Electrode plate and battery

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By setting a solid electrolyte layer on the inner wall of the electrode particle channel of the semi-solid battery to isolate the liquid electrolyte layer, the problem of disorderly mixing of liquid electrolytes and solid electrolytes in traditional semi-solid battery is solved, and the safety, rate performance and power performance of the battery are improved.

CN119890218APending Publication Date: 2025-04-25RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD

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Patent Information

Application Number: CN202311392428.0
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2023-10-25
Publication Date: 2025-04-25

AI Technical Summary

Technical Problem

The electrode particles of traditional semi-solid state batteries come in contact with both the liquid electrolyte and the solid electrolyte, resulting in the liquid electrolyte being mixed in disorderly state, affecting the safety, rate performance and power performance of the battery.

Method used

By providing a solid electrolyte layer on the inner wall of the pore between the electrode particles, the liquid electrolyte layer is isolated from the electrode particles, and the orderly distribution of the liquid electrolyte and the solid electrolyte is achieved.

Benefits of technology

The opening temperature of the battery's thermal runaway abnormal heat generation is increased, the resistance to lithium dendrites is enhanced, the oxidative and exothermic heat of the positive electrode is suppressed, the internal resistance of the battery is reduced, the rate performance and power performance are improved, and the high safety of the battery is ensured.

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Abstract

The invention discloses an electrode plate and a battery. The electrode plate comprises a first composite material layer, a current collector and a second composite material layer, the first composite material layer and the second composite material layer respectively cover the upper surface and the lower surface of the current collector; the first composite material layer and the second composite material layer comprise electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core body; the solid electrolyte is divided into a solid electrolyte layer and a solid electrolyte core body through the liquid electrolyte layer; the solid electrolyte layer is attached to the inner wall of a pore channel formed among the electrode particles, and the liquid electrolyte layer in the pore channel is isolated from the electrode particles. The thermal stability of a passivation film on the surface of an electrode particle in the semi-solid battery can be improved, the resistance of the semi-solid battery to lithium dendrites is improved, the compactness of a coating layer on the surface of a positive electrode particle is improved, the long-range transport rate of lithium ions between a positive electrode and a negative electrode is improved, and the transport impedance of the lithium ions in a solid electrolyte layer is reduced.

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Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and more specifically, relates to an electrode sheet and a battery using the electrode sheet. Background Art

[0002] The electrolyte used in traditional lithium-ion batteries is liquid, including lithium salts and carbonate solvents. Compared with other solvents, carbonate solvents can provide the best overall electrical performance for batteries, but they are highly flammable, have low thermal stability, and are prone to safety accidents.

[0003] Semi-solid batteries can improve the thermal stability of electrolytes and reduce the flammability of electrolytes by replacing part of the liquid electrolyte with a solid electrolyte, but their effect on improving battery safety is limited. The electrode particles of traditional semi-solid batteries are in contact with both liquid electrolytes and solid electrolytes; and inside the pores between the electrode particles, the liquid electrolyte and the solid electrolyte are in a disordered mixed state. The thermal stability of the passivation film on the surface of the electrode particles of traditional semi-solid batteries is poor, the resistance to lithium dendrites is insufficient, the density of the surface coating of the positive electrode particles is insufficient, the efficiency of lithium ion migration in the solid electrolyte layer is affected by the thickness of the solid electrolyte layer, and in the electrode pores of traditional semi-solid batteries, the long-range transport of lithium ions between the positive and negative electrodes is hindered by the influence of numerous solid electrolyte particles in the liquid electrolyte, which affects the safety, rate performance and power performance of semi-solid batteries.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide an electrode sheet and a battery using the electrode sheet, so as to improve the safety, rate performance and power performance of a semi-solid battery.

[0006] To achieve the above-mentioned purpose, the present invention provides an electrode sheet and a battery using the electrode sheet.

[0007] According to a first aspect of the present invention, an electrode sheet is provided, comprising:

[0008] a first composite material layer, a current collector, and a second composite material layer;

[0009] The first composite material layer and the second composite material layer are respectively covered on the upper surface and the lower surface of the current collector;

[0010] The first composite material layer and the second composite material layer include:

[0011] Electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core;

[0012] The solid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, isolating the liquid electrolyte layer in the pores from the electrode particles;

[0013] The liquid electrolyte layer is disposed between the solid electrolyte layer and the solid electrolyte core to isolate the solid electrolyte layer from the solid electrolyte core.

[0014] Optionally, the electrode particles include an active material, a conductive agent and a binder.

[0015] Optionally, the current collector is a metal or an alloy;

[0016] The metal includes at least one of aluminum, copper, nickel and titanium;

[0017] The alloy includes at least one of aluminum alloy, copper alloy, nickel alloy and titanium alloy.

[0018] Optionally, the solid electrolyte is a product of solidified precursor solution;

[0019] The precursor solution includes an initiator, a polymer monomer and a liquid electrolyte.

[0020] Optionally, the active material includes at least LiFePO4, LiNi x Co y Mn (1-x-y) O2, LiMn2O4, graphite and SiO x One of the following;

[0021] Among them, LiNi x Co y Mn (1-x-y) In O2, 0≤x+y≤1, SiO x Where 0≤x≤2.

[0022] Optionally, the conductive agent includes at least one of carbon black, carbon nanotubes and graphene.

[0023] Optionally, the binder includes at least one of PVDF, CMC, SBR, PAA and LiPAA.

[0024] Optionally, the liquid electrolyte comprises a lithium salt and a solvent;

[0025] The lithium salt includes at least one of LiPF6, LiBF4, LiClO4, LiBOB, LiDFOB, LiFSI and LiTFSI;

[0026] The solvent includes at least one of EC, DMC, DEC, EMC and PC.

[0027] Optionally, the polymer monomer includes at least one of PEGA, PEGMA, EGPEA, MMA, PEGMEM, TEGDA, PEGDA, TPGDA, EGDMA, PEGDMA, HDDA, TEGDMA, BDDA, BEMA, TMPTA, TMPTMA, ETPTA, PETEA, TAEP, FPCA, VC and DOL;

[0028] The initiator includes at least one of AIBN, ABVN, BPO, LPO, TAPP, TBPP and H2O.

[0029] According to a second aspect of the present invention, a battery is provided, comprising the electrode sheet as described in any one of the first aspects.

[0030] The beneficial effects of the present invention are as follows: the present invention implements a multi-layer design for the microscopic distribution of liquid electrolyte and solid electrolyte in the electrode sheet of the semi-solid battery, and isolates the electrode particles and the liquid electrolyte layer by a solid electrolyte layer arranged on the inner wall of the pore; compared with liquid electrolyte, the thermal stability of the passivation film generated by the polymer solid electrolyte and the electrode particles is higher, thereby increasing the opening temperature of abnormal heat generation due to thermal runaway of the battery; and the polymer solid electrolyte can form a dense coating layer on the surface of the positive electrode particles, which is beneficial to inhibit the oxidation heat release of the liquid electrolyte on the surface of the positive electrode particles, and inhibit the release of active oxygen in the positive electrode, thereby facilitating the increase of the initiation temperature of thermal runaway of the battery; at the same time, the high mechanical strength of the polymer solid electrolyte can inhibit the growth of lithium dendrites on the surface of the negative electrode particles, improve the resistance to lithium dendrites, and is beneficial to inhibit the short circuit caused by lithium dendrites piercing the diaphragm, and alleviate the side reaction of the electrolyte and lithium , which is beneficial to increase the triggering temperature of battery thermal runaway and improve the safety of the battery; the present invention can make the long-range transport of lithium ions in the pure liquid phase through the layered design of the liquid electrolyte layer and the solid electrolyte layer, which is beneficial to increase the transmission rate of lithium ions in the electrode pores, thereby reducing the internal resistance of the semi-solid battery and improving the rate performance and power performance of the semi-solid battery; the present invention separates the solid electrolyte into a solid electrolyte layer and a solid electrolyte core through the liquid electrolyte layer in the pores between the electrode particles, which can reduce the thickness of the solid electrolyte in contact with the electrode particles, which is beneficial to reduce the transmission impedance of lithium ions in the solid electrolyte layer, thereby reducing the internal resistance of the semi-solid battery and improving the rate performance and power performance of the semi-solid battery; at the same time, this structure does not reduce the total amount of solid electrolyte, that is, does not increase the amount of liquid electrolyte, thereby ensuring the high safety of the semi-solid battery.

[0031] The system of the present invention has other characteristics and advantages, which will be apparent from the drawings incorporated herein and the following detailed description, or will be described in detail in the drawings incorporated herein and the following detailed description, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, in which like reference numerals generally represent like components.

[0033] Figure 1 A schematic diagram of an electrode sheet according to Embodiment 1 of the present invention is shown.

[0034] Description of reference numerals:

[0035] 100. Current collector, 200. Composite material layer, 300. Composite material layer, 210. Local cross section of composite material layer 200, 211. Electrode particles, 212. Electrode particles, 213. Passivation film, 214. Solid electrolyte layer, 215. Liquid electrolyte layer, 216. Solid electrolyte core. DETAILED DESCRIPTION

[0036] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0037] An electrode sheet according to the present invention comprises:

[0038] a first composite material layer, a current collector, and a second composite material layer;

[0039] The first composite material layer and the second composite material layer cover the upper surface and the lower surface of the current collector respectively;

[0040] The first composite material layer and the second composite material layer include:

[0041] Electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core;

[0042] The solid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, isolating the liquid electrolyte layer in the pores from the electrode particles;

[0043] The liquid electrolyte layer is arranged between the solid electrolyte layer and the solid electrolyte core to isolate the solid electrolyte layer from the solid electrolyte core.

[0044] Specifically, the electrode sheet of the present invention includes a first composite material layer, a current collector and a second composite material layer; the first composite material layer and the second composite material layer cover the upper surface and the lower surface of the current collector respectively; the first composite material layer and the second composite material layer include electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core, and a pore is formed between the electrode particles, and the solid electrolyte layer is arranged on the inner wall of the pore, thereby isolating the liquid electrolyte arranged in the pore from the electrode particles. The electrode particles in the electrode sheet of the traditional semi-solid battery are in contact with both the liquid electrolyte and the solid electrolyte, and in the pore between the electrode particles, the liquid electrolyte and the solid electrolyte are in a disordered mixed state. The present invention isolates the liquid electrolyte layer from the electrode particles by arranging a solid electrolyte layer on the inner wall of the pore, and orderly distributes the liquid electrolyte and the solid electrolyte. Compared with the liquid electrolyte, the thermal stability of the passivation film generated by the polymer solid electrolyte and the electrode particles is higher, thereby increasing the opening temperature of abnormal heat generation of the battery thermal runaway; and the polymer solid electrolyte can form a dense coating layer on the surface of the positive electrode particles, which is beneficial to inhibiting the oxidation heat release of the liquid electrolyte on the surface of the positive electrode particles and inhibiting the release of active oxygen in the positive electrode, thereby facilitating increasing the initiation temperature of the battery thermal runaway; at the same time, the high mechanical strength of the polymer solid electrolyte can inhibit the growth of lithium dendrites on the surface of the negative electrode particles, improves the resistance to lithium dendrites, is beneficial to inhibiting the short circuit caused by the lithium dendrites piercing the diaphragm, and alleviates the side reaction of the electrolyte and lithium, thereby facilitating increasing the initiation temperature of the battery thermal runaway and improving the safety of the battery.

[0045] The present invention separates the solid electrolyte into a solid electrolyte layer and a solid electrolyte core through a liquid electrolyte layer in the pores between the electrode particles, which can reduce the thickness of the solid electrolyte in contact with the electrode particles, which is beneficial to reducing the transmission impedance of lithium ions in the solid electrolyte layer, thereby reducing the internal resistance of the semi-solid battery and improving the rate performance and power performance of the semi-solid battery; at the same time, this structure does not reduce the total amount of solid electrolyte, that is, does not increase the amount of liquid electrolyte, thereby ensuring the high safety of the semi-solid battery.

[0046] In one example, the electrode particles include an active material, a conductive agent, and a binder.

[0047] Specifically, the electrode particles include active materials, conductive agents and binders, that is, the active materials are electrode particles, the conductive agents are also electrode particles, and the binders are also electrode particles.

[0048] In one example, the current collector is a metal or an alloy;

[0049] The metal includes at least one of aluminum, copper, nickel and titanium;

[0050] The alloy includes at least one of an aluminum alloy, a copper alloy, a nickel alloy and a titanium alloy.

[0051] Specifically, the current collector is a metal or an alloy, the metals include aluminum, copper, nickel and titanium, and the alloys include aluminum alloys, copper alloys, nickel alloys and titanium alloys; the current collector can be a single metal or alloy, or it can be composed of multiple groups of metals or alloys stacked together, for example, the current collector is composed of a layer of aluminum sheet and a layer of copper sheet stacked together, or a layer of aluminum alloy and a layer of copper alloy stacked together.

[0052] In one example, the solid electrolyte is a product of solidification of a precursor solution;

[0053] The precursor solution includes an initiator, a polymer monomer and a liquid electrolyte.

[0054] Specifically, the solid electrolyte is a product of solidified precursor liquid, the precursor liquid includes an initiator, a polymer monomer and a liquid electrolyte, and the liquid electrolyte in the precursor liquid may be the same as or different from the liquid electrolyte in the liquid electrolyte layer.

[0055] In one example, the active material includes at least LiFePO4, LiNi x Co y Mn (1-x-y) O2, LiMn2O4, graphite and SiO x One of the following;

[0056] Among them, LiNi x Co y Mn (1-x-y) In O2, 0≤x+y≤1, SiO x Where 0≤x≤2.

[0057] Specifically, the active material can be LiFePO4 (lithium iron phosphate), LiNi x Co y Mn (1-x-y) O2 (lithium nickel cobalt manganese oxide), LiMn2O4 (lithium manganese oxide), graphite and SiO x (silicon oxide), or LiFePO4, LiNi x Co y Mn (1-x-y) O2, LiMn2O4, graphite and SiO x For example, one electrode sheet contains both LiFePO4 and LiNi x Co y Mn (1-x-y) O2.

[0058] In one example, the conductive agent includes at least one of carbon black, carbon nanotubes, and graphene.

[0059] Specifically, the conductive agent is one of carbon black, carbon nanotubes and graphene, or two or more of carbon black, carbon nanotubes and graphene. For example, the conductive agent in one electrode sheet contains both carbon black and graphene.

[0060] In one example, the binder includes at least one of PVDF, CMC, SBR, PAA, and LiPAA.

[0061] Specifically, the binder is one of PVDF (polyvinylidene fluoride), CMC (sodium carboxymethyl cellulose), SBR (styrene-butadiene rubber), PAA (polyacrylic acid) and LiPAA (lithium polyacrylate), or it can be two or more of PVDF, CMC, SBR, PAA and LiPAA. For example, the binder in an electrode sheet contains both PVDF and CMC.

[0062] In one example, the liquid electrolyte includes:

[0063] Lithium salts and solvents;

[0064] The lithium salt includes at least one of LiPF6, LiBF4, LiClO4, LiBOB, LiDFOB, LiFSI and LiTFSI;

[0065] The solvent includes at least one of EC, DMC, DEC, EMC and PC.

[0066] Specifically, the liquid electrolyte includes a lithium salt and a solvent, the lithium salt is one of LiPF6 (lithium hexafluorophosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiBOB (lithium bis(oxalatoborate), LiDFOB (lithium difluorooxalatoborate), LiFSI (lithium bis(trifluoromethanesulfonyl imide)) and LiTFSI (lithium bis(trifluoromethanesulfonyl imide)), or two or more thereof; the solvent is one of EC (ethylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate) and PC (propylene carbonate), or two or more thereof, for example, in the liquid electrolyte of an electrode sheet, the lithium salts are LiClO4 and LiBOB, and the solvents are DEC, EMC and PC.

[0067] In one example, the polymer monomer includes at least one of PEGA, PEGMA, EGPEA, MMA, PEGMEM, TEGDA, PEGDA, TPGDA, EGDMA, PEGDMA, HDDA, TEGDMA, BDDA, BEMA, TMPTA, TMPTMA, ETPTA, PETEA, TAEP, FPCA, VC and DOL;

[0068] The initiator includes at least one of AIBN, ABVN, BPO, LPO, TAPP, TBPP and H2O.

[0069] Specifically, the polymer monomers are PEGA (polyethylene glycol methacrylate), PEGMA (polyethylene glycol dimethacrylate), EGPEA (poly 2-phenoxyethyl acrylate), MMA (methyl methacrylate), PEGMEM (polyethylene glycol methyl ether methacrylate), TEGDA (triethylene glycol diacrylate), PEGDA (polyethylene glycol diacrylate), TPGDA (tripropylene glycol diacrylate), EGDMA (ethylene glycol dimethacrylate), PEGDMA (polyethylene glycol dimethacrylate), HDDA (hexanediol diacrylate), TEGDMA (triethylene glycol dimethacrylate), BDDA (butylene glycol diacrylate), BEMA (bisphenol A ethoxylated dimethacrylate), TMPTA (trimethylolpropane triacrylate), T The initiator may be one of MPTMA (trimethylolpropane trimethylene ester), ETPTA (ethoxylated trimethylolpropane triacrylate), PETEA (pentaerythritol tetraacrylate), TAEP (tris(β-azidoethyl) phosphate), FPCA (fluorophosphorus-based crosslinker), VC (vinylene carbonate) and DOL (dioxolane), or two or more thereof, for example, the polymer monomers in the precursor solution are PEGMA and PEGA; the initiator may be one of AIBN (azobisisobutyronitrile), ABVN (azobisisoheptanenitrile), BPO (dibenzoyl peroxide), LPO (phosphonitrile), TAPP (diaminotrihydroxypyridine), TBPP (tri(p-tert-butylphenyl) phosphate) and H2O, or two or more thereof, for example, the initiator in the precursor solution is AIBN and ABVN.

[0070] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to be limiting of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention may be combined with each other without conflict.

[0071] Example 1

[0072] like Figure 1 As shown, this embodiment provides an electrode sheet, including:

[0073] The current collector 100, the composite material layer 200 and the composite material layer 300, the composite material layer 200 and the composite material layer 300 respectively cover the upper and lower surfaces of the current collector 100, the composite material layer 200 and the composite material layer 300 include electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core, the solid electrolyte is separated into a solid electrolyte layer and a solid electrolyte core by the liquid electrolyte layer; the solid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, and the liquid electrolyte layer in the pores is isolated from the electrode particles; a passivation film is generated at the interface between the electrode particles and the solid electrolyte layer through a chemical reaction. The current collector 100 of this embodiment is a metal aluminum foil, and the electrode particles in the composite material layer 200 and the composite material layer 300 include an active material LiFePO4, a conductive agent carbon black, carbon nanotubes and a binder PVDF; the liquid electrolyte in the liquid electrolyte layer is composed of a lithium salt LiPF6 and solvents EC and DEC; the solid electrolyte layer and the solid electrolyte core are products of solidified precursor liquid, the precursor liquid is composed of an initiator AIBN, polymer monomers MMA, PEGDA and a liquid electrolyte, and the liquid electrolyte is composed of a lithium salt LiTFSI and solvents EC and DEC.

[0074] In the local cross-section 210 of the composite material layer 200, there is a channel between the electrode particles 211 and the electrode particles 212, and a solid electrolyte layer 214 is attached to the inner wall of the channel to isolate the liquid electrolyte layer 215 from the electrode particles 211 and the electrode particles 212. The liquid electrolyte layer 215 isolates the solid electrolyte layer 214 from the solid electrolyte core 216. The solid electrolyte layer 214 undergoes an electrochemical reaction with the electrode particles 211 and the electrode particles 212 to generate a passivation film 213.

[0075] This embodiment has carried out a multi-layer design for the microscopic distribution of liquid electrolyte and solid electrolyte in the electrode sheet of the semi-solid battery, that is, inside the pores between the electrode particles, the solid electrolyte is separated into a solid electrolyte layer and a solid electrolyte core by a liquid electrolyte layer; and the solid electrolyte layer is constructed on the inner wall of the pores of the electrode particles, and the electrode particles are separated from the liquid electrolyte by the solid electrolyte layer. The electrode particles of the traditional semi-solid battery are in contact with both the liquid electrolyte and the solid electrolyte; and inside the pores between the electrode particles, the liquid electrolyte and the solid electrolyte are in a disordered mixed state. Compared with the traditional semi-solid battery, the effects of this embodiment are as follows:

[0076] First, compared with liquid electrolytes, the thermal stability of the passivation film formed by polymer solid electrolytes and electrode particles is higher. Therefore, the thermal stability of the passivation film on the surface of the electrode particles of traditional semi-solid batteries is poor. However, this embodiment improves the thermal stability of the passivation film on the surface of the electrode particles, thereby increasing the opening temperature T1 of abnormal heat generation due to thermal runaway of the battery, that is, improving the safety of the battery.

[0077] Second, compared with liquid electrolytes, the high mechanical strength of polymer solid electrolytes can inhibit the growth of lithium dendrites on the surface of negative electrode particles. Therefore, the resistance of traditional semi-solid batteries to lithium dendrites is insufficient. This embodiment improves the resistance of semi-solid batteries to lithium dendrites, inhibits the short circuit caused by lithium dendrites piercing the diaphragm, and alleviates the side reaction between the electrolyte and lithium, thereby increasing the initiation temperature T2 of thermal runaway of the battery, that is, improving the safety of the battery.

[0078] Third, compared with liquid electrolytes, polymer solid electrolytes can form a dense coating on the surface of positive electrode particles. Therefore, the density of the surface coating of the positive electrode particles of traditional semi-solid batteries is insufficient. This embodiment improves the density of the surface coating of the positive electrode particles, inhibits the oxidation heat release of the liquid electrolyte on the surface of the positive electrode particles, and inhibits the release of active oxygen in the positive electrode, thereby increasing the initiation temperature T2 of the thermal runaway of the battery, that is, improving the safety of the battery.

[0079] Fourth, compared with solid electrolytes, lithium ions migrate faster in liquid electrolytes. Therefore, in the electrode pores of traditional semi-solid batteries, the long-range transport of lithium ions between the positive and negative electrodes is hindered by the influence of numerous solid electrolyte particles in the liquid electrolyte. The micro-layered design of solid electrolyte and liquid electrolyte in the electrode pores of this embodiment enables the long-range transport of lithium ions to be carried out in a pure liquid phase, thereby increasing the rate of lithium ion transmission inside the electrode pores, thereby reducing the internal resistance of the semi-solid battery and improving the rate performance and power performance of the semi-solid battery.

[0080] Fifth, lithium ions need to pass through the solid electrolyte layer to migrate from electrode particles to liquid electrolyte, or from liquid electrolyte to electrode particles. The efficiency of lithium ion migration in the solid electrolyte layer is affected by the thickness of the solid electrolyte layer. Therefore, this embodiment separates the solid electrolyte into a solid electrolyte layer and a solid electrolyte core through a liquid electrolyte layer, which reduces the thickness of the solid electrolyte in contact with the electrode particles, reduces the transmission impedance of lithium ions in the solid electrolyte layer, thereby reducing the internal resistance of the semi-solid battery and improving the rate performance and power performance of the semi-solid battery; at the same time, this structure does not reduce the total amount of solid electrolyte, that is, does not increase the amount of liquid electrolyte, thereby ensuring the high safety of the semi-solid battery.

[0081] Example 2

[0082] like Figure 1 As shown, this embodiment provides an electrode sheet, including:

[0083] The current collector 100, the composite material layer 200 and the composite material layer 300, the composite material layer 200 and the composite material layer 300 respectively cover the upper and lower surfaces of the current collector 100, the composite material layer 200 and the composite material layer 300 include electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core, the solid electrolyte is separated into a solid electrolyte layer and a solid electrolyte core by the liquid electrolyte layer; the solid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, isolating the liquid electrolyte layer in the pores from the electrode particles; a passivation film is generated at the interface between the electrode particles and the solid electrolyte layer through a chemical reaction. The current collector 100 of this embodiment is an aluminum alloy foil, and the electrode particles in the composite material layer 200 and the composite material layer 300 include active materials such as LiNi 0.8 Co 0.1 Mn 0.1 O2, conductive agent carbon black, graphene and binder PVDF; the liquid electrolyte in the liquid electrolyte layer is composed of lithium salt LiPF6 and solvents EC, EMC, PC; the solid electrolyte layer and the solid electrolyte core are the products of the solidified precursor liquid, the precursor liquid is composed of initiator ABVN, polymer monomer EGDMA and liquid electrolyte, and the liquid electrolyte is composed of lithium salt LiPF6 and solvents EC, EMC, PC.

[0084] Example 3

[0085] like Figure 1 As shown, this embodiment provides an electrode sheet, including:

[0086] The current collector 100, the composite material layer 200 and the composite material layer 300, the composite material layer 200 and the composite material layer 300 respectively cover the upper and lower surfaces of the current collector 100, the composite material layer 200 and the composite material layer 300 include electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core, the solid electrolyte is separated into a solid electrolyte layer and a solid electrolyte core by the liquid electrolyte layer; the solid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, and the liquid electrolyte layer in the pores is isolated from the electrode particles; a passivation film is generated at the interface between the electrode particles and the solid electrolyte layer through a chemical reaction. The current collector 100 of this embodiment is a metal copper foil, and the electrode particles in the composite material layer 200 and the composite material layer 300 include active material graphite, conductive agent carbon black, graphene and binder CMC, SBR; the liquid electrolyte in the liquid electrolyte layer is composed of lithium salt LiFSI and solvent EC, DMC; the solid electrolyte layer and the solid electrolyte core are the products of the solidified precursor liquid, the precursor liquid is composed of initiator BPO, polymer monomer ETPTA and liquid electrolyte, and the liquid electrolyte is composed of lithium salt LiFSI and solvent EC, DMC.

[0087] Example 4

[0088] like Figure 1 As shown, this embodiment provides an electrode sheet, including:

[0089] The current collector 100, the composite material layer 200 and the composite material layer 300, the composite material layer 200 and the composite material layer 300 respectively cover the upper and lower surfaces of the current collector 100, the composite material layer 200 and the composite material layer 300 include electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core, and the solid electrolyte is separated into a solid electrolyte layer and a solid electrolyte core by the liquid electrolyte layer; the solid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, isolating the liquid electrolyte layer in the pores from the electrode particles; a passivation film is generated at the interface between the electrode particles and the solid electrolyte layer through a chemical reaction. The current collector 100 of this embodiment is a titanium alloy foil, and the electrode particles in the composite material layer 200 and the composite material layer 300 include active material SiO x (0≤x≤2), conductive agent carbon black and binder LiPAA; the liquid electrolyte in the liquid electrolyte layer is composed of lithium salt LiPF6 and solvents EC, EMC, PC; the solid electrolyte layer is the product of the solidification of the precursor liquid, the precursor liquid is composed of initiator ABVN, polymer monomer EGDMA and liquid electrolyte, the liquid electrolyte is composed of lithium salt LiPF6 and solvents EC, EMC, PC; the solid electrolyte core is the product of the solidification of the precursor liquid, the precursor liquid is composed of initiator ABVN, polymer monomer PETEA and liquid electrolyte, the liquid electrolyte is composed of lithium salt LiPF6 and solvents EC, EMC, PC.

[0090] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An electrode sheet, characterized in that: include: a first composite material layer, a current collector, and a second composite material layer; The first composite material layer and the second composite material layer are respectively covered on the upper surface and the lower surface of the current collector; The first composite material layer and the second composite material layer include: Electrode particles, a solid electrolyte layer, a liquid electrolyte layer and a solid electrolyte core; The solid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, isolating the liquid electrolyte layer in the pores from the electrode particles; The liquid electrolyte layer is disposed between the solid electrolyte layer and the solid electrolyte core to isolate the solid electrolyte layer from the solid electrolyte core.

2. The electrode sheet according to claim 1, characterized in that: The electrode particles include an active material, a conductive agent and a binder.

3. The electrode sheet according to claim 1, characterized in that: The current collector is a metal or an alloy; The metal includes at least one of aluminum, copper, nickel and titanium; The alloy includes at least one of aluminum alloy, copper alloy, nickel alloy and titanium alloy.

4. The electrode sheet according to claim 1, characterized in that: The solid electrolyte is a product obtained by solidifying the precursor solution; The precursor solution includes an initiator, a polymer monomer and a liquid electrolyte.

5. The electrode sheet according to claim 2, characterized in that: The active material includes at least LiFePO4, LiNi x Co y Mn (1-x-y) O2, LiMn2O4, graphite and SiO x One of the following; Among them, LiNi x Co y Mn (1-x-y) In O2, 0≤x+y≤1, SiO x Where 0≤x≤2.

6. The electrode sheet according to claim 2, characterized in that: The conductive agent includes at least one of carbon black, carbon nanotubes and graphene.

7. The electrode sheet according to claim 2, characterized in that: The binder includes at least one of PVDF, CMC, SBR, PAA and LiPAA.

8. The electrode sheet according to claim 4, characterized in that: The liquid electrolyte includes a lithium salt and a solvent; The lithium salt includes at least one of LiPF6, LiBF4, LiClO4, LiBOB, LiDFOB, LiFSI and LiTFSI; The solvent includes at least one of EC, DMC, DEC, EMC and PC.

9. The electrode sheet according to claim 4, characterized in that: The polymer monomer includes at least one of PEGA, PEGMA, EGPEA, MMA, PEGMEM, TEGDA, PEGDA, TPGDA, EGDMA, PEGDMA, HDDA, TEGDMA, BDDA, BEMA, TMPTA, TMPTMA, ETPTA, PETEA, TAEP, FPCA, VC and DOL; The initiator includes at least one of AIBN, ABVN, BPO, LPO, TAPP, TBPP and H2O.

10. A battery, characterized in that: The battery comprises the electrode sheet according to any one of claims 1 to 9.