Lithium ion battery

Abstract

The invention provides a lithium ion battery. The lithium ion battery comprises a positive electrode with a negative electrode active material layer, a negative electrode with a positive electrode active material layer, a diaphragm between the positive electrode and the negative electrode, and electrolyte filled between the positive electrode and the negative electrode, the electrolyte comprises 0.01 to 20 weight percent of an electrode crosstalk inhibitor; and an electrode crosstalk barrier layer is loaded on the diaphragm, the positive electrode or the negative electrode. Compared with the prior art, the electrode crosstalk inhibitor is added into the electrolyte, the electrode crosstalk blocking layer is loaded on the diaphragm, the positive electrode or the negative electrode, and under the action of the electrode crosstalk inhibitor and the electrode crosstalk blocking layer, the electrode crosstalk reaction generated between the electrodes can be effectively inhibited; therefore, the use performance of the lithium ion battery at high temperature can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of batteries, and specifically to a lithium-ion battery. Background Art

[0002] Lithium-ion batteries, with their advantages of long cycle life, high energy density, and low self-discharge, have found widespread application in consumer electronics, electric vehicles, and various energy storage devices. With market development, higher requirements are being placed on the operating environments of lithium-ion batteries, such as high-temperature environments. However, existing lithium-ion batteries on the market experience rapid capacity degradation in high-temperature environments, severely limiting their application in specialized equipment such as military, aerospace, mining, and exploration. Therefore, there is an urgent need to develop high-performance lithium-ion batteries that can withstand extreme high-temperature environments.

[0003] Existing technologies have attempted to improve the high-temperature performance of lithium-ion batteries by modifying the surface of electrode materials and using electrolyte additives. However, these improvements have been limited, effectively increasing the operating temperature from 25°C to approximately 45°C, which still falls short of meeting the demands of higher-temperature applications. The problem with these improvements is that they focus solely on the potential for thermal degradation of the electrodes themselves, leading to cycling failures, and fail to fundamentally address the issue of lithium-ion battery failure in high-temperature environments.

[0004] Chinese patent CN202310600993.5 discloses a method for manufacturing a lithium iron phosphate battery that can withstand ultra-high temperature storage at 95°C. By improving the aging process during the battery formation stage, the battery can be stored at 95°C without flatulence for 24 to 48 hours. However, the battery cannot operate stably in a 95°C temperature environment. The main problem with this solution is that it does not address the root cause of high-temperature attenuation at the material level. It only uses the increased aging temperature to form a thicker interface film to improve the battery's high-temperature storage performance to a certain extent. This seriously sacrifices the battery's electrochemical performance, resulting in the battery being able to only store but not cycle.

[0005] Considering the shortcomings of the above-mentioned prior art, it is necessary to fundamentally study the root cause of the failure problem of lithium-ion batteries in high-temperature environments (≤100°C) so as to find a more thorough solution. The inventors have published Boosting Battery Safety by Mitigating Thermal-Induced Crosstalk with a Bi-Continuous Separator in ADVANCED ENERGYMATERIALS and Simultaneously Blocking Chemical Crosstalk and Internal ShortCircuit via Gel-Stretching Derived Nanoporous Non-Shrinkage Separator for Safe Lithium-Ion Batteries in ADVANCEDMATERIALS and found that under thermal abuse conditions above 100°C, the internal electrode materials of the battery will thermally decompose and produce gases such as hydrogen, ethylene, and oxygen, thereby triggering thermal runaway of the battery. However, in the current prior art, there is no attention paid to what kind of reactions will occur in the electrodes within 100°C and their impact on the cycle performance of the battery in a high-temperature environment. The inventors have discovered for the first time that in high-temperature environments (≤100°C), new crosstalk species are generated at one electrode within the battery. These new crosstalk species migrate from one electrode to the other, causing side reactions that accelerate battery capacity decay. This side reaction triggered by electrode crosstalk is a major factor in preventing batteries from being used in high-temperature environments. Therefore, a lithium-ion battery is needed that can meet high-temperature requirements by suppressing electrode crosstalk. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the embodiments of the present application is to provide a lithium-ion battery that can meet the requirements of use in high-temperature environments by suppressing electrode crosstalk.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a lithium-ion battery, comprising a positive electrode having a cathode active material layer, a negative electrode having an anode active material, a separator between the positive electrode and the negative electrode, and an electrolyte filled between the positive electrode and the negative electrode;

[0008] The electrolyte contains 0.01 to 20 wt% of an electrode crosstalk inhibitor;

[0009] An electrode crosstalk barrier layer is loaded on the separator, the positive electrode or the negative electrode.

[0010] Preferably, the content of the electrode crosstalk inhibitor in the electrolyte is 0.02 to 10 wt%.

[0011] Preferably, the electrode crosstalk inhibitor is selected from vinylene carbonate, vinyl vinyl sulfite, fluoroethylene carbonate, vinyl sulfate, vinyl vinyl sulfite, 1,3-propiosulfonate, 1,4-butyrolactone, dimethyl sulfite, lithium difluorooxalatoborate, triethyl borate (TEB), tris(2,2,2-trifluoroethyl) borate, 2,4,6-trimethoxyboroxine, lithium cyanide tris(2,2,2-trifluoroethyl)borate, tris(2-cyanoethyl)borate, lithium tetrafluoro(fluoropropylene glycol) phosphate, lithium difluorophosphate, lithium difluorobisoxalatophosphate, lithium tetrafluoro(fluoropropylene glycol) phosphate, 1,2-bis(diphenylphosphine)ethane, tris(trimethylsilyl)phosphate, triethyl phosphite, tris(2,2, at least one of trifluoromethylsilyl)-2-nitropropoxysilane, tris(2-trifluoroethyl)phosphite, tripropargyl phosphate, dimethyldimethoxysilane, pentafluorophenyltriethoxysilane (TPS), trifluoropropylmethylcyclotrisiloxane, diphenyldimethoxysilane, (2-cyanoethyl)triethoxysilane, bis(trimethylsilyl)allylamine (NNB), 1-cyclohexenyloxytrimethylsilane, (trimethylsilyl)isothiocyanate, tetramethyldivinyldisiloxane, 4-(trimethylsilyloxy)-3-penten-2-one, adiponitrile, 1,3,6-hexanetrinitrile, tris(2-cyanoethyl)borate, ethoxy(pentafluoro)cyclotriphosphazene, tris(ethoxy)-tris(2,2,2-trifluoroethoxy)cyclotriphosphazene, and phenoxy(pentafluoro)cyclotriphosphazene.

[0012] Preferably, the barrier layer comprises a polymer porous skeleton and an inorganic filler.

[0013] Preferably, the mass percentage of the inorganic filler in the barrier layer is 0.01 to 90 wt%.

[0014] Preferably, the thickness of the barrier layer is 0.01 to 50 μm.

[0015] Preferably, the surface density of the barrier layer is 0.01 to 20 mg / cm2.

[0016] Preferably, the porosity of the barrier layer is 5 to 70%.

[0017] Preferably, the polymer is selected from at least one of polyvinyl chloride, polyethersulfone, polyamic acid, polybenzimidazole, poly(m-phenylene isophthalamide), poly(p-phenylene terephthalamide), polysiloxane, polytetrafluoroethylene, polyethylene, polypropylene, polyethylene glycol, polyethylene oxide, polypropylene oxide, polyethyleneimine, polyvinylidene fluoride, polymethyl methacrylate, polyacrylic acid, carboxymethyl fiber, chitosan, sodium alginate, polyvinyl alcohol, and polyvinyl pyrrolidone.

[0018] Preferably, the inorganic filler is at least one selected from titanium dioxide, zinc oxide, ferric oxide, manganese dioxide, silicon dioxide, aluminum oxide, boehmite, hydrotalcite, and montmorillonite.

[0019] In the lithium-ion battery provided by the present invention, the electrolyte contains 0.01 to 20 wt% of an electrode crosstalk inhibitor, and an electrode crosstalk barrier layer is applied to the separator, positive electrode, or negative electrode. The electrode crosstalk inhibitor and the electrode crosstalk barrier layer effectively suppress crosstalk reactions within the battery, significantly improving the battery's high-temperature cycling performance and enabling stable cycling of the lithium-ion battery at 100°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0021] Figure 1 Cycling performance of different batteries at 80°C and 4C;

[0022] Figure 2 Cycling performance of different batteries at 100°C and 1C conditions. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] The present invention provides a lithium-ion battery, comprising a positive electrode having a cathode active material layer, a negative electrode having an anode active material layer, a separator between the positive and negative electrodes, and an electrolyte filled between the positive and negative electrodes; the electrolyte contains 0.01 to 20 wt% of an electrode crosstalk inhibitor, and an electrode crosstalk barrier layer is loaded on the separator, the positive electrode, or the negative electrode.

[0025] The inventors have found for the first time that in a high temperature environment, a side reaction of electrode crosstalk will occur between the electrodes of lithium-ion batteries, that is, the transition metal Ma+ (M is Fe, Ni, Co, Mn, Al, Cu, Ti or Zr) (1≤a≤5) of the electrode on one side of the battery, the gas C b H c Od F e (0≤b, c, d or e≤5) or organic matter C f H g O h F i P j L i k (0≤f,g,h,I,j, ​​or k≤100) migrates to the other side of the electrode and causes performance degradation. The principle of electrode crosstalk in the present invention may be as follows: at high temperature, the electrolyte will undergo oxidative decomposition on the positive electrode side, resulting in the dissolution of the positive electrode transition metal and the release of lattice oxygen, thereby generating crosstalk species; on the negative electrode side, the electrolyte will undergo reductive decomposition and thermal decomposition of the negative electrode itself, which will also generate crosstalk species. The above-mentioned crosstalk species include transition metal Ma+ (M is Fe, Ni, Co, Mn, Al, Cu, Ti or Zr) (1≤a≤5), gas C b H c O d F e (0≤b, c, d or e≤5) or organic matter C f H g O h F i P j Li k (0 ≤ f, g, h, I, j, or k ≤ 100), etc. Crosstalk species from the positive electrode migrate to the negative electrode, damaging the negative electrode SEI film, increasing ion transfer impedance, inducing dendrites, and triggering heat-generating side reactions. Crosstalk species from the negative electrode migrate to the positive electrode, damaging the positive electrode CEI, triggering particle cracking and pulverization, and inducing heat-generating side reactions. All of these will accelerate battery capacity decay.

[0026] The lithium-ion battery provided by the present invention includes a positive electrode, a negative electrode, a separator and an electrolyte. The positive electrode includes a positive electrode current collector and a positive electrode material layer coated on the surface of the positive electrode current collector, and the positive electrode material layer includes a cathode active material, a binder and a conductive agent. The positive electrode current collector can be a metal foil, including but not limited to copper foil, gold foil, platinum foil, etc. The cathode active material can be lithium cobalt oxide (LiCoO2), lithium iron phosphate (LiFePO4), lithium nickel cobalt manganese oxide (LiNi 0.8 Co 0.1 Mn 0.1 ), lithium nickel cobalt aluminum oxide (LiNiCoAlO2) or polyanionic lithium compounds LiM a (PO4) b (M is at least one of Ni, Co, Mn, Fe, Ti, V, 0≤a≤5, 0≤b≤5), etc. The binder on the positive electrode can be polyvinylidene fluoride, and the conductive agent on the positive electrode can be carbon nanotubes, carbon fibers, graphene, graphite, amorphous carbon, etc. The surface capacity of the positive electrode is ≥5 mAhcm -2 .

[0027] In the present invention, the negative electrode of the battery includes a negative electrode current collector and a negative electrode material layer coated on the surface of the negative electrode current collector. The negative electrode material layer includes an anode active material, a binder and a conductive agent. The negative electrode current collector can be copper foil, gold foil, platinum foil, etc. The anode active material is a silicon-based material that can accept and release lithium ions, such as silicon oxide SiO x , wherein in silicon oxide, 0<X<2. The binder in the negative electrode can be sodium carboxymethyl cellulose, styrene-butadiene rubber, etc., and the conductive agent can be carbon nanotubes, carbon fibers, graphene, graphite, amorphous carbon, etc.

[0028] In the lithium-ion battery provided by the present invention, the diaphragm is a polymer porous film, and its material includes but is not limited to single-layer polypropylene (PP), single-layer polyethylene (PE), double-layer PP / PE, double-layer PP / PP and triple-layer PP / PE / PP diaphragms. The electrolyte includes an organic solvent, an electrolyte and an additive. The organic solvent includes but is not limited to at least one of a carbonate solvent, an ether solvent and a carboxylate solvent. Among them, the carbonate solvent includes but is not limited to dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, ethylene carbonate or propylene carbonate. The ether solvent includes but is not limited to tetrahydrofuran, 2-methyltetrahydrofuran, 1,3-dioxolane, dimethoxymethane, 1,2-dimethoxyethane or diethylene glycol dimethyl ether. The carboxylate solvent includes but is not limited to methyl formate, ethyl formate, ethyl acetate, propyl acetate or propyl propionate. Electrolytes include, but are not limited to, LiClO4, LiBF4, LiPF6, LiAsF6, LiCF3SO3, LiTDI, Li[(CF3SO2)2N], Li[(FSO2)2N], and Li[(C m F 2m+1 SO2)(C n F 2n+1 SO2)N], wherein m and n are natural numbers. According to the present invention, the molar concentration of the electrolyte can be 0.01mol / L to 2.0mol / L, preferably 0.02mol / L to 1.8mol / L, more preferably 0.04mol / L to 1.5mol / L, and more preferably 0.06mol / L to 1.2mol / L.

[0029] In the present invention, to suppress electrode crosstalk, the lithium-ion battery also includes an electrode crosstalk inhibitor and a barrier layer. The dual effects of the electrode crosstalk inhibitor and barrier layer not only suppress the generation of crosstalk species on the electrode side but also block the migration of crosstalk species between electrodes, thereby reducing battery capacity degradation and significantly improving the battery's high-temperature performance.

[0030] According to the present invention, the electrode crosstalk inhibitor is selected to contain at least one compound of elements such as F, S, P, N, O, and C, which can participate in the formation of a solid electrolyte film on the electrode surface, improve the structural stability of the electrode material, and reduce side reactions at the interface between the electrode and the electrolyte, thereby inhibiting the generation of crosstalk species. Preferably, the electrode crosstalk inhibitor is vinyl carbonate, vinyl sulfite, fluoroethylene carbonate, vinyl sulfate, 1,3 propiolactone, 1,4 butyrolactone, dimethyl sulfite, lithium difluorooxalatoborate, triethyl borate (TEB), tris(2,2,2-trifluoroethyl) borate, 2,4,6-trimethoxyboroxine, lithium cyanide tris(2,2,2-trifluoroethyl)borate, tris(2-cyanoethyl)borate, lithium tetrafluoro(fluoropropylene glycol) phosphate, lithium difluorophosphate, lithium difluorobisoxalatophosphate, lithium tetrafluoro(fluoropropylene glycol) phosphate, 1,2-bis(diphenylphosphine)ethane, tris(trimethylsilyl) phosphate, triethyl phosphite, tris(2,2,2-trifluoroethyl) phosphite, tripropargyl phosphate, dimethyldimethoxysilane, pentafluoro At least one of fluorophenyltriethoxysilane (TPS), trifluoropropylmethylcyclotrisiloxane, diphenyldimethoxysilane, (2-cyanoethyl)triethoxysilane, bis(trimethylsilyl)allylamine (NNB), 1-cyclohexenyloxytrimethylsilane, (trimethylsilyl)isothiocyanate, tetramethyldivinyldisiloxane, 4-(trimethylsilyloxy)-3-penten-2-one, adiponitrile, 1,3,6-hexanetrinitrile, tris(2-cyanoethyl)borate, ethoxy(pentafluoro)cyclotriphosphazene, tris(ethoxy)-tris(2,2,2-trifluoroethoxy)cyclotriphosphazene, and phenoxy(pentafluoro)cyclotriphosphazene; the electrode crosstalk inhibitor is dispersed or dissolved in the electrolyte; the mass percentage of the electrode crosstalk inhibitor in the electrolyte is 0.01 to 20 wt%, preferably 0.1 to 18 wt%, more preferably 0.2 to 15 wt%, more preferably 1.0 to 10 wt%, more preferably 2 to 8 wt%.

[0031] In the present invention, the barrier layer is composed of a polymer porous skeleton and an inorganic filler; the polymer is selected from polyvinyl chloride, polyethersulfone, polyamic acid, polybenzimidazole, polymethylene isophthalamide, polyp-phenylene terephthalamide, polysiloxane, polytetrafluoroethylene, polyethylene, polypropylene, polyethylene glycol, polyethylene oxide, polypropylene oxide, polyethyleneimine, polyvinylidene fluoride, polymethyl methacrylate, polyacrylic acid, carboxymethyl fiber, chitosan, sodium alginate, polyvinyl alcohol , polyvinyl pyrrolidone; the inorganic filler is selected from at least one of titanium dioxide, zinc oxide, ferric oxide, manganese dioxide, silicon dioxide, aluminum oxide, boehmite, hydrotalcite, and montmorillonite; the particle size of the inorganic filler is 0.005-10.0 μm, more preferably 0.01-1.0 μm, 0.02-0.9 μm, 0.05-0.8 μm; the mass percentage of the inorganic filler in the barrier layer is 0.01-90 wt%, more preferably 0.1-80 wt%, more preferably 0.5-70 wt%, more preferably 1-60 wt%, more preferably 2-50 wt%, more preferably 5-40 wt%, more preferably 10-30 wt%.

[0032] The barrier layer is loaded on the surface of the electrode or diaphragm by phase inversion. The thickness of the barrier layer is preferably 0.01-50.0 μm, more preferably 0.1-45.0 μm, more preferably 1-40.0 μm, more preferably 2-30.0 μm, more preferably 3-25.0 μm. The surface density of the barrier layer is preferably 0.01-20 mg / cm 2 , more preferably 0.1-18 mg / cm 2 , more preferably 1-15 mg / cm 2 , more preferably 2-10 mg / cm 2 , more preferably 3-10 mg / cm 2 , more preferably 3.5-9.5 mg / cm 2 The porosity is preferably 5 to 70%, more preferably 10 to 50%, and even more preferably 15 to 35%.

[0033] When preparing the barrier layer, the following steps are included: i) dissolving the polymer composition in a mixed solvent (preferably N-methylpyrrolidone and N,N-dimethylacetamide are mixed in a mass ratio of 1:1, and zinc oxide powder with a D50 particle size of 0.01 μm is added to the solvent as an inorganic filler and mixed evenly, and the amount of the inorganic filler is 5wt% of the weight of the barrier layer) to prepare a casting solution with a solid content of 15-20wt%; ii) loading the casting solution on one side of the diaphragm by surface coating and immersing it in a coagulation bath, which is a 1wt% methanol solution; iii) repeating step ii) to coat the other side of the diaphragm; iv) drying the coated diaphragm to obtain a composite diaphragm loaded with a barrier layer. According to the present invention, the mixed solvent is preferably a polar solvent, more preferably one or more of 1,4-dioxane, toluene, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, dichloromethane, 1,2-dichloroethane, chloroform, tetrahydrofuran, acetone, and ethyl acetate; the coagulation bath serves to solidify the precipitated polymer, and is preferably one or more of water, ethanol, methanol, sodium chloride solution, calcium chloride solution, lithium chloride solution, and potassium chloride solution.

[0034] The effects of the present invention are described below with reference to specific embodiments.

[0035] Example 1 Preparation of barrier layer

[0036] The steps are as follows: i) the polymer is polyvinyl chloride, and the polyvinyl chloride is dissolved in a mixed solvent (N-methylpyrrolidone / N,N-dimethylacetamide, mass ratio 1 / 1) to prepare a casting solution with a solid content of 15 wt%; ii) the casting solution is loaded on one side of the diaphragm by surface coating, and the diaphragm is a commercial polyethylene diaphragm, and immersed in a coagulation bath; iii) step ii) is repeated to coat the other side of the diaphragm; iv) the coated diaphragm is dried to obtain a composite diaphragm loaded with a barrier layer; the barrier layer has a thickness of 2.5 μm and an area density of 2.0 mg cm -2 , the porosity is 35%.

[0037] In Examples 2-14, different barrier layers were prepared using the same process as in Example 1. In Examples 2-5, a diaphragm was used as a carrier, and the diaphragm was a commercial polyethylene diaphragm. In Examples 6-10, the casting solution was applied to the ternary positive electrode, and in Examples 11-14, the casting solution was applied to the negative electrode, as shown in Table 1.

[0038] Table 1 Preparation of barrier layers with different compositions

[0039]

[0040]

[0041]

[0042] Examples 15-24 prepared electrolytes containing different components and inhibitor contents, which are listed in Table 2.

[0043] Table 2 Preparation of electrolytes with different components and inhibitor contents

[0044]

[0045]

[0046] Examples 25-35 Preparation of Batteries

[0047] To prepare the battery, the positive electrode, separator, and negative electrode were stacked and wound in sequence, and then the electrolyte was injected. The battery was then aged and sealed in the conventional manner to produce a 5Ah lithium-ion battery. Batteries of Examples 25-35 were prepared using different positive electrodes, negative electrodes, electrolytes, and separators, as listed in Table 3.

[0048] Table 3 Preparation of lithium-ion batteries with different positive electrodes, negative electrodes and separators

[0049]

[0050] To prepare the batteries for Comparative Examples 1-3, the positive electrode, separator, and negative electrode were stacked and wound in sequence, and then electrolyte was injected. The batteries were then aged and sealed in the conventional manner to produce 5Ah lithium-ion batteries. Batteries for Examples 25-35 were prepared using different positive electrodes, negative electrodes, electrolytes, and separators, as shown in Table 4.

[0051] Table 4 Preparation of lithium-ion batteries without inhibitors and barrier layers

[0052]

[0053] The performance of the lithium-ion battery was tested at different temperatures and rates, with a voltage range of 2.7-4.2V for 200 charge and discharge cycle tests. The capacity retention results are shown in Table 5.

[0054] Table 5 Test performance of lithium-ion batteries

[0055]

[0056]

[0057]

[0058] For Examples 35-40, the batteries (80°C, 1C) corresponding to Examples 25-30 were disassembled after 200 cycle tests, and the content of crosstalk species (Ni, Co, and Mn transition metals originating from the positive electrode side) on the negative electrode side was tested using the inductively coupled plasma (ICP) method. The test results are shown in Table 6.

[0059] The cycle performance of Example 26 and Comparative Example 2 was tested at 80°C and 4°C. Figure 1 As shown; the cycle performance of Example 28 and Comparative Example 1 was tested at 100 ° C and 1C conditions, as shown Figure 2 As shown, the battery provided by the present invention maintains a relatively ideal capacity at high temperatures.

[0060] For Comparative Examples 4-6, the batteries corresponding to Comparative Examples 1-3 (80°C, 1C) were disassembled after 200 cycle tests, and the content of crosstalk species (Ni, Co, and Mn transition metals originating from the positive electrode side) on the negative electrode side was tested using the inductively coupled plasma (ICP) method. The test results are shown in Table 6.

[0061] By comparison, Examples 35-40 significantly inhibited the generation of crosstalk species, thereby significantly improving the cycle performance of the battery at high temperature.

[0062] Table 6. Negative electrode crosstalk species content (ppm) of different batteries after 200 cycles at 80°C and 1C

[0063]

[0064] Although the embodiments of the present application are disclosed above, the present application is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims.

Claims

1. A lithium-ion battery, characterized in that: The invention comprises a positive electrode having a cathode active material layer, a negative electrode having an anode active material layer, a separator between the positive electrode and the negative electrode, and an electrolyte filled between the positive electrode and the negative electrode; The electrolyte contains 0.01 to 20 wt% of an electrode crosstalk inhibitor; An electrode crosstalk barrier layer is loaded on the separator, the positive electrode or the negative electrode.

2. The lithium-ion battery according to claim 1, wherein The content of the electrode crosstalk inhibitor in the electrolyte is 0.02-10 wt %.

3. The lithium-ion battery according to claim 1, wherein The electrode crosstalk inhibitor is selected from vinylene carbonate, vinyl vinyl sulfite, fluoroethylene carbonate, vinyl sulfate, vinyl vinyl sulfite, 1,3-propiosulfonate, 1,4-butyrolactone, dimethyl sulfite, lithium difluorooxalatoborate, triethyl borate (TEB), tris(2,2,2-trifluoroethyl) borate, 2,4,6-trimethoxyboroxine, lithium cyanide tris(2,2,2-trifluoroethyl)borate, tris(2-cyanoethyl)borate, lithium tetrafluoro(fluoropropylene glycol) phosphate, lithium difluorophosphate, lithium difluorobisoxalatophosphate, lithium tetrafluoro(fluoropropylene glycol) phosphate, 1,2-bis(diphenylphosphine)ethane, tris(trimethylsilyl)phosphate, triethyl phosphite, tris(2,2,2-trifluoroethyl)bo ... 2,4,6-trimethoxyboroxine, tris(2,2,2-trifluoroethyl)borate, tris(2-cyanoethyl)borate, 2,4,6-trimethoxyboroxine, tris(2,2,2-trifluoroethyl)borate, tris(2-cyanoethyl)borate, 2,4,6-trimethoxyboroxine, tris(2,2,2-trifluoroethyl)bo at least one of trifluoroethyl) phosphite, tripropargyl phosphate, dimethyldimethoxysilane, pentafluorophenyltriethoxysilane (TPS), trifluoropropylmethylcyclotrisiloxane, diphenyldimethoxysilane, (2-cyanoethyl)triethoxysilane, bis(trimethylsilyl)allylamine (NNB), 1-cyclohexenyloxytrimethylsilane, (trimethylsilyl)isothiocyanate, tetramethyldivinyldisiloxane, 4-(trimethylsilyloxy)-3-penten-2-one, adiponitrile, 1,3,6-hexanetrinitrile, tris(2-cyanoethyl)borate, ethoxy(pentafluoro)cyclotriphosphazene, tris(ethoxy)-tris(2,2,2-trifluoroethoxy)cyclotriphosphazene, and phenoxy(pentafluoro)cyclotriphosphazene.

4. The lithium-ion battery according to any one of claims 1 to 3, characterized in that The barrier layer includes a polymer porous skeleton and an inorganic filler.

5. The lithium-ion battery according to claim 4, characterized in that The mass percentage of the inorganic filler in the barrier layer is 0.01 to 90 wt %.

6. The lithium-ion battery according to claim 5, characterized in that The thickness of the barrier layer is 0.01 to 50 μm.

7. The lithium-ion battery according to claim 6, characterized in that The surface density of the barrier layer is 0.01 to 20 mg / cm 2 .

8. The lithium-ion battery according to claim 7, characterized in that The porosity of the barrier layer is 5-70%.

9. The lithium-ion battery according to claim 8, characterized in that The polymer is selected from at least one of polyvinyl chloride, polyethersulfone, polyamic acid, polybenzimidazole, poly(m-phenylene isophthalamide), poly(p-phenylene terephthalamide), polysiloxane, polytetrafluoroethylene, polyethylene, polypropylene, polyethylene glycol, polyethylene oxide, polypropylene oxide, polyethyleneimine, polyvinylidene fluoride, polymethyl methacrylate, polyacrylic acid, carboxymethyl fiber, chitosan, sodium alginate, polyvinyl alcohol, and polyvinyl pyrrolidone.

10. The lithium-ion battery according to claim 9, characterized in that The inorganic filler is selected from at least one of titanium dioxide, zinc oxide, ferric oxide, manganese dioxide, silicon dioxide, aluminum oxide, boehmite, hydrotalcite and montmorillonite.

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