it has good adhesive strength after coating, its viscosity drops sharply during the coating process. Summary of the Invention

[0007] Some example embodiments include insulating compositions for rechargeable lithium batteries that further improve coating processability and insulating layer performance while complementing the deficiencies of both non-aqueous and aqueous binders.

[0008] Some example embodiments include an insulating composition for a rechargeable lithium battery, the insulating composition comprising: an adhesive, including a non-aqueous adhesive and an aqueous adhesive; inorganic particles; and a solvent, wherein the non-aqueous adhesive comprises a first non-aqueous polyvinylidene fluoride-based adhesive and a second non-aqueous polyimide-based adhesive.

[0009] Some example embodiments include electrodes for rechargeable lithium batteries made using an insulating composition according to the foregoing example embodiments.

[0010] Some example embodiments include a rechargeable lithium battery, wherein at least one of the positive electrode and the negative electrode is or includes an electrode according to the foregoing embodiments.

[0011] The insulating composition for rechargeable lithium batteries according to the foregoing example embodiments can further improve coating processability and insulating layer performance while compensating for the deficiencies of both non-aqueous and aqueous binders.

[0012] Therefore, electrodes and rechargeable lithium batteries manufactured using the insulating composition for rechargeable lithium batteries according to the foregoing example embodiments can exhibit desired or improved cycle life characteristics. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating electrodes for a rechargeable lithium battery according to some example embodiments.

[0014] Figures 2 to 5 This is a schematic diagram illustrating a rechargeable lithium battery according to some example embodiments. Detailed Implementation

[0015] Hereinafter, exemplary embodiments of the present disclosure are described in detail. However, these embodiments are examples, and the present disclosure is not limited thereto, and is defined by the scope of the claims.

[0016] As used herein, unless otherwise specifically defined, it is understood that when an element such as a layer, film, region, or substrate is referred to as being “on” another element, the element may be “directly on” the other element, or there may be intervening elements between them.

[0017] As used herein, the singular may also include the plural unless otherwise specifically defined. Furthermore, unless otherwise stated, “A or B” may mean “including A, including B, or including both A and B”.

[0018] As used herein, “combination of” can mean a mixture, stack, complex, copolymer, alloy, blend or reaction product of the components.

[0019] As used herein, unless otherwise defined, particle size can be the average particle size. Furthermore, particle size can refer to the average particle size (D50), which represents the diameter of particles that constitute 50% of the total volume in a particle size distribution. The average particle size (D50) can be measured by methods known to those skilled in the art (e.g., by a particle size analyzer, or by transmission electron microscopy or scanning electron microscopy images). Optionally, data analysis can be performed using a dynamic light scattering measurement device, and the number of particles in each particle size range can be counted. Thus, the average particle size (D50) value can be readily obtained by calculation. Optionally, laser diffraction can be used to measure the average particle size. When measured by laser diffraction, for example, the particles to be measured are dispersed in a dispersion medium and then introduced into a commercially available laser diffraction particle size measurement device (e.g., Microtrac MT 3000), and irradiated with ultrasound at approximately 28 kHz at a 60 W output to calculate the average particle size (D50) based on 50% of the particle size distribution in the measurement device.

[0020] As used herein, the “average particle size” of the binder refers to the volume average particle size and is the Z-average particle size measured using a dynamic light scattering analysis apparatus.

[0021] When the terms “about” or “substantially” are used in conjunction with numerical values ​​in this specification, it means that the relevant numerical value includes a tolerance of ±10% around the stated value. When a range is specified, the range includes all values ​​in increments such as 0.1%.

[0022] Insulating composition for rechargeable lithium batteries: Some example embodiments include insulating compositions for rechargeable lithium batteries, the insulating composition comprising: an adhesive, including non-aqueous and aqueous adhesives; inorganic particles; and a solvent. The non-aqueous adhesives include a first non-aqueous polyvinylidene fluoride-based adhesive and a second non-aqueous polyimide-based adhesive.

[0023] The insulating compositions for rechargeable lithium batteries according to some example embodiments can further improve coating processability and insulating layer performance while compensating for the deficiencies of both non-aqueous and aqueous binders.

[0024] The insulating composition for a rechargeable lithium battery according to the foregoing example embodiments is described in detail below.

[0025] Non-aqueous adhesives (first non-aqueous adhesive and second non-aqueous adhesive) A commonly used non-aqueous binder in insulating compositions in this field is polyvinylidene fluoride (PVDF). As mentioned above, a potential challenge is that, after being applied to uncoated areas of the positive or negative electrode, the adhesive strength may be lost due to absorption of the electrolyte solution and swelling within the rechargeable lithium battery.

[0026] Conversely, the insulating composition for a rechargeable lithium battery according to the above example embodiments includes a non-aqueous adhesive comprising a first non-aqueous polyvinylidene fluoride-based adhesive and a second non-aqueous polyimide-based adhesive.

[0027] By combining a second non-aqueous polyimide binder with a first non-aqueous polyvinylidene fluoride binder as a non-aqueous binder, the rapid decrease in slurry viscosity can be prevented or suppressed, thereby improving coating processability. At the same time, compared with the use of the first non-aqueous polyvinylidene fluoride binder alone, the physical properties of the final electrode are improved, such as improved adhesion strength, reduced swelling rate, and reduced or suppressed curling shape.

[0028] The second type of non-aqueous polyimide adhesive may not include carboxyl groups ( -COOH). This is because when a carboxyl group is included ( When -COOH is present, the thixotropic index (TI) of the insulating composition slurry is high, therefore the rheological properties of the slurry may be poor. The thixotropic index (TI) value is determined by a shear rate of 1 s⁻¹ at 25°C. -1 The viscosity at that time divided by the shear rate is 10 s. -1 The viscosity at that time was calculated, and then the logarithm was taken to obtain the value. Carboxyl group ( The presence or absence of -COOH can be confirmed by Fourier transform infrared (FT-IR) spectroscopy.

[0029] The weight ratio of the first non-aqueous polyvinylidene fluoride adhesive to the second non-aqueous polyimide adhesive can be in the range of about 10:90 to about 90:10, about 20:80 to about 80:20, or about 30:70 to about 70:30.

[0030] Within the aforementioned range, a synergistic effect can be achieved by using a combination of a first non-aqueous polyvinylidene fluoride adhesive and a second non-aqueous polyimide adhesive.

[0031] water-based adhesives The waterborne adhesive may be or include at least one of styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0032] For example, the waterborne adhesive may be or include styrene-butadiene rubber and styrene-butadiene rubber optionally replaced by an organic solvent (e.g., N-methyl-2-pyrrolidone (NMP)).

[0033] By mixing aqueous binders with non-aqueous binders, the physical properties of the final manufactured electrodes can be improved compared to using non-aqueous binders alone. These properties include improved bond strength, reduced swelling rate, and reduced or suppressed curling.

[0034] The weight ratio of non-aqueous adhesive to water-based adhesive can be in the range of about 90:10 to about 60:40 or about 80:20 to about 70:30, and synergistic effects can be achieved by mixing non-aqueous adhesive and water-based adhesive.

[0035] Adhesive Mixing Based on a total amount of 100 wt%, the adhesive may include a first non-aqueous polyvinylidene fluoride adhesive in an amount ranging from about 10 wt% to about 70 wt%, about 20 wt% to about 60 wt%, or about 30 wt% to about 50 wt%; a second non-aqueous polyimide adhesive may be included in an amount ranging from about 10 wt% to about 70 wt%, about 20 wt% to about 60 wt%, or about 30 wt% to about 50 wt%; and an aqueous adhesive may be included in an amount ranging from about 10 wt% to about 40 wt%, about 15 wt% to about 40 wt%, or about 20 wt% to about 40 wt%.

[0036] Within the aforementioned range, a synergistic effect can be achieved by using a combination of a first non-aqueous polyvinylidene fluoride adhesive, a second non-aqueous polyimide adhesive, and an aqueous adhesive.

[0037] Inorganic particles Inorganic particles may be, but are not limited to, at least one of Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof.

[0038] The average particle size (D50) of inorganic particles can be in the range of about 1 μm to about 2.5 μm, but is not limited thereto.

[0039] solvent The solvent may be, but is not limited to, at least one of NMP, N-ethylpyrrolidone (NEP), dimethylacetamide (DMAc), dimethylformamide (DMF), and combinations thereof.

[0040] Component mixing The composition for the insulating layer, based on a total amount of 100 wt%, may include an adhesive in an amount ranging from about 60 wt% to about 90 wt%, for example, from about 70 wt% to about 90 wt%; may include inorganic particles in an amount ranging from about 10 wt% to about 40 wt%, for example, from about 10 wt% to about 30 wt%; and may include a solvent in the balance.

[0041] The weight ratio of binder to inorganic particles can be in the range of about 90:10 to about 60:40 or about 80:20 to about 70:30.

[0042] When the above range is met, the adhesive strength of the adhesive and the insulating properties of the inorganic particles can be coordinated, and the adhesive and inorganic particles can be dispersed in the solvent.

[0043] Composition characteristics The compositions used in insulating layers exhibit the following desired or improved physical properties.

[0044] At a temperature of approximately 25°C, in approximately 10 seconds -1 At a certain shear rate, the insulating composition can have a viscosity in the range of about 500 mPa·s to about 2500 mPa·s, for example, about 1000 mPa·s to about 2000 mPa·s.

[0045] The insulating composition may have a thixotropic index (TI) value of less than or equal to about 0.5, for example less than or equal to about 0.2 or in the range of about 0.1 to about 0.5, wherein the thixotropic index value is determined by measuring the thixotropic index at 25°C for 1 second. -1 Viscosity at shear rate divided by viscosity at 10 s -1 The viscosity at the shear rate is then taken as a logarithm to obtain the value.

[0046] electrode: An electrode according to some example embodiments includes: an electrode active material layer; an electrode current collector including a coated region having the electrode active material layer and an uncoated region not having the electrode active material layer; and an insulating layer configured to coat at least a portion of the uncoated region.

[0047] The insulating layer comprises inorganic particles and an adhesive containing both non-aqueous and aqueous adhesives. The non-aqueous adhesives include a first non-aqueous polyvinylidene fluoride (PVDF) adhesive and a second non-aqueous polyimide adhesive.

[0048] When at least a portion of an uncoated area is coated with an insulating composition for a rechargeable lithium battery according to the foregoing example embodiments, the solvent is removed, and an insulating layer comprising an adhesive and inorganic particles can be formed.

[0049] Therefore, the same description can be applied to the electrodes for rechargeable lithium batteries according to the above example embodiments, except for the term "solvent" in the above embodiments.

[0050] The electrodes for rechargeable lithium batteries according to the foregoing example embodiments are described in detail below, except for any descriptions that are repeated from the previous description.

[0051] Structure of the insulating layer Figure 1 This is a schematic diagram illustrating an electrode for a rechargeable lithium battery according to the foregoing example embodiment.

[0052] like Figure 1 As shown, the insulating layer may cover (e.g., simultaneously or together) a portion of the burrs and uncoated areas formed at the edges of the electrode active material layer.

[0053] By forming an insulating layer with this structure, it is possible to effectively reduce or prevent burrs formed at the edges of the electrode coating area from contacting other electrodes. The electrode can be a positive electrode or a negative electrode. For example, a rechargeable lithium battery can be manufactured that includes a positive electrode coated with an insulating layer and a negative electrode coated with an insulating layer.

[0054] Insulation layer thickness The thickness of the insulating layer can be greater than the thickness of the burrs formed at the edge of the electrode coating area.

[0055] For example, the thickness of the insulating layer can be in the range of about 5 μm to about 50 μm, such as about 8 μm to about 40 μm. Within this range, burrs formed at the edges of the electrode coating area can be effectively prevented from contacting the opposite electrode.

[0056] Physical properties of electrodes including insulating layers The desired or improved physical properties exhibited by the insulation layer are as follows.

[0057] The crosslinking density can be greater than or equal to about 10%, for example, greater than or equal to about 20 wt%, which is expressed as the weight ratio of the crosslinked polymer based on 100 wt% of the total amount of the insulating layer.

[0058] Based on 100% of the total area of ​​the insulating layer, after immersing the electrode in the electrolyte solution for approximately 24 hours at room temperature, the area of ​​the insulating layer detached can be less than or equal to approximately 10% of the total area, for example, approximately 0%.

[0059] Based on 100% of the total length of the insulation layer, after immersing the electrode in the electrolyte solution for approximately 24 hours at room temperature, the change in the length of the insulation layer can be less than or equal to approximately 5% of the length, for example, approximately 0%.

[0060] The aforementioned electrolyte solution may be or include a mixture of about 1.5 M lithium salt (LiPF6) in a carbonate solvent, wherein ethylene carbonate (EC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC) are mixed in a volume ratio of about 20:40:40.

[0061] Rechargeable lithium batteries: A rechargeable lithium battery according to some example embodiments includes a positive electrode, a negative electrode, a separator between the positive and negative electrodes, and an electrolyte solution, wherein at least one of the positive and negative electrodes is or includes an electrode according to the foregoing example embodiments.

[0062] Therefore, electrodes and rechargeable lithium batteries manufactured using the insulating composition for rechargeable lithium batteries according to the foregoing example embodiments can exhibit desired or improved cycle life characteristics.

[0063] The following describes in detail some example embodiments of rechargeable lithium batteries, except where otherwise described.

[0064] Positive electrode active material The positive electrode active material may be or includes compounds capable of intercalating and deintercalating lithium (lithium-intercalating compounds). For example, it may include one or more types of composite oxides of lithium and metals such as or including at least one of cobalt, manganese, nickel, and combinations thereof.

[0065] The composite oxide can be or includes lithium transition metal composite oxides, and examples of lithium transition metal composite oxides can include at least one of lithium nickel oxides, lithium cobalt oxides, lithium manganese oxides, lithium iron phosphate compounds, cobalt-free lithium nickel manganese oxides, and combinations thereof.

[0066] As an example, it may include compounds represented by any of the following chemical formulas. 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 The 4-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 The 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 Mn b X c The 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 O2(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 O2(0.90≤a≤1.8,0.001≤b≤0.1);Li a CoG b O2(0.90≤a≤1.8,0.001≤b≤0.1);Li a Mn 1-b G b O2(0.90≤a≤1.8,0.001≤b≤0.1);Li a Mn2G b O4(0.90≤a≤1.8,0.001≤b≤0.1);Li a Mn 1-g G g PO4(0.90≤a≤1.8,0≤g≤0.5);Li (3-f) Fe2(PO4)3(0≤f≤2); and Li a FePO4 (0.90≤a≤1.8).

[0067] In the above chemical formulas, A is or includes at least one of Ni, Co, Mn, and combinations thereof; X is or includes at least one of Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, and combinations thereof; D is or includes at least one of O, F, S, P, and combinations thereof; G is or includes at least one of Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, and combinations thereof; and L 1 It is or includes at least one of Mn, Al and combinations thereof.

[0068] The positive electrode active material may be or include at least one of the following: lithium nickel oxide represented by chemical formula 11, lithium cobalt oxide represented by chemical formula 12, lithium iron phosphate compound represented by chemical formula 13, cobalt-free lithium nickel manganese oxide represented by chemical formula 14, and combinations thereof.

[0069] Chemical Formula 11: Li a1 Ni x1 M 1 y1 M 2 z1 O 2-b1 X b1 .

[0070] In chemical formula 11, 0.9 ≤ a1 ≤ 1.8, 0.3 ≤ x1 ≤ 1, 0 ≤ y1 ≤ 0.7, 0 ≤ z1 ≤ 0.7, 0.9 ≤ x1 + y1 + z1 ≤ 1.1 and 0 ≤ b1 ≤ 0.1, M 1 and M 2 Each of them independently is or includes one or more of Al, B, Ba, Ca, Ce, Co, Cr, Cu, Fe, Mg, Mn, Mo, Nb, Si, Sn, Sr, Ti, V, W and Zr, and X is or includes one or more of F, P and S.

[0071] In chemical formula 11, 0.6≤x1≤1, 0≤y1≤0.4 and 0≤z1≤0.4; or 0.8≤x1≤1, 0≤y1≤0.2 and 0≤z1≤0.2.

[0072] Chemical formula 12: Li a2 Co x2 M 3 y2 O 2-b2 X b2 .

[0073] In chemical formula 12, 0.9 ≤ a² ≤ 1.8, 0.7 ≤ x² ≤ 1, 0 ≤ y² ≤ 0.3, 0.9 ≤ x² + y² ≤ 1.1 and 0 ≤ b² ≤ 0.1, M 3is or includes one or more of Al, B, Ba, Ca, Ce, Cr, Cu, Fe, Mg, Mn, Mo, Ni, Se, Si, Sn, Sr, Ti, V, W, Y, Zn, and Zr, and X is or includes one or more of F, P, and S.

[0074] Chemical formula 13: Li a3 Fe x3 M 4 y3 PO 4-b3 X b3 .

[0075] In Chemical formula 13, 0.9 ≤ a3 ≤ 1.8, 0.6 ≤ x3 ≤ 1, 0 ≤ y3 ≤ 0.4, and 0 ≤ b3 ≤ 0.1, M 4 is or includes one or more of Al, B, Ba, Ca, Ce, Co, Cr, Cu, Mg, Mn, Mo, Ni, Se, Si, Sn, Sr, Ti, V, W, Y, Zn, and Zr, and X is or includes one or more of F, P, and S.

[0076] Chemical formula 14: Li a4 Ni x4 Mn y4 M 5 z4 O 2-b4 X b4 .

[0077] In Chemical formula 14, 0.9 ≤ a4 ≤ 1.8, 0.8 ≤ x4 < 1, 0 < y4 ≤ 0.2, 0 ≤ z4 ≤ 0.2, 0.9 ≤ x4 + y4 + z4 ≤ 1.1, and 0 ≤ b4 ≤ 0.1, M 5 is an element that is or includes at least one of Al, B, Ba, Ca, Ce, Cr, Fe, Mg, Mo, Nb, Si, Sn, Sr, Ti, V, W, and Zr, and X is or includes one or more of F, P, and S.

[0078] For example, the positive electrode active material can be or include a high-nickel positive electrode active material. Based on 100 mol% of the metals other than lithium in the lithium transition metal composite oxide, the nickel content of the high-nickel positive electrode active material is greater than or equal to about 80 mol%, greater than or equal to about 85 mol%, greater than or equal to about 90 mol%, greater than or equal to about 91%, or greater than or equal to about 94 mol% and less than or equal to about 99 mol%. The high-nickel positive electrode active material can achieve high capacity and can be applied to high-capacity and high-density rechargeable lithium batteries.

[0079] positive electrode The positive electrode for a rechargeable lithium battery may include a current collector and a layer of positive electrode active material on the current collector. The positive electrode may be manufactured using an insulating composition for a rechargeable lithium battery according to the foregoing example embodiments.

[0080] The positive electrode active material layer may include a positive electrode active material, and may further include a binder and / or a conductive material.

[0081] For example, the positive electrode may also include additives that can be used as a sacrificial positive electrode.

[0082] Based on a 100wt% positive electrode active material layer, the amount of positive electrode active material can be in the range of about 90wt% to about 99.5wt%, and based on a 100wt% positive electrode active material layer, the amounts of binder and conductive material can both be in the range of about 0.5wt% to about 5wt%.

[0083] The binder is configured to improve the adhesion properties between the positive electrode active material particles and the adhesion properties between the positive electrode active material particles and the current collector. Examples of binders may include at least one of the following: polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymers, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylate resin, polyester resin, and nylon, but are not limited thereto.

[0084] The conductive material is included to provide electrode conductivity, and as a conductive material, it can include any electrically conductive material unless it causes an adverse chemical change in the battery. Examples of conductive materials can include: carbon-based materials, such as at least one of natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc.; metallic materials such as metal powders or metal fibers, including at least one of copper, nickel, aluminum, silver, etc.; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0085] Negative electrode active material The negative electrode active material may include at least one of the following: materials capable of reversibly inserting / deintercalating lithium ions, lithium metal, lithium metal alloys, materials capable of doping / dedoping lithium, and transition metal oxides.

[0086] Materials that can reversibly embed / desorb lithium ions can include, for example, crystalline carbon, amorphous carbon, or a combination thereof as carbonaceous negative electrode active materials. The crystalline carbon can be irregular natural graphite or artificial graphite, or can be natural graphite or artificial graphite in the form of flakes, lamellae, spheres, or fibers. The amorphous carbon can be or include at least one of soft carbon, hard carbon, mesophase pitch carbonization products, calcined coke, etc.

[0087] The lithium metal alloy includes an alloy of lithium and a metal such as or including at least one of Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn.

[0088] Materials capable of doping / undoping lithium can be or include at least one of Si-based negative electrode active materials and Sn-based negative electrode active materials. The Si-based negative electrode active materials can include silicon, silicon-carbon composites, SiO x (0 < x ≤ 2), Si-Q alloys (where Q is or includes at least one of 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 combinations thereof), and combinations thereof. The Sn-based negative electrode active materials can be or include at least one of Sn, SnO2, Sn-based alloys, and combinations thereof.

[0089] The silicon-carbon composite can be or include a composite of silicon and amorphous carbon. According to some example embodiments, the silicon-carbon composite can be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles. For example, the silicon-carbon composite can include secondary particles (cores) in which primary silicon particles are assembled and an amorphous carbon coating layer (shell) on the surface of the secondary particles. Amorphous carbon can also be present between the primary silicon particles. For example, the primary silicon particles can be coated with amorphous carbon. The secondary particles can be dispersed in an amorphous carbon matrix.

[0090] The silicon-carbon composite can also include crystalline carbon. For example, the silicon-carbon composite can include a core containing crystalline carbon and silicon particles and an amorphous carbon coating layer on the surface of the core.

[0091] The Si-based negative electrode active material or the Sn-based negative electrode active material can be mixed with the carbonaceous negative electrode active material.

[0092] negative electrode The negative electrode for a rechargeable lithium battery includes a current collector and a negative electrode active material layer on the current collector. The negative electrode active material layer includes a negative electrode active material and can also include a binder and / or a conductive material. The negative electrode can be or include a negative electrode manufactured using the insulating composition for a rechargeable lithium battery according to the above example embodiments.

[0093] For example, the negative electrode active material layer may include about 90 wt% to about 99 wt% of negative electrode active material, about 0.5 wt% to about 5 wt% of binder and about 0.5 wt% to about 5 wt% of conductive material.

[0094] The binder is configured to adhere the negative electrode active material particles to each other and to attach the negative electrode active material to the current collector. The binder may be or include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0095] Non-aqueous adhesives may include at least one of polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide, and combinations thereof.

[0096] The waterborne adhesive may be or include at least one of styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0097] When an aqueous binder is included as the negative electrode binder, a cellulose-based compound capable of imparting viscosity may be further included. As a cellulose-based compound, one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts may be mixed. The alkali metal may be or include at least one of Na, K, and Li.

[0098] Dry adhesives are or include fibrous polymeric materials and may be or include at least one of, for example, polytetrafluoroethylene, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, and combinations thereof.

[0099] The conductive material is included to provide electrode conductivity, and can include any electrically conductive material unless it causes an adverse chemical change in the battery. Examples of conductive materials include: carbon-based materials, such as at least one of natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc.; metallic materials such as metal powders or metal fibers, including at least one of copper, nickel, aluminum, silver, etc.; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0100] The negative electrode current collector may include at least one of copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, polymer substrate coated with conductive metal, and combinations thereof.

[0101] Electrolyte solution Electrolyte solutions used in rechargeable lithium batteries include non-aqueous organic solvents and lithium salts.

[0102] Non-aqueous organic solvents constitute the medium for transporting ions that participate in the electrochemical reactions of the battery.

[0103] Non-aqueous organic solvents may be or include at least one of carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, aprotic solvents, and combinations thereof.

[0104] Carbonate solvents may include at least one of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC), ethylene carbonate (EC), propylene carbonate (PC), and butyl carbonate (BC). Esters may include at least one of methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, decanolactone, mevalonolactone, valproic acid lactone, and caprolactone. Ether solvents may include at least one of dibutyl ether, tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ether, dimethoxyethane, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, and tetrahydrofuran. Additionally, ketone solvents may include cyclohexanone. Alcohol solvents may include at least one of ethanol and isopropanol. Aprotic solvents may include at least one of the following: nitriles, such as R-CN (wherein R is a C2 to C20 straight-chain, branched or cyclic hydrocarbon group, and includes double bonds, aromatic rings or ether groups, etc.); amides, such as dimethylformamide; dioxolane, such as 1,3-dioxolane, 1,4-dioxolane, etc.; sulfolane; etc.

[0105] Non-aqueous organic solvents may be included alone or as a mixture of two or more types of solvents.

[0106] Furthermore, when using carbonate solvents, cyclic carbonates and chain carbonates can be mixed, and the cyclic carbonates and chain carbonates can be mixed in a volume ratio ranging from about 1:1 to about 1:9.

[0107] The electrolyte solution may also include at least one of ethylene ethyl carbonate, vinylene carbonate, fluoroethylene ethyl carbonate, difluoroethylene ethyl carbonate, chloroethylene carbonate, dichloroethylene carbonate, bromoethylene carbonate, dibromoethylene carbonate, nitroethylene carbonate, cyanoethylene carbonate, and combinations thereof as additives.

[0108] Lithium salts dissolved in organic solvents are configured to supply lithium ions in batteries, enabling basic operation of rechargeable lithium batteries and improving lithium ion transport between the positive and negative electrodes. Examples of lithium salts may include LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, LiAlO2, LiAlCl4, LiPO2F2, LiCl, LiI, LiN(SO3C2F5)2, Li(FSO2)2N (lithium bis(fluorosulfonyl)imide, LiFSI), LiC4F9SO3, LiN(C x F 2x+1 SO2)(C y F 2y+1 At least one of the following: (SO2) (where x and y are integers from 1 to 20), lithium trifluoromethane sulfonate, lithium tetrafluoroethane sulfonate, lithium difluoro(oxalate)borate (LiDFOB), lithium difluorobis(oxalate)phosphate (LiDFBOP), and lithium bis(oxalate)borate (LiBOB).

[0109] diaphragm Depending on the type of rechargeable lithium battery, a separator may be present between the positive and negative electrodes. The separator may include at least one of polyethylene, polypropylene, polyvinylidene fluoride, and multilayer films of two or more layers, and may include mixed multilayer films, such as polyethylene / polypropylene bilayer separators, polyethylene / polypropylene / polypropylene trilayer separators, polypropylene / polypropylene / polypropylene trilayer separators, etc.

[0110] The membrane may include a porous substrate and a coating layer on one or both surfaces of the porous substrate, comprising organic materials, inorganic materials or combinations thereof.

[0111] The porous substrate may be or include a polymer membrane formed of or containing any one polymer or a copolymer or mixture of two or more of the polymers, such polymers as or including at least one of polyolefins (such as polyethylene and polypropylene), polyesters (such as polyethylene terephthalate and polybutylene terephthalate), polyacetal, polyamide, polyimide, polycarbonate, polyetherketone, polyaryletherketone, polyetherketone, polyetherimide, polyamideimide, polybenzimidazole, polyethersulfone, polyphenylene ether, cyclic olefin copolymers, polyphenylene sulfide, polyethylene naphthalate, glass fiber, and polytetrafluoroethylene (e.g., Teflon).

[0112] Organic materials may include polymers such as polyvinylidene fluoride or (meth)acrylic acid polymers.

[0113] Inorganic materials may include inorganic particles, such as or including at least one of Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof, but are not limited thereto.

[0114] Organic and inorganic materials can be mixed in a coating layer, or a coating layer containing organic materials and a coating layer containing inorganic materials can be stacked together.

[0115] Rechargeable lithium batteries Based on their shape, rechargeable lithium batteries can be classified into cylindrical batteries, prismatic batteries, pouch batteries, or coin-shaped batteries, etc. Figures 2 to 5 This is a schematic diagram illustrating a rechargeable lithium battery according to some example embodiments, wherein, Figure 2 It is a cylindrical battery. Figure 3 It is a prismatic battery. Figure 4 and Figure 5 It's a pouch battery. (See reference) Figures 2 to 5 The rechargeable lithium battery 100 includes an electrode assembly 40 and a housing 50. The electrode assembly 40 has a separator 30 disposed between a positive electrode 10 and a negative electrode 20. The electrode assembly 40 is housed within the housing 50. The positive electrode 10, the negative electrode 20, and the separator 30 can be impregnated with an electrolyte solution (not shown). Figure 2 As shown, the rechargeable lithium battery 100 may include a sealing member 60 of the sealed housing 50. Additionally, in Figure 3 In this context, the rechargeable lithium battery 100 may include a positive electrode lead connector 11, a positive electrode terminal 12 connected to the positive electrode lead connector 11, a negative electrode lead connector 21, and a negative electrode terminal 22 connected to the negative electrode lead connector 21. For example... Figure 4 and Figure 5 As shown, the rechargeable lithium battery 100 includes Figure 5 The electrode connector 70 shown in the figure, or Figure 4 The positive electrode terminal 71 and negative electrode terminal 72 shown in the figure form an electrical path for inducing current formed in the electrode assembly 40 to the outside of the rechargeable lithium battery 100.

[0116] The rechargeable lithium batteries according to some example embodiments can be used in automobiles, mobile phones and / or various types of electrical devices, but this disclosure is not limited thereto.

[0117] Examples and comparative examples of this disclosure are described below. However, the following examples are merely examples of this disclosure, and this disclosure is not limited to these examples.

[0118] Example 1 (1) Preparation of insulating composition Polyvinylidene fluoride (Mw: 700 g / mol to 900 g / mol) as the first non-aqueous binder, polyimide (Mw: 260,000 g / mol to 280,000 g / mol) as the second non-aqueous binder, and styrene-butadiene rubber (Mw: 1,400,000 g / mol to 1,600,000 g / mol) as the aqueous binder are mixed in a weight ratio of 1:1:1.

[0119] An insulating composition is prepared by mixing 80 wt% to 90 wt% of a mixed binder, 10 wt% to 20 wt% of boehmite as inorganic particles with an average particle size (D50) of 2 μm, and the solvent NMP.

[0120] Here, the weight ratio of total binder to inorganic particles is in the range of 80:20 to 90:10.

[0121] (2) Manufacturing of the positive electrode An aluminum foil with a width × width × thickness of 75mm × 68mm × 0.012mm was used as the positive electrode current collector.

[0122] By using LiNi as the positive electrode active material 0.91 Co 0.05 Al 0.04 O2, polyvinylidene fluoride (PVdF) as a binder, and carbon as a conductive material are mixed in a weight ratio of 92:4:4, and the mixture is dispersed in N-methyl-2-pyrrolidone to prepare a positive electrode active material slurry. This slurry is coated onto an aluminum foil, resulting in a width × width × thickness of 65.8 mm × 60 mm × 0.078 mm, thereby forming a positive electrode active material layer.

[0123] The portion of the positive electrode current collector with a layer of positive electrode active material is called the "positive electrode coated area," and the other portions of the positive electrode current collector without a layer of positive electrode active material are called the "positive electrode uncoated area."

[0124] The insulating composition is coated onto the "uncoated area of ​​the positive electrode" with a width ranging from 5 mm to 20 mm and a thickness ranging from 10 μm to 20 μm, and is coated simultaneously with or after the positive electrode active material layer and then dried. The insulating layer may or may not be overlapped with the positive electrode coated area.

[0125] (3) Manufacturing of the negative electrode A negative electrode active material slurry was prepared by mixing artificial graphite and silicon particles in a weight ratio of 93.5:6.5 as the negative electrode active material, and by mixing the negative electrode active material, styrene-butadiene rubber binder, and carboxymethyl cellulose in a weight ratio of 97:1:2 and dispersing the mixture in distilled water.

[0126] The negative electrode active material slurry was coated onto a 10 μm thick Cu foil, dried at 100 °C and pressed to form a negative electrode active material layer.

[0127] The insulating composition is coated on the "uncoated area of ​​the negative electrode" with a width in the range of 5 mm to 20 mm and a thickness in the range of 10 μm to 20 μm, and is coated simultaneously or after the negative electrode active material layer and dried.

[0128] (4) Preparation of electrolyte solution An electrolyte solution was prepared by mixing 1.5 M lithium salt (LiPF6) with a carbonate solvent comprising ethylene carbonate (EC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC) in a volume ratio of 20:40:40.

[0129] (5) Manufacturing of rechargeable lithium battery cells The manufactured positive and negative electrodes are assembled to obtain an electrode assembly, which is then inserted into a prismatic housing, and an electrolyte solution is injected into it to manufacture a rechargeable lithium battery cell.

[0130] Examples 2 to 5 The insulating compositions, positive electrodes, and rechargeable lithium battery cells of Examples 2 to 5 were manufactured in the same manner as in Example 1, except that when preparing the insulating compositions, the weight ratio of polyvinylidene fluoride:polyimide:styrene-butadiene rubber was changed according to Table 1 below.

[0131] Comparison Examples 1 to 9 The insulating compositions, positive electrodes, and rechargeable lithium battery cells of Comparative Examples 1 to 9 were manufactured in the same manner as in Example 1, except that the weight ratio of polyvinylidene fluoride:polyimide:styrene-butadiene rubber was changed according to Table 2 below when preparing the insulating compositions.

[0132] Evaluation Example 1: Evaluation of Insulating Compositions The insulating compositions of Examples 1 to 5 and Comparative Examples 1 to 9 were evaluated using the following methods, and the results are shown in Tables 1 and 2 below.

[0133] (1) Particle size: 0.08 g of the insulating composition was dispersed in 5 mL of NMP dispersion solvent using a particle size analyzer (Malvern Mastersizer 3000) and measured between 1500 rpm and 1700 rpm. The particle size was then evaluated according to the following criteria.

[0134] ◎: Cases where the D50 value is in the range of 1.5μm to 3μm and the center value of the normally distributed curve has a volume density of 8% or greater. ○: The case where the D50 value deviates from the range of 1.5μm to 3μm by less than 0.5μm and the volume density of the center value of the normally distributed curve is less than 8%. X: The D50 value deviates from the normal distribution by less than 0.5 μm relative to the range of 1.5 μm to 3 μm and has two or more central values. (2) Viscosity: By attaching the cone plate PP25 to the viscosity measuring device (Anton Paar, MCR302E) at 25°C for 10s -1 The shear rate was measured and evaluated according to the following criteria.

[0135] ◎: In 10s -1 At shear rates, the viscosity is in the range of 1000 mPa·s to 2000 mPa·s. ○: In 10s -1 At shear rates, the viscosity deviates by less than or equal to 500 mPa·s relative to the range of 1000 mPa·s to 2000 mPa·s. △: in 10s -1 At shear rates, the viscosity deviates by more than 500 mPa·s relative to the range of 1000 mPa·s to 2000 mPa·s. X: Viscosity cannot be measured (3) TI: by 1s at 25°C -1 Viscosity at shear rate divided by viscosity at 10 s -1 The viscosity at the shear rate is calculated, and its logarithm is used to evaluate the thixotropic index (TI) according to the following criteria.

[0136] ◎: TI is less than 0.2 ○: TI is 0.2 to 0.5 △: TI > 0.5 X: Viscosity cannot be measured Evaluation Example 2: Evaluation of the Positive Electrode For each positive electrode of Examples 1 to 5 and Comparative Examples 1 to 9, the following methods were used for evaluation, and the results are shown in Tables 1 and 2 below.

[0137] (1) Adhesion strength (peeling): Each insulating composition was coated onto an aluminum substrate to a thickness of 10 μm, dried in an oven at 130°C, and immersed in an electrolyte solution. After 24 hours at room temperature, the insulation layer was determined to have detached from the aluminum substrate. The results were evaluated according to the following criteria. Here, the electrolyte solution used is the same as that used in Example 1.

[0138] ◎: Detached from 0 area % ○: The probability of detachment is greater than 0% and less than or equal to 10% of the area. △: The probability of detachment is greater than 10% and less than or equal to 20% of the area. X: The probability of detachment is greater than 20% of the area. (2) Swelling rate: Each insulating composition was coated onto an aluminum substrate to a thickness of 10 μm, dried in an oven at 130°C, and immersed in an electrolyte solution. After 24 hours at room temperature, the length change of each insulating layer was measured. The results were evaluated according to the following criteria. Here, the electrolyte solution used is the same as that used in Example 1.

[0139] ◎: Swelling rate is 0% (length%) ○: The swelling rate is greater than 0% and less than or equal to 5% of the length. △: The swelling rate is greater than 5% of length and less than or equal to 10% of length. X: Swelling rate is greater than 10% of length. (3) Curling: Samples were prepared by coating an insulating composition to an aluminum substrate with a thickness of 20 μm, drying it in an oven at 130 °C, and then stamping it to 36 φ. A 2 cm × 2 cm incision was cut in the center of the sample, and the center was measured using a ruler. The results were evaluated according to the following criteria.

[0140] ◎: The curl height is less than or equal to 1mm ○: The curl height is greater than 1mm and less than or equal to 2mm △: The curl height is greater than 2mm and less than or equal to 3mm X: Curl height is greater than 3mm Evaluation Example 3: Evaluation of Rechargeable Lithium-ion Battery Cells For each rechargeable lithium battery cell of Examples 1 to 5 and Comparative Examples 1 to 9, the following methods were used for evaluation, and the results are shown in Tables 1 and 2.

[0141] Cycle life characteristics were evaluated by calculating the ratio of the discharge capacity of the 500th cycle to the discharge capacity of the 1st cycle after 500 charge and discharge cycles of a button cell battery at 0.5C within a voltage range of 3.0V to 4.25V at 25°C.

[0142] ◎: Cycle life characteristic is greater than or equal to 90%. ○: Cycle life characteristic is greater than or equal to 80% and less than 90%. △: Cycle life characteristic is greater than or equal to 60% and less than 80%. X: Cycle life characteristic is less than 60%. Table 1: (Unit: parts by weight)

[0143] Table 2: (Unit: parts by weight)

[0144] The insulating compositions for rechargeable lithium batteries presented in Examples 1 to 5 combine non-aqueous and aqueous binders, and use a first non-aqueous polyvinylidene fluoride binder and a second non-aqueous polyimide binder as non-aqueous binders, thereby overcoming the deficiencies of both non-aqueous and aqueous binders while exhibiting further improved coating processability and insulating layer properties.

[0145] Therefore, electrodes and rechargeable lithium batteries manufactured using the insulating composition for rechargeable lithium batteries according to the foregoing embodiments can exhibit desired or improved cycle life characteristics.

[0146] While this disclosure has been described in conjunction with what are now considered to be exemplary embodiments, it will be understood that the disclosure is not limited to the disclosed exemplary embodiments. Rather, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

[0147] Description of the tag: 100: Rechargeable lithium battery 10: Positive electrode 11: Positive electrode lead connector 12: Positive electrode terminal 20: Negative electrode 21: Negative electrode lead connector 22: Negative electrode terminal 30: Diaphragm 40: Electrode assembly 50: Casing 60: Sealing component 70: Electrode connector 71: Positive electrode connector 72: Negative electrode connector.

Claims

1. An insulating composition for a rechargeable lithium battery, said insulating composition comprising: Adhesives, including non-aqueous adhesives and aqueous adhesives; Inorganic particles; as well as Solvent, The non-aqueous adhesive includes a first non-aqueous polyvinylidene fluoride adhesive and a second non-aqueous polyimide adhesive.

2. The insulating composition according to claim 1, wherein: The weight ratio of the first non-aqueous polyvinylidene fluoride adhesive to the second non-aqueous polyimide adhesive is in the range of 10:90 to 90:

10.

3. The insulating composition according to claim 1, wherein: The waterborne adhesive includes at least one of styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, and polyvinyl alcohol, and at least one combination thereof.

4. The insulating composition of claim 1, wherein: The weight ratio of the non-aqueous adhesive to the aqueous adhesive is in the range of 90:10 to 60:

40.

5. The insulating composition according to claim 1, wherein, Based on a total amount of 100 wt% of the binder: The first non-aqueous polyvinylidene fluoride adhesive is included in an amount ranging from 10 wt% to 70 wt%. The second non-aqueous polyimide adhesive is included in an amount ranging from 10 wt% to 70 wt%, and The water-based adhesive is included in an amount ranging from 10 wt% to 40 wt%.

6. The insulating composition of claim 1, wherein: The inorganic particles include at least one of Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof.

7. The insulating composition of claim 1, wherein: The weight ratio of the binder to the inorganic particles is in the range of 90:10 to 60:

40.

8. The insulating composition of claim 1, wherein: The solvent includes at least one of NMP, NEP, DMAc, and DMF, and combinations thereof.

9. The insulating composition of claim 1, wherein, The composition for the insulating layer is based on a total amount of 100 wt%. The adhesive is included in an amount ranging from 70 wt% to 90 wt%. The inorganic particles are included in an amount ranging from 10 wt% to 30 wt%; and The remainder includes the solvent.

10. The insulating composition of claim 1, wherein: The insulating composition has a viscosity in the range of 500 mPa·s to 2500 mPa·s at a temperature of 25°C and a shear rate of 10 / s.

11. The insulating composition of claim 1, wherein: The insulating composition has a thixotropic index value in the range of 0.1 to 0.

5.

12. An electrode for a rechargeable lithium battery, the electrode comprising: Electrode active material layer; An electrode current collector includes a coated area where the electrode active material layer is provided and an uncoated area where the electrode active material layer is not provided; as well as An insulating layer is configured to coat at least a portion of the uncoated area. The insulating layer comprises inorganic particles and an adhesive containing both a non-aqueous adhesive and an aqueous adhesive, wherein the non-aqueous adhesive comprises a first non-aqueous polyvinylidene fluoride adhesive and a second non-aqueous polyimide adhesive.

13. The electrode of claim 12, wherein: The crosslinking density is greater than or equal to 10%.

14. The electrode of claim 12, wherein: Based on 100% of the total area of ​​the insulating layer, after immersing the electrode in the electrolyte solution and soaking it at room temperature for 24 hours, the area of ​​the insulating layer that is detached is less than or equal to 10% of the total area.

15. The electrode of claim 12, wherein: Based on 100% of the total length of the insulating layer, after immersing the electrode in the electrolyte solution and soaking it at room temperature for 24 hours, the change in the length of the insulating layer is less than or equal to 5%.

16. The electrode of claim 12, wherein: The insulating layer covers a portion of the uncoated area and the burrs formed at the edges of the electrode active material layer.

17. The electrode of claim 12, wherein: The thickness of the insulating layer is in the range of 8 μm to 40 μm.

18. The electrode of claim 12, wherein: The electrode includes a positive electrode.

19. A rechargeable lithium battery, said rechargeable lithium battery comprising: Positive electrode; negative electrode; A diaphragm is located between the positive electrode and the negative electrode; as well as Electrolyte solution, Wherein, at least one of the positive electrode and the negative electrode comprises an electrode as described in any one of claims 12 to 18.

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