Electrode sheet and battery

Abstract

Provided in the present application are an electrode sheet and a battery. The electrode sheet comprises a current collector and a functional layer, wherein the functional layer comprises an organic / inorganic hybrid coating and an electrode active material layer. The organic / inorganic hybrid coating comprises an inorganic component A, a conductive agent component B and an organic component C; or, the functional layer comprises a mixture of an inorganic component A, a conductive agent component B, an organic component C and an electrode active material. The inorganic component A comprises an inorganic compound A1 and an inorganic compound A2, wherein the inorganic compound A1 comprises an inorganic lithium-containing compound, with the ionic conductivity of the inorganic lithium-containing compound being in the range of: 10-9 S / cm to 10-3 S / cm; and the inorganic compound A2 comprises an inorganic carbon-coated compound. The present application solves the problem of a large interface impedance between a safe coating and the electrode active material layer and the problems of the electronic / ionic conductivity of a safe coating being poor and a positive electrode coating being not uniform.

Description

Electrode tab and battery

[0001] The present application claims priority to the Chinese patent application No. 202410857682.1, filed on June 27, 2024, and entitled "Electrode tab and battery", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to an electrode tab and battery. BACKGROUND

[0003] To meet the popularization of portable electronic devices, the rapid development of electric vehicles and the need for large-scale energy storage, the market and consumers also have higher and higher requirements for the performance of lithium batteries. Batteries with high energy density, strong fast-charging capability, long cycle life and high safety performance are increasingly sought after. To improve the safety performance of lithium batteries, the current collector of the electrode tab has been coated with a safety coating. The improvement of the safety performance of the lithium battery by the safety coating depends on the thickness and composition of the safety coating. The increase of the thickness of the safety coating will reduce the contact resistance between the positive current collector and the negative electrode when the electrode is pierced or mechanically abused, and it is less likely to cause short circuit of the lithium battery. However, the increase of the thickness of the safety coating will also increase the internal resistance of the electrode tab, and will also reduce the energy density of the lithium battery. The material and composition of the safety coating are mostly a mixture of two or more of a binder, a conductive agent and an insulating material. The most commonly used binder is polyvinylidene fluoride which is non-electrochemically active. The most commonly used insulating material is aluminum oxide. Both have relatively high thermal stability, but do not have the ability to conduct electrons and lithium ions.

[0004] The electrode tab in the prior art is coated with a composite material coating of a binder, an insulating compound and a conductive agent. Although the safety performance of the battery is improved, the insulating compound and the binder in the coating are difficult to mix uniformly, and the slurry is prone to agglomeration, resulting in the defects of poor electronic / ion conductivity of the safety coating and uneven coating. SUMMARY

[0005] In view of the problems of poor electronic / ion conductivity and uneven coating of the safety coating, the present application provides an electrode tab and battery.

[0006] The technical solution adopted by the present application to solve the above technical problems is as follows:

[0007] In one aspect, the present application provides an electrode tab, comprising a current collector and a functional layer located on the surface of the current collector, the functional layer comprising an organic / inorganic hybrid coating and an electrode active material layer, the organic / inorganic hybrid coating comprising an inorganic component A, a conductive agent component B and an organic component C; or, the functional layer comprising a mixture of the inorganic component A, the conductive agent component B, the organic component C and the electrode active material.

[0008] wherein the inorganic component A comprises an inorganic compound A1 and an inorganic compound A2, the inorganic compound A1 comprises an inorganic lithium-containing compound, the inorganic lithium-containing compound has an ionic conductivity in the range of 10 -9 S / cm to 10 -3 S / cm; and the inorganic compound A2 comprises an inorganic carbon-coated compound.

[0009] Optionally, the inorganic carbon-coated compound has an ionic conductivity in the range of 10 -11 S / cm to 10 -8 S / cm.

[0010] Optionally, the organic / inorganic hybrid coating is disposed between the current collector and the electrode active material layer.

[0011] Optionally, the electrode active material layer is disposed between the current collector and the organic / inorganic hybrid coating.

[0012] Optionally, the organic / inorganic hybrid coating has a thickness in the range of 0.2 μm to 20 μm.

[0013] Optionally, the inorganic lithium-containing compound comprises one or more of Li3PO4, LiPO3, LiF, LiCl, LiBr, Li2SO4, Li3BO3, Li2B4O7, LiBO2, Li3OF, Li2CO3, Li3PS4, Li7PS6, Li 10 SiP2S 12 , Li 10 SnP2S 12 , Li6PS5Cl, Li6PS5Br, Li7PS5I, Li3N, Li7PN4, LiSi2N3.

[0014] Optionally, the inorganic carbon-coated compound comprises one or more of carbon-coated lithium iron phosphate, carbon-coated sodium iron phosphate pyrophosphate, carbon-coated silicon dioxide, carbon-coated silicon monoxide, carbon-coated silicon.

[0015] Optionally, the inorganic component A further comprises an inorganic compound A3, the inorganic compound A3 comprises one or more of Al2O3, γ-AlOOH, α-AlOOH, ZrO2, NASICON, Mg(OH)2, Ca(OH)2, MgO, CaO, BeO, ThO2.

[0016] Optionally, the inorganic component A further comprises an inorganic compound A4, the inorganic compound A4 comprises a first active material.

[0017] Optionally, the first active material comprises one or more of lithium cobalt oxide, nickel cobalt manganese material, nickel cobalt aluminum material, lithium iron phosphate, lithium-rich manganese-based material.

[0018] Optionally, the conductive agent component B comprises one or more of conductive carbon black-Li, carbon nanotube, carbon black, graphite, iron metal particles, aluminum metal particles, copper metal particles, manganese metal particles, carbon fiber, poly 3,4-ethylenedioxythiophene, sodium polystyrene sulfonate, polyaniline.

[0019] Optionally, the organic component C comprises one or more of polyvinylidene fluoride, polymethyl methacrylate, polyacrylonitrile, carboxymethyl cellulose, sodium carboxymethyl cellulose, butadiene styrene rubber, polyvinyl alcohol, polytetrafluoroethylene, polyolefin, fluorinated rubber, polyacrylamide, polymethyl methacrylate-butyl acrylate, polyvinylpyrrolidone, polyvinyl alcohol, polyethylene oxide, acrylic water-soluble glue, butadiene styrene latex, polyvinyl acetate, polyurethane, lithium cellulose acetate, lithium cellulose acetate butyrate, lithium cellulose acetate propionate, lithium cyanoethyl amylopectin, lithium cyanoethyl polyvinyl alcohol, lithium cyanoethyl cellulose, lithium cyanoethyl sucrose, lithium carboxymethyl cellulose.

[0020] Optionally, the weight percentage of the inorganic component A is 50% to 98%, the weight percentage of the conductive agent component B is 0.1% to 20%, and the weight percentage of the organic component C is 0.5% to 20%, based on the total mass of the organic / inorganic hybrid coating being 100%.

[0021] Optionally, the weight percentage of the inorganic component A1 is 4% to 85%, the weight percentage of the inorganic component A2 is 4% to 80%, the weight percentage of the inorganic component A3 is 0% to 90%, and the weight percentage of the inorganic component A4 is 0% to 80%, based on the total mass of the inorganic component A being 100%.

[0022] Optionally, the electrode active material layer comprises a second active material, a conductive material, and a binder; the second active material comprises a positive electrode active material or a negative electrode active material.

[0023] Optionally, the positive electrode active material comprises at least one of lithium cobalt oxide, nickel cobalt manganese material, nickel cobalt aluminum material, lithium iron phosphate, lithium-rich manganese-based material, modified material of at least one or more of sulfide.

[0024] Optionally, the negative electrode active material comprises at least one of graphite, hard carbon, silicon-based negative electrode, lithium metal, lithium alloy negative electrode, modified material of at least one or more of lithium titanate.

[0025] Another aspect of the present application provides a battery comprising the electrode sheet and the separator described above.

[0026] Optionally, the diaphragm surface is formed with a protective layer, and the protective layer comprises inorganic component A and organic component C.

[0027] According to the electrode provided by the present application, by arranging the electrode active material layer and the organic / inorganic hybrid coating layer on the surface of the current collector, the organic / inorganic hybrid coating layer comprises inorganic compound A1 and inorganic compound A2; the inorganic lithium-containing compound included in the inorganic compound A1 has high lithium ion conductivity; the problem of large interface impedance between the organic / inorganic hybrid coating layer and the electrode active material layer is solved; the inorganic component A2 comprises inorganic carbon-coated compound; the inorganic carbon-coated compound has certain electronic conductivity, ion conductivity and surface affinity, and the problems of poor electronic / ion conductivity and uneven coating of the organic / inorganic hybrid coating layer are solved. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer and more apparent, the present application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0029] The test methods used in the following embodiments are conventional methods unless otherwise specified; the materials, reagents and the like used are commercially available reagents and materials unless otherwise specified.

[0030] In one aspect, the present application provides an electrode tab, comprising a current collector and a functional layer on the surface of the current collector, the functional layer comprising an organic / inorganic hybrid coating layer and an electrode active material layer, the organic / inorganic hybrid coating layer comprising inorganic component A, conductive agent component B and organic component C; the inorganic component A comprises inorganic compound A1 and inorganic compound A2, the inorganic compound A1 comprises inorganic lithium-containing compound, and the ion conductivity of the inorganic lithium-containing compound ranges from 10 -9 S / cm to 10 -3 S / cm; the inorganic compound A2 comprises inorganic carbon-coated compound.

[0031] Specifically, the inorganic compound A1 includes an inorganic lithium-containing compound with high lithium ion conductivity; solves the problem of large interface impedance between the organic / inorganic hybrid coating and the electrode active material layer; the inorganic component A2 includes an inorganic carbon-coated compound, which has certain electronic conductivity, ionic conductivity and surface affinity, solving the problems of poor electronic / ionic conductivity and uneven coating of the organic / inorganic hybrid coating. Further, by synergistically optimizing the interface conduction and improving the stability of the coating through the inorganic compound A1 and the inorganic compound A2, the polarization heating during fast charging can be reduced, the short circuit expansion during the needle test can be inhibited, and the heat can be quickly dispersed, so that the safety performance of the lithium battery can be maximized while ensuring the energy density and fast charging capability of the battery.

[0032] Further, the electrode tab is a positive electrode tab or a negative electrode tab. The positive electrode tab includes a positive electrode current collector, which can be a metal foil or a composite current collector. As an example of the metal foil, an aluminum foil can be used; the composite current collector can include a polymer material base layer and a metal material layer formed on at least one surface of the polymer material base layer. As an example, the metal material can include one or more of aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy. As an example, the polymer material base layer can include, but is not limited to, one or more of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), and polyethylene (PE).

[0033] The negative electrode tab includes a negative electrode current collector, which can be a metal foil or a composite current collector. As an example of the metal foil, a copper foil, a copper alloy foil, an aluminum foil, or an aluminum alloy foil can be used. The composite current collector can include a polymer material base layer and a metal material layer formed on at least one side of the polymer material base layer. As an example, the metal material can include, but is not limited to, one or more of copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy. As an example, the polymer material base layer can include, but is not limited to, one or more of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), and polyethylene (PE).

[0034] In an embodiment, the ionic conductivity of the inorganic carbon-coated compound is in the range of 10 -11 S / cm to 10 -8 S / cm.

[0035] The ionic conductivity of the inorganic carbon-coated compound is in the range of 10 -11 S / cm to 10 -8When the inorganic carbon-coated compound has an electronic conductivity, an ionic conductivity and a surface affinity between 10-4 S / cm and 10-2 S / cm, the inorganic carbon-coated compound solves the problems of poor electronic / ionic conductivity and uneven coating of the organic / inorganic hybrid coating.

[0036] In an embodiment, the organic / inorganic hybrid coating is disposed between the current collector and the electrode active material layer.

[0037] Specifically, the organic / inorganic hybrid coating can be attached to the surface of the current collector by coating, spraying or the like.

[0038] The preparation method of the organic / inorganic hybrid coating includes the following steps: adding the inorganic component A, the conductive agent component B and the organic component C into a solvent in a certain proportion, and stirring and dispersing to obtain a mixed slurry; coating or spraying the mixed slurry on the surface of the current collector by using a coating machine, a spraying machine or an infiltration device; and finally drying at 60-120°C to obtain the current collector with the organic / inorganic hybrid coating.

[0039] The surface of the current collector with the organic / inorganic hybrid coating is further covered with the positive electrode slurry or the negative electrode slurry, and after drying, the positive electrode sheet or the negative electrode sheet is obtained by pressing and slitting; the solvent includes water, ethanol, N-methyl pyrrolidone (NMP), acetone, N,N-dimethylformamide (DMF), a phenyl solvent, ethylene glycol, furan and the like inorganic and / or organic solvents.

[0040] In another embodiment, the electrode active material layer is disposed between the current collector and the organic / inorganic hybrid coating.

[0041] Specifically, the positive electrode slurry or the negative electrode slurry is first coated on the surface of the current collector, and after drying, the positive electrode sheet or the negative electrode sheet is obtained, and then the inorganic component A, the conductive agent component B and the organic component C are added into a solvent in a certain proportion, and stirring and dispersing are performed to obtain a mixed slurry, the mixed slurry is coated or sprayed on the surface of the positive electrode sheet or the negative electrode sheet by using a coating machine, a spraying machine or an infiltration device, and finally drying is performed at 60-120°C, and the positive electrode sheet or the negative electrode sheet is obtained by pressing and slitting.

[0042] In an embodiment, the functional layer includes a mixture of the inorganic component A, the conductive agent component B, the organic component C and the electrode active material.

[0043] The electrode active material includes a positive electrode active material or a negative electrode active material.

[0044] Specifically, the inorganic component A, the conductive agent component B, the organic component C, the positive electrode material or the negative electrode material are added into a solvent in a certain proportion, and stirring and dispersing are performed to obtain a mixed slurry, the mixed slurry is then coated on the aluminum foil or copper foil current collector by slurry drawing, and after drying to remove the solvent, a solid functional layer is formed, and finally the positive electrode sheet or the negative electrode sheet is obtained by pressing and slitting.

[0045] In another embodiment, the functional layer can further comprise a mixture of the inorganic component A, the conductive agent component B, the organic component C, the electrode active material, the conductive material and the binder.

[0046] In an embodiment, the thickness of the organic / inorganic hybrid coating layer is 0.2 μm to 20 μm.

[0047] In a preferred embodiment, the thickness of the organic / inorganic hybrid coating layer is 2 μm to 10 μm; in particular, the thickness of the organic / inorganic hybrid coating layer is any one value or a range value consisting of any two point values selected from the group consisting of 0.2 μm, 1 μm, 2 μm, 4 μm, 6 μm, 8 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm and 20 μm.

[0048] In an embodiment, the inorganic lithium-containing compound comprises one or more of Li3PO4, LiPO3, LiF, LiCl, LiBr, Li2SO4, Li3BO3, Li2B4O7, LiBO2, Li3OF, Li2CO3, Li3PS4, Li7PS6, Li 10 SiP2S 12 , Li 10 SnP2S 12 , Li6PS5Cl, Li6PS5Br, Li7PS5I, Li3N, Li7PN4, LiSi2N3.

[0049] In particular, the inorganic lithium-containing compound of the present application is inexpensive, has strong chemical stability, and has good thermal stability in the temperature range of -40°C to 400°C, good ionic conductivity (ionic conductivity of 10 -9 S / cm to 10 -3 S / cm), and good compatibility with the active material coating layer, thereby solving the problem of poor compatibility between the organic / inorganic hybrid coating layer and the active material layer, and solving the problem of foil leakage of the electrode sheet by utilizing the affinity between the inorganic lithium-containing compound and the electrode active material layer or between the inorganic lithium-containing compound and the current collector, thereby reducing the internal resistance of the electrode sheet and ensuring that the battery has a small impedance; the inorganic lithium-containing compound component in the inorganic component A can avoid direct contact between the aluminum foil and the negative electrode sheet during needling, thereby ensuring the safety of the battery while ensuring a small impedance of the battery.

[0050] Further, the structure of the inorganic lithium-containing compound can be one or a combination of spherical particles, irregular particles, porous particles, filaments or fibers.

[0051] In an embodiment, the inorganic carbon-coated compound comprises one or more of carbon-coated lithium iron phosphate, carbon-coated sodium iron pyrophosphate phosphate, carbon-coated silicon dioxide, carbon-coated silicon monoxide, carbon-coated silicon.

[0052] Specifically, the affinity between the inorganic carbon-coated compound and the electrode active material layer or between the inorganic carbon-coated compound and the current collector solves the problem of foil leakage of the electrode sheet, reduces the internal resistance of the electrode sheet, ensures that the battery has a small impedance, and improves the electrical performance of the battery and the needle safety by adding the inorganic carbon-coated compound to the organic / inorganic hybrid coating.

[0053] In an embodiment, the inorganic component A further comprises an inorganic compound A3, and the inorganic compound A3 comprises one or more of Al2O3, γ-AlOOH, α-AlOOH, ZrO2, NASICON, Mg(OH)2, Ca(OH)2, MgO, CaO, BeO, and ThO2.

[0054] Specifically, the inorganic compound A3 as the filler can effectively prevent the short circuit behavior caused by the burr of the current collector.

[0055] In an embodiment, the inorganic component A further comprises an inorganic compound A4, and the inorganic compound A4 comprises a first active material.

[0056] Specifically, the first active material comprises one or more of lithium cobaltate, nickel-cobalt-manganese material, nickel-cobalt-aluminum material, lithium iron phosphate, and lithium-rich manganese-based material.

[0057] Further, the inorganic compound A4 further comprises an insulating ceramic material, and the insulating ceramic material comprises one or more of porcelain, alumina porcelain, mullite porcelain, modified silicon carbide ceramic, silicon nitride ceramic, aluminum nitride ceramic, lead borate glass ceramic, barium tin borate ceramic, and beryllium oxide ceramic; the average particle size of the insulating ceramic material is 1 nm to 10 μm.

[0058] If the particle size of the added insulating ceramic material is too large, the ion transmission in the electrolyte is hindered; if the particle size of the insulating ceramic material is too small, it is not conducive to the preparation of a film, and the technical effects of obtaining excellent mechanical properties and electrical properties cannot be achieved.

[0059] In an embodiment, the conductive agent component B comprises one or more of conductive carbon black-Li, carbon nanotube, carbon black, graphite, iron metal particle, aluminum metal particle, copper metal particle, manganese metal particle, carbon fiber, poly(3,4-ethylenedioxythiophene), polystyrene sodium sulfonate, and polyaniline.

[0060] The electrical conductivity of the conductive agent component B is in the range of 5 S / cm to 20 S / cm; the conductive network formed by the conductive agent component B further provides a fast channel for electron transmission, reduces the interface impedance, improves the rapid charge and discharge capability, and improves the electrical performance.

[0061] In an embodiment, the organic component C comprises one or more of polyvinylidene fluoride, polymethyl methacrylate, polyacrylonitrile, carboxymethyl cellulose, sodium carboxymethyl cellulose, styrene butadiene rubber, polyvinyl alcohol, polytetrafluoroethylene, polyolefins, fluorinated rubber, polyacrylamide, polymethyl methacrylate-butyl acrylate, polyvinylpyrrolidone, polyvinyl alcohol, polyethylene oxide, acrylic water-soluble glue, styrene butadiene latex, polyvinyl acetate, polyurethane, lithium cellulose acetate, lithium cellulose acetate butyrate, lithium cellulose acetate propionate, lithium cyanoethyl branched amylose, lithium cyanoethyl polyvinyl alcohol, lithium cyanoethyl cellulose, lithium cyanoethyl sucrose, lithium carboxymethyl cellulose.

[0062] The hybridization between the inorganic component A and the organic component C can improve the stability of the organic / inorganic hybrid coating and reduce the interface impedance.

[0063] In an embodiment, the weight percentage of the inorganic component A is 50% to 98%, the weight percentage of the conductive agent component B is 0.1% to 20%, and the weight percentage of the organic component C is 0.5% to 20%, based on the total mass of the organic / inorganic hybrid coating.

[0064] In a preferred embodiment, the weight percentage of the inorganic component A is 60% to 80%, and specifically, the weight percentage of the inorganic component A is any one of 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, or 98%, or a range value composed of any two of the above values.

[0065] In a preferred embodiment, the weight percentage of the conductive agent component B is 2% to 15%, and specifically, the weight percentage of the conductive agent component B is any one of 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20%, or a range value composed of any two of the above values.

[0066] In a preferred embodiment, the weight percentage of the organic component C is 5% to 15%, and specifically, the weight percentage of the organic component C is any one of 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20%, or a range value composed of any two of the above values.

[0067] In an embodiment, the inorganic component A1 accounts for 4-85% by weight, the inorganic component A2 accounts for 4-80% by weight, the inorganic component A3 accounts for 0-90% by weight, and the inorganic component A4 accounts for 0-80% by weight, based on 100% of the total mass of the inorganic component A.

[0068] In a preferred embodiment, the inorganic component A1 accounts for 20-60% by mass, specifically, the inorganic component A1 accounts for any one of 4%, 8%, 12%, 16%, 20%, 24%, 28%, 32%, 36%, 40%, 44%, 48%, 52%, 56%, 60%, 64%, 68%, 72%, 76%, 80%, or 85%, or a range value consisting of any two of the above values.

[0069] In a preferred embodiment, the inorganic component A2 accounts for 20-60% by mass, specifically, the inorganic component A2 accounts for any one of 4%, 8%, 12%, 16%, 20%, 24%, 28%, 32%, 36%, 40%, 44%, 48%, 52%, 56%, 60%, 64%, 68%, 72%, 76%, or 80%, or a range value consisting of any two of the above values.

[0070] In a preferred embodiment, the inorganic component A3 accounts for 30-60% by mass, specifically, the inorganic component A3 accounts for any one of 0%, 4%, 8%, 12%, 16%, 20%, 24%, 28%, 32%, 36%, 40%, 44%, 48%, 52%, 56%, 60%, 64%, 68%, 72%, 76%, 80%, 84%, 88%, or 90%, or a range value consisting of any two of the above values.

[0071] In a preferred embodiment, the inorganic component A4 accounts for 30-50% by mass, specifically, the inorganic component A4 accounts for any one of 0%, 4%, 8%, 12%, 16%, 20%, 24%, 28%, 32%, 36%, 40%, 44%, 48%, 52%, 56%, 60%, 64%, 68%, 72%, 76%, or 80%, or a range value consisting of any two of the above values.

[0072] In an embodiment, the electrode active material layer comprises a second active material, a conductive material, and a binder; the second active material comprises a positive electrode active material or a negative electrode active material.

[0073] Specifically, the conductive material includes positive electrode conductive material and negative electrode conductive material, the positive electrode conductive material includes one or more of carbon nanotube, graphene, carbon black and carbon fiber; the negative electrode conductive material includes one or more of conductive carbon sphere, acetylene black, conductive carbon black, ketjen black, single-walled carbon nanotube, multi-walled carbon nanotube, nanometer carbon fiber, graphene or conductive graphite sheet.

[0074] Specifically, the binder includes positive electrode binder and negative electrode binder, the positive electrode binder includes one or more of polytetrafluoroethylene, butadiene rubber, butyronitrile rubber, polystyrene block-polyethylene-arylene block-polystyrene, poly(tert-butyl acrylate)-b-poly(1,4-butadiene); the negative electrode binder includes one or more of polyacrylate, polyimide, polyamide, polyamide-imide, polyvinylidene fluoride, butadiene rubber, sodium alginate, polyvinyl alcohol, polytetrafluoroethylene, polyacrylonitrile, sodium carboxymethyl cellulose, potassium carboxymethyl cellulose, sodium hydroxymethyl cellulose or potassium hydroxymethyl cellulose.

[0075] In an embodiment, the positive electrode active material includes at least one of lithium cobaltate, nickel-cobalt-manganese material, nickel-cobalt-aluminum material, lithium iron phosphate, lithium-rich manganese-based, modified material of at least one of the above materials or modified material of sulfide.

[0076] In an embodiment, the negative electrode active material includes at least one of graphite, hard carbon, silicon-based negative electrode, lithium metal, lithium alloy negative electrode, lithium titanate, modified material of at least one of the above materials or modified material of lithium titanate.

[0077] Another aspect of the present application provides a battery containing the above-mentioned electrode sheet and separator.

[0078] Specifically, the electrode sheet includes positive electrode sheet and negative electrode sheet, the positive electrode sheet includes positive electrode active material, positive electrode conductive material, positive electrode binder and positive electrode current collector; the negative electrode sheet includes negative electrode active material, negative electrode conductive material, negative electrode binder and negative electrode current collector; the battery further includes a separator and an electrolyte.

[0079] Further, in an embodiment, the electrolyte of the present application is not limited to traditional liquid electrolyte, but can be any one of ionic liquid electrolyte, solid electrolyte, gelled electrolyte or water-containing lithium salt electrolyte.

[0080] The ionic liquid electrolyte comprises a lithium salt and an ionic liquid, the lithium salt is at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium trifluoromethylsulfonate, lithium perfluorobutylsulfonate, lithium chloroaluminate, lithium fluorosulfonylimide, lithium perfluoroalkyl trifluoroborate, lithium perfluoroalkyl pentafluorophosphate, lithium bisoxalate borate, lithium difluoro oxalate borate, lithium bis(fluorosulfonyl)imide, lithium chloride and lithium nitrate; the ionic liquid comprises one or more of imidazole ionic liquid, pyrrole ionic liquid, piperidine ionic liquid, quaternary ammonium ionic liquid, quaternary phosphorus ionic liquid and sulfonimide ionic liquid.

[0081] The electrolyte comprises a lithium salt and a solvent, the solvent can be one or more of deionized water, methyl ethyl carbonate, methyl propyl carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethyl propionate, other fluorine-containing, phosphorus-containing or sulfur-containing chain organic ester, acid anhydride, N-methyl pyrrolidone, N-methyl formamide, N-methyl acetamide, acetonitrile, nitrile organic matter, N,N-dimethyl formamide, cyclobutane sulfone, dimethyl sulfoxide, dimethyl sulfite, cyclic organic ester and fluorine-containing, sulfur-containing or unsaturated bond-containing cyclic organic ester.

[0082] The battery is composed of a separator, a positive electrode sheet, a negative electrode sheet, an electrolyte and a battery shell; the preparation method of the battery can be to prepare an electric core by winding or stacking the above-mentioned positive electrode sheet, solid electrolyte separator and negative electrode sheet, then place the electric core in a protective battery shell, add an electrolyte or ionic liquid after drying, and obtain the battery through processes such as packaging, aging and formation.

[0083] Specifically, the battery shell of the present application comprises any one of a steel shell, an aluminum shell, an aluminum plastic film shell, an aluminum alloy shell and an alloy steel shell.

[0084] In an embodiment, a protective layer is formed on the surface of the separator, the protective layer comprises one or more of inorganic component A and one or more of organic component C.

[0085] Specifically, any one of inorganic component A and any one of organic component C can be coated on the separator, and direct contact between the positive electrode and the negative electrode is avoided by coating inorganic component A and organic component C on the separator in mechanical abuse.

[0086] Further, the separator comprises a composite of one or more of polyethylene (PE), polypropylene (PP) and other polyolefin separators, polyimide, polyvinylidene fluoride separator, polyvinylidene fluoride-hexafluoropropylene separator, polyacrylonitrile separator and polymethyl methacrylate separator, and the thickness of the separator base film is 1 μm to 50 μm.

[0087] The application will be described in detail below with specific examples. It should be noted that the following examples are only used to illustrate the application and should not be regarded as limiting the scope of the application. If the specific technology or conditions are not specified in the examples, the technology or conditions described in the literature in the art or according to the product manual are used.

[0088] Example 1

[0089] Preparation of positive electrode tab:

[0090] Preparation of organic / inorganic hybrid coating:

[0091] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate iron), inorganic compound A3 (Al2O3), conductive agent component B (carbon nanotube), and organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone (NMP) in a mass ratio of 40:20:23:3:14 to obtain a mixed slurry 1. The mixed slurry 1 was coated on both sides of a 9 μm thick aluminum foil, with a coating thickness of 2 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0092] Polyvinylidene fluoride, conductive carbon black, and lithium cobaltate were added to N-methyl pyrrolidone (NMP) in a mass ratio of 1:1:98 to obtain a mixed slurry 2. The mixed slurry 2 was coated on the current collector with the organic / inorganic hybrid coating, and after drying, the tablet was pressed to obtain a positive electrode tab.

[0093] Preparation of negative electrode tab:

[0094] Natural graphite, conductive carbon black, sodium carboxymethyl cellulose, and butadiene rubber were added to deionized water in a mass ratio of 100:0.5:1:1, mixed and stirred to obtain a negative electrode slurry, which was coated and pressed to form a negative electrode tab.

[0095] Preparation of electrolyte:

[0096] LiPF6, ethylene carbonate (EC), diethyl carbonate (DEC), fluoroethylene carbonate (FEC), and ethyl propionate (EP) were configured to form a solution with a LiPF6 concentration of 1.2 mol / L, and a mass ratio of EC:DEC:FEC:EP of 65:20:10:5, to obtain an electrolyte.

[0097] The above positive electrode tab, separator, and negative electrode tab were wound to form an electric core, which was then placed in an aluminum-plastic film battery shell, dried, and then added with the electrolyte. After packaging, aging, and formation, a battery 456595 with a capacity of 4850 mAh was obtained.

[0098] Example 2

[0099] Example 2 includes most of the operations of Example 1, except that:

[0100] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate), inorganic compound A3 (Al2O3), conductive agent component B (carbon nanotubes), and organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone (NMP) in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of an aluminum foil with a thickness of 9 μιη, with a coating thickness of 2 μιη, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0101] Example 3

[0102] Example 3 includes most of the operations of Example 1, except that:

[0103] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate), inorganic compound A3 (Al2O3), conductive agent component B (carbon nanotubes), and organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone (NMP) in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of an aluminum foil with a thickness of 9 μιη, with a coating thickness of 2 μιη, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0104] Example 4

[0105] Example 4 includes most of the operations of Example 1, except that:

[0106] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate), inorganic compound A3 (Al2O3), conductive agent component B (carbon nanotubes), and organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone (NMP) in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of an aluminum foil with a thickness of 9 μιη, with a coating thickness of 2 μιη, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0107] Example 5

[0108] Example 5 includes most of the operations of Example 1, except that:

[0109] Inorganic compound A1 (Li3P04), inorganic compound A2 (carbon-coated sodium iron pyrophosphate), inorganic compound A3 (AI2O3), inorganic compound A4 (lithium cobaltate), conductive agent component B (carbon nanotube), organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone NMP in a mass ratio of 40:20:20:3:3:14 to obtain mixed slurry 1, mixed slurry 1 was coated on both sides of a 9 μm thick aluminum foil, the coating thickness was 10 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0110] Example 6

[0111] Example 6 includes most of the operations in Example 1, except that:

[0112] Inorganic compound A1 (Li3P04), inorganic compound A2 (carbon-coated sodium iron pyrophosphate), inorganic compound A3 (AI2O3), conductive agent component B (Ni nanoparticles), organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone NMP in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1, mixed slurry 1 was coated on both sides of a 9 μm thick aluminum foil, the coating thickness was 3 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0113] Example 7

[0114] Example 7 includes most of the operations in Example 1, except that:

[0115] Inorganic compound A1 (Li3P04), inorganic compound A2 (carbon-coated sodium iron phosphate), inorganic compound A3 (AI2O3), conductive agent component B (carbon nanotube), organic component C (PAA-Li) were added to N-methyl pyrrolidone NMP in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1, mixed slurry 1 was coated on both sides of a 9 μm thick aluminum foil, the coating thickness was 20 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0116] Example 8

[0117] Example 8 includes most of the operations in Example 1, except that:

[0118] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate iron), inorganic compound A3 (Al2O3), conductive agent component B (carbon nanotube), and organic component C (polyvinylidene fluoride) were added to N-methylpyrrolidone (NMP) in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of a 9-μm-thick aluminum foil, and the coating thickness was 10 μm. After drying at 60°C, a current collector with an organic / inorganic hybrid coating was obtained.

[0119] Example 9

[0120] Example 9 includes most of the operations in Example 1, except that:

[0121] Mixed slurry 2 was coated on both sides of a 9-μm-thick aluminum foil, and then, after drying at 60°C, a current collector with an electrode active material layer was obtained.

[0122] Mixed slurry 1 was coated on the current collector with the electrode active material layer, and the coating thickness was 3 μm. After drying, a positive electrode sheet was obtained by pressing.

[0123] Example 10

[0124] Example 10 includes most of the operations in Example 1, except that:

[0125] Mixed slurry 2 and mixed slurry 1 were mixed uniformly and coated on both sides of a 9-μm-thick aluminum foil, and the coating thickness was 20 μm. After drying at 60°C, a positive electrode sheet was obtained.

[0126] Example 11

[0127] Example 11 is to coat an organic / inorganic hybrid coating on a negative current collector. The specific test method is as follows:

[0128] Preparation of a negative electrode sheet:

[0129] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate iron), inorganic compound A3 (Al2O3), conductive agent component B (carbon nanotube), and organic component C (polyvinylidene fluoride) were added to N-methylpyrrolidone (NMP) in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of a 9-μm-thick aluminum foil, and the coating thickness was 10 μm. After drying at 60°C, a current collector with an organic / inorganic hybrid coating was obtained.

[0130] Sodium carboxymethyl cellulose, conductive carbon black and graphite are added into N-methyl pyrrolidone NMP in a mass ratio of 1:1:98 to obtain mixed slurry 2, the mixed slurry 2 is coated on the current collector with an organic / inorganic hybrid coating, and after drying, the negative electrode sheet is obtained by pressing.

[0131] Preparation of the positive electrode sheet:

[0132] Carbon nanotubes, conductive carbon black, polyvinylidene fluoride and lithium cobaltate are added into deionized water in a mass ratio of 0.5:0.5:1:98, mixed and stirred to obtain a positive electrode slurry, and the positive electrode sheet is prepared by coating and pressing.

[0133] Preparation of the electrolyte:

[0134] LiPF6, ethylene carbonate EC, diethyl carbonate DEC, fluoroethylene carbonate FEC and ethyl propionate EP are configured into a solution with a LiPF6 concentration of 1.2 mol / L, and the mass ratio of EC:DEC:FEC:EP is 65:20:10:5, to obtain the electrolyte.

[0135] The above positive electrode sheet, separator and negative electrode sheet are wound to form a battery cell, and then the battery cell is placed in an aluminum plastic film battery shell, dried, and then the electrolyte is added, and the battery is obtained after packaging, aging, formation and other processes.

[0136] Example 12

[0137] Example 12 includes most of the operations in Example 11, except that:

[0138] The mixed slurry 2 is coated on both sides of the 9-micron-thick copper foil, and then dried at 60°C to obtain a current collector with an electrode active material layer.

[0139] The mixed slurry 1 is coated on the current collector with the electrode active material layer, and after drying, the negative electrode sheet is obtained by pressing.

[0140] Example 13

[0141] Example 13 includes most of the operations in Example 11, except that:

[0142] The mixed slurry 2 and the mixed slurry 1 are mixed uniformly, coated on both sides of the 9-micron-thick copper foil, and then dried at 60°C to obtain the negative electrode sheet.

[0143] Comparative Example 1

[0144] Comparative Example 1 includes most of the operations in Example 1, except that:

[0145] The current collector surface is not provided with an organic / inorganic hybrid coating.

[0146] Comparative Example 2

[0147] Comparative Example 2 includes most of the operations in Example 1, except that:

[0148] Inorganic compound A2 (carbon-coated sodium pyrophosphate iron), inorganic compound A3 (AI2O3), conductive agent component B (carbon nanotube), and organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone NMP in a mass ratio of 60:23:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of an aluminum foil with a thickness of 9 μm, with a coating thickness of 2 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0149] Comparative Example 3

[0150] Comparative Example 3 includes most of the operations in Example 1, except that:

[0151] Inorganic compound A1 (Li3PO4), inorganic compound A3 (AI2O3), conductive agent component B (carbon nanotube), and organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone NMP in a mass ratio of 40:43:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of an aluminum foil with a thickness of 9 μm, with a coating thickness of 2 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0152] Comparative Example 4

[0153] Comparative Example 4 includes most of the operations in Example 1, except that:

[0154] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate iron), inorganic compound A3 (AI2O3), and conductive agent component B (carbon nanotube) were added to N-methyl pyrrolidone NMP in a mass ratio of 40:20:23:17 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of an aluminum foil with a thickness of 9 μm, with a coating thickness of 2 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0155] Comparative Example 5

[0156] Comparative Example 5 includes most of the operations in Example 1, except that:

[0157] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate iron), inorganic compound A3 (Al2O3), conductive agent component B (carbon nanotube), and organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone (NMP) in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of a 9-μm-thick aluminum foil, with a coating thickness of 0.1 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0158] Comparative Example 6

[0159] Comparative Example 6 includes most of the operations in Example 1, except that:

[0160] Inorganic compound A1 (Li3PO4), inorganic compound A2 (carbon-coated sodium pyrophosphate iron), inorganic compound A3 (Al2O3), conductive agent component B (carbon nanotube), and organic component C (polyvinylidene fluoride) were added to N-methyl pyrrolidone (NMP) in a mass ratio of 40:20:23:3:14 to obtain mixed slurry 1. Mixed slurry 1 was coated on both sides of a 9-μm-thick aluminum foil, with a coating thickness of 22 μm, and then dried at 60°C to obtain a current collector with an organic / inorganic hybrid coating.

[0161] Performance test

[0162] The lithium ion batteries produced in Examples 1-13 and Comparative Examples 1-8 above were subjected to corresponding performance tests according to the following methods, and the test results are shown in Table 1.

[0163] (1) Electrochemical impedance spectroscopy (EIS) test:

[0164] Test method: 0.5C constant current constant voltage charging to 3.95V, 0.01C cutoff. The EIS test parameters are set as follows:

[0165] Performance test method: step charging at an ambient temperature of 25±3°C;

[0166] 1) 3.0C-CC-CV-4.25V-2.5C cutoff

[0167] 2) 2.5C-CC-CV-4.35V-2.0C cutoff

[0168] 3) 2.0C-CC-CV-4.45V-1.5C cutoff

[0169] 4) 1.5C-CC-CV-4.50V-1.2C cutoff

[0170] 5) 1.2C - CC - CV - 4.545V - 0.13C cutoff

[0171] Rest for 5 minutes, then discharge the cells to 3.0V at 0.2C and 2C current respectively, the capacity is recorded as 0.2C discharge capacity and 2C discharge capacity.

[0172] Electrochemical performance is characterized by 2C discharge capacity (compared to 0.2C).

[0173] (2) Needle test:

[0174] Test method: using a conical steel needle with a diameter of 3mm, under the condition of 25±3℃, the steel needle is penetrated into the central part of the cell at a speed of 150mm / s until it is completely penetrated, and then the needle is withdrawn after keeping for 10min.

[0175] (3) Organic / inorganic hybrid coating dispersion uniformity and interface compatibility test:

[0176] Test method: the organic / inorganic hybrid coating dispersion uniformity and interface compatibility are comprehensively evaluated by SEM microstructure characterization and XPS hybridization between inorganic component A and organic component C.

[0177] The test results of the above experiments are shown in Table 1:

[0178] Table 1

[0179] From the test results in the above table, it can be seen that the electrode tab using the organic / inorganic hybrid coating helps to improve the needle safety performance of the battery, but the capacity retention rate is lost to varying degrees. According to the data provided in Examples 1-13, the mass fraction of each component of the organic / inorganic hybrid coating is within the range provided in the present application, which takes into account the safety and electrical performance of the lithium ion battery.

[0180] The needle penetration rate of the battery of Example 1 is 80%, the 2C discharge capacity is 85%, the diffusion impedance before cycling is 22mΩ, the contact impedance is 12mΩ, the diffusion impedance after cycling is 67mΩ, and the contact impedance is 75mΩ.

[0181] Comparative Example 1 does not contain an organic / inorganic hybrid coating, the needle penetration rate is 0, and the battery discharge capacity is low, which shows that the organic / inorganic hybrid coating provided on the electrode tab can improve the needle penetration rate of the electrode tab, improve the stability of the organic / inorganic hybrid coating, and reduce the interface impedance.

[0182] The organic / inorganic hybrid coating in Comparative Example 2 does not contain the inorganic lithium-containing compound component, the needle penetration rate is 50%, the pre-cycle diffusion impedance reaches 75 mΩ, the contact impedance reaches 82 mΩ, the diffusion impedance after cycling reaches 135 mΩ, and the contact impedance reaches 172 mΩ, which is much higher than that of Example 1, indicating that the addition of the inorganic lithium-containing compound component can greatly improve the charge transfer impedance and contact impedance of the electrode sheet, and increase the needle penetration rate.

[0183] The organic / inorganic hybrid coating in Comparative Example 3 does not contain the inorganic compound A2, resulting in agglomeration of the inorganic component, hindering ion conduction, reducing the 2C discharge capacity, and only having a needle penetration rate of 10%, indicating that A2 is important for maintaining the conductive network and thermal stability of the coating.

[0184] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electrode sheet, characterized in that, It includes a current collector and a functional layer located on the surface of the current collector. The functional layer includes an organic / inorganic hybrid coating and an electrode active material layer. The organic / inorganic hybrid coating includes an inorganic component A, a conductive agent component B, and an organic component C; or, the functional layer includes a mixture of an inorganic component A, a conductive agent component B, an organic component C, and an electrode active material. The inorganic component A comprises inorganic compound A1 and inorganic compound A2, wherein inorganic compound A1 comprises an inorganic lithium-containing compound, and the ionic conductivity of the inorganic lithium-containing compound is in the range of 10. -9 S / cm~10 -3 S / cm; The inorganic compound A2 includes inorganic carbon-coated compounds.

2. The electrode sheet according to claim 1, characterized in that: The ionic conductivity of the inorganic carbon-coated compound is in the range of 10. -11 S / cm~10 -8 S / cm.

3. The electrode sheet according to claim 1, characterized in that: The organic / inorganic hybrid coating is disposed between the current collector and the electrode active material layer.

4. The electrode sheet according to claim 1, characterized in that: The electrode active material layer is disposed between the current collector and the organic / inorganic hybrid coating.

5. The electrode sheet according to claim 1, characterized in that: The thickness of the organic / inorganic hybrid coating is 0.2 μm to 20 μm.

6. The electrode sheet according to claim 1, characterized in that: The inorganic lithium-containing compounds include Li3PO4, LiPO3, LiF, LiCl, LiBr, Li2SO4, Li3BO3, Li2B4O7, LiBO2, Li3OF, Li2CO3, Li3PS4, Li7PS6, and Li 10 SiP2S 12 Li 10 SnP2S 12 One or more of Li6PS5Cl, Li6PS5Br, Li7PS5I, Li3N, Li7PN4, and LiSi2N3.

7. The electrode sheet according to claim 1, characterized in that: The inorganic carbon-coated compound includes one or more of carbon-coated lithium iron phosphate, carbon-coated sodium iron phosphate pyrophosphate, carbon-coated silicon dioxide, carbon-coated silicon suboxide, and carbon-coated silicon.

8. The electrode sheet according to claim 1, characterized in that: The inorganic component A further includes inorganic compound A3, which includes one or more of Al2O3, γ-AlOOH, α-AlOOH, ZrO2, NASICON, Mg(OH)2, Ca(OH)2, MgO, CaO, BeO, and ThO2.

9. The electrode sheet according to claim 8, characterized in that: The inorganic component A further includes inorganic compound A4, which includes a first active material.

10. The electrode sheet according to claim 9, characterized in that: The first active material includes one or more of lithium cobalt oxide, nickel cobalt manganese material, nickel cobalt aluminum material, lithium iron phosphate, and lithium-rich manganese-based materials.

11. The electrode sheet according to claim 1, characterized in that: The conductive agent component B includes one or more of the following: conductive carbon black-Li, carbon nanotubes, carbon black, graphite, iron metal particles, aluminum metal particles, copper metal particles, manganese metal particles, carbon fiber, poly(3,4-ethylenedioxythiophene), sodium polystyrene sulfonate, and polyaniline.

12. The electrode sheet according to claim 1, characterized in that: The organic component C includes one or more of the following: polyvinylidene fluoride, polymethyl methacrylate, polyacrylonitrile, carboxymethyl cellulose, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyvinyl alcohol, polytetrafluoroethylene, polyolefins, fluorinated rubber, polyacrylamide, polymethyl methacrylate-butyl acrylate, polyvinylpyrrolidone, polyvinyl alcohol, polyethylene oxide, water-soluble acrylic adhesives, styrene-butadiene latex, polyvinyl acetate, polyurethane, lithium cellulose acetate, lithium cellulose butyrate acetate, lithium cellulose propionate acetate, cyanoethyl amylopectin lithium, cyanoethyl polyvinyl alcohol lithium, cyanoethyl cellulose lithium, cyanoethyl sucrose lithium, and lithium carboxymethyl cellulose.

13. The electrode sheet according to claim 1, characterized in that: The total mass of the organic / inorganic hybrid coating is 100%, the inorganic component A accounts for 50% to 98% by weight, the conductive agent component B accounts for 0.1% to 20% by weight, and the organic component C accounts for 0.5% to 20% by weight.

14. The electrode sheet according to claim 9, characterized in that: With the total mass of inorganic component A as 100%, the weight percentage of inorganic component A1 is 4% to 85%, the weight percentage of inorganic component A2 is 4% to 80%, the weight percentage of inorganic component A3 is 0% to 90%, and the weight percentage of inorganic component A4 is 0% to 80%.

15. The electrode sheet according to claim 1, characterized in that: The electrode active material layer includes a second active material, a conductive material, and a binder; the second active material includes a positive electrode active material or a negative electrode active material.

16. The electrode sheet according to claim 15, characterized in that: The positive electrode active material includes at least one modified material selected from lithium cobalt oxide, nickel cobalt manganese materials, nickel cobalt aluminum materials, lithium iron phosphate, lithium-rich manganese-based materials, and sulfides.

17. The electrode sheet according to claim 15, characterized in that: The negative electrode active material includes at least one of the following: graphite, hard carbon, silicon-based negative electrode, lithium metal, lithium alloy negative electrode, lithium titanate, and modified materials of at least one of these materials.

18. A battery, characterized in that: It contains the electrode sheet and diaphragm as described in any one of claims 1 to 17.

19. The battery according to claim 18, characterized in that: A protective layer is formed on the surface of the diaphragm, the protective layer comprising inorganic component A and organic component C.

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