Electrode plate and battery

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 liquid electrolyte layer and a solid electrolyte; the liquid electrolyte layer is attached to the inner wall of a pore channel formed among the electrode particles to isolate the solid electrolyte in the pore channel from the electrode particles; a plurality of liquid electrolyte channels connected to the liquid electrolyte layer are arranged in the solid electrolyte, and the liquid electrolyte channels are used for storing the liquid electrolyte to supplement the liquid electrolyte of the liquid electrolyte layer. The microcosmic distribution of the liquid electrolyte and the solid electrolyte of the semi-solid battery is ordered, so that the internal resistance of the semi-solid battery is reduced, and the rate performance, the power performance and the cycle performance of the semi-solid battery are improved.

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, thereby improving the safety of the battery. However, the electrode particles of traditional semi-solid batteries are in contact with both liquid electrolytes and solid electrolytes; and in the pores between the electrode particles, the liquid electrolyte and the solid electrolyte are in a disordered mixed state. Compared with liquid electrolytes, the migration rate of lithium ions in polymer solid electrolytes is significantly reduced, and the interface migration resistance at the contact point between the electrode particles and the solid electrolyte is large, both of which cause the internal resistance of the battery to increase, that is, the rate performance and power performance of the battery to decrease. In addition, when lithium-ion batteries are charged for the first time, the electrolyte will generate a passivation film on the surface of the electrode particles through electrochemical reactions. During the subsequent charging process, the electrochemical reaction will continue to proceed slowly, resulting in the gradual consumption of the electrolyte. In traditional semi-solid batteries, this phenomenon causes the contact between the electrode particles and the liquid electrolyte to gradually deteriorate, resulting in a continuous increase in the interface migration resistance of lithium ions, which in turn causes the capacity of the battery to gradually decrease with cyclic charge and discharge, that is, the cycle performance of the battery decreases. Therefore, a technical solution is needed to simultaneously improve the rate performance, power performance and cycle performance of semi-solid-state 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 rate performance, power performance and cycle performance of the semi-solid-state battery while maintaining the high safety of the semi-solid-state 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, liquid electrolyte layers, and solid electrolytes;

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

[0013] A plurality of liquid electrolyte channels connected to the liquid electrolyte layer are arranged inside the solid electrolyte, and the liquid electrolyte channels are used to store liquid electrolyte to supplement the liquid electrolyte of the liquid electrolyte layer.

[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 orderly designs the microscopic distribution of the liquid electrolyte and the solid electrolyte in the electrode sheet of the semi-solid battery, that is, by constructing a liquid electrolyte layer on the inner wall of the pores between the electrode particles, the electrode particles are separated from the solid electrolyte, and a liquid electrolyte channel is constructed in the solid electrolyte to connect the liquid electrolyte channel with the liquid electrolyte layer, without reducing the proportion of the solid electrolyte in the semi-solid battery, that is, without increasing the content of the liquid electrolyte, so that the high safety of the semi-solid battery can be maintained; in the electrode sheet, the interface migration of lithium ions is between the electrode particles and the pure liquid electrolyte. The long-range transport of lithium ions between the positive and negative electrodes takes place in a pure liquid phase, which is beneficial to increasing the bulk transfer rate of lithium ions inside the electrolyte, 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, the liquid electrolyte consumed by the electrochemical reaction with the electrode particles in the liquid electrolyte layer is replenished through the liquid electrolyte channel, thereby maintaining long-term good contact between the electrode particles and the liquid electrolyte, avoiding the increase of lithium ion interface migration resistance with the battery cycle charge and discharge, and improving the cycle performance 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. Liquid electrolyte layer, 215. Liquid electrolyte channel, 216. Solid electrolyte. 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, liquid electrolyte layers, and solid electrolytes;

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

[0043] A plurality of liquid electrolyte channels connected to the liquid electrolyte layer are arranged inside the solid electrolyte, and the liquid electrolyte channels are used to store liquid electrolyte to replenish the liquid electrolyte of the liquid electrolyte layer.

[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 respectively cover 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 liquid electrolyte layer and a solid electrolyte, and a pore is formed between the electrode particles, and the liquid electrolyte layer is arranged on the inner wall of the pore, thereby isolating the solid 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 pores between the electrode particles, the liquid electrolyte and the solid electrolyte are in a disordered mixed state. The present invention isolates the solid electrolyte from the electrode particles by arranging a liquid electrolyte layer on the inner wall of the pore, and orderly distributes the liquid electrolyte and the solid electrolyte, while not reducing the proportion of the solid electrolyte in the semi-solid battery, that is, not increasing the content of the liquid electrolyte, and can maintain the high safety of the semi-solid battery. The electrode particles in the electrode sheet of a traditional semi-solid battery are in contact with both the liquid electrolyte and the solid electrolyte, resulting in a large interfacial migration resistance of lithium ions. The present invention distributes the liquid electrolyte and the solid electrolyte in an orderly manner, so that the interfacial migration of lithium ions can be carried out between the electrode particles and the pure liquid electrolyte, and the long-range transport of lithium ions between the positive and negative electrodes can be carried out in the pure liquid phase, thereby reducing the interfacial migration resistance of lithium ions and increasing the bulk phase transmission rate of lithium ions inside the electrolyte, which is beneficial to reducing the internal resistance of the semi-solid battery and improving the rate performance and power performance of the semi-solid battery. A plurality of liquid electrolyte channels for storing liquid electrolytes are arranged inside the solid electrolyte and are connected to the liquid electrolyte layer, and the liquid electrolyte in the liquid electrolyte channel is the same as the liquid electrolyte in the liquid electrolyte layer. When a lithium-ion battery is charged for the first time, the electrolyte will generate a passivation film on the surface of the electrode particles through an electrochemical reaction, and in the subsequent charging process, the electrochemical reaction will continue to proceed slowly, resulting in the gradual consumption of the electrolyte. In traditional semi-solid batteries, this phenomenon causes the contact between the electrode particles and the liquid electrolyte to gradually deteriorate, thereby causing the interface migration resistance of lithium ions to continue to increase, and then causing the capacity of the battery to gradually decrease with cyclic charge and discharge, that is, causing the battery's cycle performance to decrease. The present invention replenishes the liquid electrolyte consumed in the liquid electrolyte layer due to the electrochemical reaction with the electrode particles through the liquid electrolyte stored in the liquid electrolyte channel, thereby maintaining a long-term good contact between the electrode particles and the liquid electrolyte, that is, avoiding the increase of the lithium ion interface migration resistance with the battery's cyclic charge and discharge, and thus improving the cycle performance of the semi-solid battery.

[0045] In one example, the electrode particles include an active material, a conductive agent, and a binder.

[0046] 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.

[0047] In one example, the current collector is a metal or an alloy;

[0048] The metal includes at least one of aluminum, copper, nickel and titanium;

[0049] The alloy includes at least one of an aluminum alloy, a copper alloy, a nickel alloy and a titanium alloy.

[0050] 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.

[0051] In one example, the solid electrolyte is a product of solidification of a precursor solution;

[0052] The precursor solution includes an initiator, a polymer monomer and a liquid electrolyte.

[0053] 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.

[0054] 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;

[0055] Among them, LiNi x Co y Mn (1-x-y) In O2, 0≤x+y≤1, SiO x Where 0≤x≤2.

[0056] 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.

[0057] In one example, the conductive agent includes at least one of carbon black, carbon nanotubes, and graphene.

[0058] 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.

[0059] In one example, the binder includes at least one of PVDF, CMC, SBR, PAA, and LiPAA.

[0060] 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.

[0061] In one example, the liquid electrolyte includes a lithium salt and a solvent;

[0062] The lithium salt includes at least one of LiPF6, LiBF4, LiClO4, LiBOB, LiDFOB, LiFSI and LiTFSI;

[0063] The solvent includes at least one of EC, DMC, DEC, EMC and PC.

[0064] 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.

[0065] 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;

[0066] The initiator includes at least one of AIBN, ABVN, BPO, LPO, TAPP, TBPP and H2O.

[0067] 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.

[0068] 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.

[0069] Example 1

[0070] like Figure 1 As shown, this embodiment provides an electrode sheet, including:

[0071] 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 liquid electrolyte layer and a solid electrolyte, the liquid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, and the solid electrolyte in the pores is isolated from the electrode particles; a passivation film is generated at the interface between the electrode particles and the liquid electrolyte layer through a chemical reaction, and a plurality of liquid electrolyte channels connected to the liquid electrolyte layer are provided inside the solid electrolyte, and the liquid electrolyte channels are used to store liquid electrolyte to replenish the liquid electrolyte of the liquid electrolyte layer. The current collector 100 of this embodiment is a metal aluminum foil, the electrode particles in the composite material layer 200 and the composite material layer 300 are composed of an active material LiFePO4, a conductive agent carbon black and a binder PVDF; the liquid electrolyte in the liquid electrolyte layer and the liquid electrolyte channel is composed of a lithium salt LiPF6 and a solvent EC, EMC, DEC; the solid electrolyte is a product of solidified precursor liquid, and the precursor liquid is composed of an initiator ABVN, a polymer monomer TEGDA and a liquid electrolyte; the liquid electrolyte is composed of a lithium salt LiPF6 and a solvent EC, EMC, DEC.

[0072] 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 liquid electrolyte layer 214 is attached to the inner wall of the channel to isolate the solid electrolyte 216 from the electrode particles 211 and the electrode particles 212. The solid electrolyte 216 is provided with a plurality of liquid electrolyte channels 215 connected to the liquid electrolyte layer 214. When a passivation film 213 is generated at the interface between the electrode particles 211 and the electrode particles 212 and the liquid electrolyte layer 214 due to an electrochemical reaction, the liquid electrolyte is replenished to the liquid electrolyte layer 214 through the liquid electrolyte channels 215.

[0073] This embodiment has carried out an orderly design for the microscopic distribution of liquid electrolyte and solid electrolyte in the electrode sheet of the semi-solid battery, that is, by constructing a liquid electrolyte layer on the inner wall of the pores between the electrode particles to separate the electrode particles from the solid electrolyte; and constructing a liquid electrolyte channel in the solid electrolyte to connect the liquid electrolyte channel with the liquid 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. The redesign of the microscopic distribution of liquid electrolyte and solid electrolyte in the electrode sheet in this embodiment does not reduce the proportion of solid electrolyte in the semi-solid battery, that is, it does not increase the content of liquid electrolyte, so the high safety of the semi-solid battery can be maintained. Furthermore, compared with the traditional semi-solid battery, the advantages of this embodiment are as follows:

[0074] First, compared with solid electrolytes, the interfacial migration resistance of lithium ions between liquid electrolytes and electrode particles is smaller. The electrode particles of traditional semi-solid batteries are in contact with both liquid electrolytes and solid electrolytes, resulting in a large interfacial migration resistance of lithium ions. However, the ordered distribution of solid electrolytes and liquid electrolytes in the electrode pores of this embodiment can enable the interfacial migration of lithium ions to take place between electrode particles and pure liquid electrolytes, thereby significantly reducing the interfacial migration resistance of lithium ions, which is beneficial to reducing the internal resistance of semi-solid batteries, that is, improving the rate performance and power performance of semi-solid batteries.

[0075] Second, compared with solid electrolytes, the migration rate of lithium ions in liquid electrolytes is faster. 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. However, the ordered distribution of solid electrolytes and liquid electrolytes in the electrode pores of this embodiment can enable the long-range transport of lithium ions between the positive and negative electrodes to be carried out in a pure liquid phase, which is conducive to improving the bulk phase transmission rate of lithium ions in the electrolyte, thereby reducing the internal resistance of the semi-solid battery and improving the rate performance and power performance of the semi-solid battery.

[0076] Third, when the lithium-ion battery is charged for the first time, the electrolyte will generate a passivation film on the surface of the electrode particles through an electrochemical reaction. During the subsequent charging process, the electrochemical reaction will continue to proceed slowly, resulting in the gradual consumption of the electrolyte. In traditional semi-solid batteries, this phenomenon causes the contact between the electrode particles and the liquid electrolyte to gradually deteriorate, resulting in a continuous increase in the interfacial migration resistance of lithium ions, which in turn causes the capacity of the battery to gradually decrease with cyclic charge and discharge, that is, the cycle performance of the battery decreases. The ordered distribution of the solid electrolyte and the liquid electrolyte in the electrode pores of this embodiment can replenish the liquid electrolyte consumed in the liquid electrolyte layer through the liquid electrolyte channel, thereby maintaining long-term good contact between the electrode particles and the liquid electrolyte, that is, avoiding the increase of the interfacial migration resistance of lithium ions with the cyclic charge and discharge of the battery, thereby improving the cycle performance of the semi-solid battery.

[0077] Example 2

[0078] like Figure 1 As shown, this embodiment provides an electrode sheet, including:

[0079] 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 liquid electrolyte layer and a solid electrolyte, the liquid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, and the solid electrolyte in the pores is isolated from the electrode particles; a passivation film is generated by chemical reaction at the interface between the electrode particles and the liquid electrolyte layer, and a plurality of liquid electrolyte channels connected to the liquid electrolyte layer are provided inside the solid electrolyte, and the liquid electrolyte channels are used to store liquid electrolyte to replenish the liquid electrolyte in the liquid electrolyte layer. 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 are composed of the active material LiNi 0.5 Co 0.3 Mn 0.2 O2, conductive agent carbon black, graphene and binder PVDF; the liquid electrolyte in the liquid electrolyte layer and the liquid electrolyte channel is composed of lithium salt LiFSI and solvent EC, EMC; the solid electrolyte is the product of the solidification of the precursor liquid, and the precursor liquid is composed of initiator AIBN, polymer monomer EGPEA and liquid electrolyte; the liquid electrolyte is composed of lithium salt LiFSI and solvent EC, EMC.

[0080] Example 3

[0081] like Figure 1 As shown, this embodiment provides an electrode sheet, including:

[0082] 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 liquid electrolyte layer and a solid electrolyte, the liquid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, and the solid electrolyte in the pores is isolated from the electrode particles; a passivation film is generated at the interface between the electrode particles and the liquid electrolyte layer through a chemical reaction, and a plurality of liquid electrolyte channels connected to the liquid electrolyte layer are provided inside the solid electrolyte, and the liquid electrolyte channels are used to store liquid electrolyte to replenish the liquid electrolyte of the liquid electrolyte layer. 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 are composed of active material graphite, conductive agent carbon black, carbon nanotubes and binder CMC, SBR; the liquid electrolyte in the liquid electrolyte layer and the liquid electrolyte channel is composed of lithium salt LiTFSI and solvent EC, DMC, DEC; the solid electrolyte is the product of the solidified precursor liquid, the precursor liquid is composed of initiator LPO, polymer monomer TMPTA and liquid electrolyte, and the liquid electrolyte in the precursor liquid is composed of lithium salt LiBOB and solvent EC, DMC, EMC.

[0083] Example 4

[0084] like Figure 1 As shown, this embodiment provides an electrode sheet, including:

[0085] 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 liquid electrolyte layer and a solid electrolyte, the liquid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, and the solid electrolyte in the pores is isolated from the electrode particles; a passivation film is generated by chemical reaction at the interface between the electrode particles and the liquid electrolyte layer, and a plurality of liquid electrolyte channels connected to the liquid electrolyte layer are provided inside the solid electrolyte, and the liquid electrolyte channels are used to store liquid electrolyte to supplement the liquid electrolyte of the liquid electrolyte layer. The current collector 100 of this embodiment is a nickel alloy foil, and the electrode particles in the composite material layer 200 and the composite material layer 300 are composed of active material SiO x (0≤x≤2), conductive agent carbon black, graphene and binder LiPAA are composed; the liquid electrolyte layer and the liquid electrolyte in the liquid electrolyte channel are composed of lithium salt LiBOB and solvents EC, DMC, EMC; the solid electrolyte is the product of the solidified precursor liquid, the precursor liquid is composed of initiator TBPP, polymer monomer TAEP and liquid electrolyte, and the liquid electrolyte in the precursor liquid is composed of lithium salt LiTFSI and solvents EC, DMC, DEC.

[0086] 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, liquid electrolyte layers, and solid electrolytes; The liquid electrolyte layer is attached to the inner wall of the pores formed between the electrode particles, isolating the solid electrolyte in the pores from the electrode particles; A plurality of liquid electrolyte channels connected to the liquid electrolyte layer are arranged inside the solid electrolyte, and the liquid electrolyte channels are used to store liquid electrolyte to supplement the liquid electrolyte of the liquid electrolyte layer.

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.

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