Positive pole piece, preparation method thereof and solid-state battery

Abstract

The invention relates to the technical field of battery preparation processes, in particular to a positive pole piece, a preparation method thereof and a solid-state battery. The preparation method of the positive pole piece comprises the following steps: providing foamed nickel and a halide electrolyte precursor solution; the foamed nickel is placed in the halide electrolyte precursor solution for heat treatment, halide solid electrolyte is generated on the surface of the foamed nickel, and then the foamed nickel is taken out and dried; and mixing the dried foamed nickel with the mixed powder containing the positive active material and the binder, and then carrying out hot pressing treatment to obtain the positive pole piece. The preparation method disclosed by the invention is simple in process, and the positive pole piece with high active substance content and conductivity can be obtained and can be used in a solid-state battery to well improve the charge-discharge performance of the battery.

Description

Technical Field

[0001] This application belongs to the technical field of battery preparation processes, and particularly relates to a positive electrode sheet, a preparation method thereof, and a solid-state battery. Background Art

[0002] With the booming development of new energy vehicles, the battery drive system has become an important factor affecting the performance and cost of new energy vehicles, and lithium-ion batteries have become the preferred power source in the battery drive system.

[0003] As a type of lithium-ion battery, solid-state batteries have characteristics such as high energy density and good safety. During the manufacturing process of the positive electrode sheet of a solid-state battery monomer, the energy density can be increased by increasing the thickness of the electrode sheet. However, the thick electrode has poor electrical conductivity, which affects the charge and discharge performance of the battery. Summary of the Invention

[0004] The purpose of this application is to provide a positive electrode sheet, a preparation method thereof, and a solid-state battery, aiming to solve the technical problem of how to make the positive electrode of the battery take into account both a high content of active substances and electrical conductivity.

[0005] To achieve the above application purpose, the technical solution adopted in this application is as follows:

[0006] In the first aspect, this application provides a preparation method for a positive electrode sheet, including:

[0007] Providing nickel foam and a halide electrolyte precursor solution;

[0008] Placing the nickel foam in the halide electrolyte precursor solution for heat treatment to form a halide solid electrolyte on the surface of the nickel foam, and then taking out the nickel foam for drying treatment;

[0009] Mixing the dried nickel foam with a mixed powder containing a positive electrode active material and a binder, and then performing hot pressing treatment to obtain a positive electrode sheet.

[0010] In some embodiments, the halide electrolyte precursor solution contains LiX, as well as MX3 and / or NX3, and the formed halide solid electrolyte is Li3N 1-a M a X6; where X is a halogen element, and M and N are each at least one of indium, scandium, yttrium, erbium, and zirconium, and 0 ≤ a ≤ 1.

[0011] In some embodiments, the temperature of the heat treatment is 120 - 550 °C, and the time is 3 - 5 h.

[0012] In some embodiments, the temperature of the hot pressing treatment is 100 - 250 °C, and the pressure is 1 - 20 MP.

[0013] In some embodiments, the mass ratio of the halide solid electrolyte, the positive electrode active material, and the binder is (0.5 - 3):(93 - 98):(1 - 4).

[0014] In some embodiments, the positive electrode active material includes at least one of lithium-containing phosphates and lithium transition metal oxides;

[0015] and / or, the binder includes at least one of polyvinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, hydrogenated nitrile rubber, and styrene-butadiene rubber.

[0016] In some embodiments, the thickness of the nickel foam is 3 - 5 mm.

[0017] In a second aspect, the present application provides a positive electrode sheet, which is prepared by the preparation method provided in the first aspect of the present application.

[0018] In some embodiments, the thickness of the positive electrode sheet is 0.15 - 1 mm.

[0019] In a third aspect, the present application provides a solid-state battery, including a positive electrode and a negative electrode arranged opposite to each other, wherein the positive electrode includes the positive electrode sheet provided in the second aspect of the present application.

[0020] In the preparation method of the positive electrode sheet provided in the first aspect of the present application, nickel foam with a three-dimensional electronic conductive structure is used as the positive electrode current collector, and a halide solid electrolyte is in-situ synthesized on its surface as an ion conductive material, so that the nickel foam has a three-dimensional electronic conductive and ion conductive network. Subsequently, it is mixed and hot-pressed with the positive electrode active material and the binder by a dry process, so that the mixture powder is embedded in the nickel foam and compacted to form a thick positive electrode sheet. Such a preparation method is not only simple in process, but also can obtain a positive electrode sheet with a high active material content and good conductive performance, which can well improve the charge and discharge performance of the battery when used in a solid-state battery.

[0021] The positive electrode sheet provided in the second aspect of the present application is prepared by the preparation method provided in the first aspect of the present application. Such a positive electrode sheet has the characteristics of both a high active material content and good conductive performance, and can well improve the charge and discharge performance of the battery when used in a solid-state battery.

[0022] The positive electrode of the solid-state battery provided in the third aspect of the present application includes the positive electrode sheet provided in the second aspect of the present application. Based on the characteristics of both a high active material content and good conductive performance of this positive electrode sheet, the solid-state battery of the present application has good charge and discharge performance. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a flowchart for preparing a positive electrode plate provided by an embodiment of the present application.

[0025] Among them, each reference numeral in the figure:

[0026] ①: Carrier coil; ②: Empty carrier; ③: Material tank; ④: Pressure roller; ⑤: Compacted carrier; ⑥: Process roller. Specific embodiments

[0027] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer and more understandable, the following further details the present application 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.

[0028] In the present application, the term "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0029] In the present application, "at least one" means one or more, and "a plurality" means two or more. "At least one of the following (items)" or its similar expressions refer to any combination of these items, including any combination of single (item) or plural items (items).

[0030] It should be understood that in various embodiments of the present application, the magnitudes of the serial numbers of the above processes do not mean the sequence of execution. Some or all of the steps can be executed in parallel or successively. The execution sequence of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0031] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0032] In the description of the embodiments of the present application, the weights of the relevant components mentioned not only can refer to the specific contents of each component, but also can represent the proportional relationship of the weights between each component. Therefore, as long as the contents of the relevant components in the description of the embodiments of the present application are scaled up or down proportionally, they are within the scope disclosed in the description of the embodiments of the present application. Specifically, the mass described in the description of the embodiments of the present application can be mass units well-known in the chemical industry such as μg, mg, g, kg, etc.

[0033] The terms "first" and "second" are only used for descriptive purposes, to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of such features.

[0034] For the dry electrode of the solid-state battery, the binder fibrillation method is mainly adopted and rolled and compounded onto the current collector. Among them, a conductive agent (such as carbon nanotubes), a solid-state electrolyte, and a cathode active material can be further pressed into a film on the surface of the current collector (such as aluminum foil). However, in this process, it is difficult for the conductive agent and the solid-state electrolyte to form a uniformly dispersed network, resulting in low conductivity, and secondary rolling is required.

[0035] Based on this, in the embodiments of the present application, nickel foam with a three-dimensional electronic conductive structure is used as the positive electrode current collector, and a halide solid electrolyte is in-situ synthesized on its surface as an ion conductive material, so that the nickel foam has a three-dimensional electronic conductive and ion conductive network. Then, through a dry process, it is mixed and hot-pressed with a cathode active material and a binder, so that the mixture powder is embedded in the nickel foam and compacted to form a thick positive electrode plate. Such a preparation method is not only simple in process, but also a positive electrode plate with a high active material content and conductivity can be obtained without adding a conductive agent. The prepared positive electrode plate can be well used in a solid-state battery to improve the charge and discharge performance of the battery. The specific technical solution is as follows.

[0036] The first aspect of the embodiments of the present application provides a method for preparing a positive electrode plate. The preparation method of the embodiments of the present application includes the following steps:

[0037] S01: Provide nickel foam and a halide electrolyte precursor solution;

[0038] S02: Place the nickel foam in the halide electrolyte precursor solution for heat treatment to generate a halide solid electrolyte on the surface of the nickel foam, and then take out the nickel foam for drying treatment;

[0039] S03: Mix the dried nickel foam with the mixed powder containing the positive electrode active material and the binder, and then obtain the positive electrode plate through hot pressing.

[0040] The nickel foam has a three-dimensional electronic conductive structure. Surface treatment is performed on the nickel foam, that is, the nickel foam is placed in a halide electrolyte precursor solution for heating reaction, and a halide solid electrolyte is pre-deposited on the surface of the nickel foam, which has good ionic conductivity. The treated nickel foam has a three-dimensional electronic and ionic conductive network. Then, the mixed powder of the positive electrode active material and the binder is mixed and hot pressed with the nickel foam, and is embedded in the voids of the nickel foam and combined on the surface to form a dry electrode, and a positive electrode plate with a high active material content and conductive performance can be obtained, which can well improve its rate performance when used in a solid-state battery.

[0041] In some embodiments, the thickness of the nickel foam is 3 - 5 mm. The positive electrode plate obtained through hot pressing can be 0.15 - 1 mm.

[0042] In some embodiments, the halide electrolyte precursor solution contains LiX, as well as MX3 and / or NX3, and the generated halide solid electrolyte is Li3N 1-a M a X6; wherein, X is a halogen element, and M and N are respectively at least one of indium (In), scandium (Sc), yttrium (Y), erbium (Er), and zirconium (Zr), 0 ≤ a ≤ 1. Specifically, when a = 0, the halide electrolyte precursor solution contains LiX and NX3, and the generated halide solid electrolyte is Li3NX6; when a = 1, the halide electrolyte precursor solution contains LiX and MX3, and the generated halide solid electrolyte is Li3MX6; when 0 < a < 1, the generated halide solid electrolyte is Li3N 1-a M a X6; wherein, X is a halogen element, such as chlorine, bromine, iodine, etc. The halide solid electrolyte not only has good conductivity, but also has a stable electrochemical window and can be compatible with high-voltage positive electrode active materials such as ternary materials.

[0043] In some embodiments, the halide solid electrolyte is Li3InCl6, which has good ionic conductivity of 1.1 - 1.7 (>10 -3 , with the unit of S / cm), and the nickel foam after surface treatment can be further dried in vacuum.

[0044] In some embodiments, the solvent in the halide electrolyte precursor solution is an aqueous solvent. Specifically, taking the halide electrolyte precursor solution containing LiX and MX3 as an example, LiX and MX3 can be dissolved in water to obtain it. Among them, during the heat treatment process, LiX and MX3 react through heating to form the solid electrolyte Li3MX6, and then the water is dried to obtain the surface-pretreated nickel foam.

[0045] Specifically, the process is as follows:

[0046] 3LiX + MX3 --- Li3MX6·aH2O --- Li3MX6 (solid state), and the reaction product is deposited on the surface of nickel foam.

[0047] In some embodiments, during the above reaction process, the heat treatment temperature is 120 - 550 °C and the time is 3 - 5 h. Specifically, when M and N in the halide electrolyte precursor solution do not contain yttrium, the heat treatment temperature can be 120 - 220 °C; when M or N contains yttrium, the heat treatment temperature can be 350 - 550 °C. Under this condition, the formation and deposition of the halide solid electrolyte can be fully carried out.

[0048] After taking out the surface-treated nickel foam and drying to remove moisture, it is then mixed with a mixed powder containing a positive electrode active material and a binder, and then hot-pressed to obtain a positive electrode plate.

[0049] In some embodiments, the hot-pressing treatment temperature is 100 - 250 °C and the pressure is 1 - 20 MP. Under this condition, the voids in the nickel foam can be fully filled with the mixed powder and pressed to form a positive electrode plate with the required thickness. Among them, hot-pressing can be achieved by a heating and rolling equipment.

[0050] In some embodiments, the mass ratio of the halide solid electrolyte, the positive electrode active material, and the binder is (0.5 - 3):(93 - 98):(1 - 4). The positive electrode plate formed within this mass ratio range not only has stable material combination, high content of the positive electrode active material, but also good conductivity. Among them, the mass ratio of the halide solid electrolyte to the positive electrode active material can be (0.5 - 3):(93 - 98), and the mass ratio of the positive electrode active material to the binder can be (93 - 98):(1 - 4).

[0051] In some embodiments, the positive electrode active substance includes at least one of lithium-containing phosphates and lithium transition metal oxides. These positive electrode active materials can be used alone or in combination of two or more. Among them, the lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3Co 1 / 3 Mn 1 / 3 O2, abbreviated as NCM333; LiNi 0.5 Co 0.2 Mn 0.3 O2, abbreviated as NCM523; LiNi 0.5Co 0.25 Mn 0.25 O2, abbreviated as NCM211; LiNi 0.6 Co 0.2 Mn 0.2 O2, abbreviated as NCM622; LiNi 0.8 Co 0.1 Mn 0.1 O2, abbreviated as NCM811), etc. At least one of them. The lithium-containing phosphate with olivine structure includes but is not limited to lithium iron phosphate (such as LiFePO4), the composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), the composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, the composite material of lithium manganese iron phosphate and carbon.

[0052] In some embodiments, the binder includes at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber.

[0053] Such as Figure 1 As shown, it is a schematic diagram of a preparation process of the positive electrode sheet in an embodiment of the present application. Specifically, first, a halide solid electrolyte is formed on the surface of nickel foam, and it is used as a reticular carrier web to unwind. The thickness of the empty carrier after unwinding is about 3-5 mm. It passes through a material tank. The positive electrode active material powder and the binder powder are uniformly mixed, and the mixed powder is placed in the material tank in advance. In this way, the empty carrier passes through the material tank from bottom to top at a speed of 2-5 meters per minute, carrying the mixed powder of the positive electrode active material and the binder. The mixed powder naturally gathers downward due to gravity and adheres to the carrier. Then it passes through a pressure roller with an attached heating function for rolling. The thickness of the compacted carrier after rolling is about 0.15-1 mm, which is the positive electrode sheet, and then it is collected through a process roller.

[0054] In the second aspect, the present application provides a positive electrode sheet. The positive electrode sheet in the embodiment of the present application is prepared by the preparation method provided in the first aspect of the embodiment of the present application.

[0055] Among them, the positive electrode sheet includes nickel foam, the pores of nickel foam and a sulfide solid electrolyte are formed on the surface, and the positive electrode active material and the binder are pressed thereon. The positive electrode sheet in the embodiment of the present application has the characteristics of both high active material content and conductive performance, and can well improve the charge and discharge performance of the battery when used in a solid-state battery.

[0056] In some embodiments, the halide solid electrolyte in the positive electrode sheet is Li3N 1-a M aX6; wherein X is a halogen element, M and N are each independently at least one of indium, scandium, yttrium, erbium, and zirconium, and 0 ≤ a ≤ 1. The positive electrode active material includes at least one of a lithium-containing phosphate and a lithium transition metal oxide. The binder includes at least one of polyvinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, hydrogenated nitrile rubber, and styrene-butadiene rubber. Further, the mass ratio of the halide solid electrolyte, the positive electrode active material, and the binder is (0.5-3):(93-98):(1-4). The high active material content mentioned in the embodiments of the present application means that the proportion of the positive electrode active material in the positive electrode sheet is high.

[0057] In some embodiments, the thickness of the positive electrode sheet is 0.15-1 mm.

[0058] In a third aspect, the present application provides a solid-state battery. The solid-state battery according to the embodiments of the present application includes a positive electrode and a negative electrode disposed opposite to each other, and the positive electrode includes the positive electrode sheet provided in the second aspect of the embodiments of the present application.

[0059] The positive electrode of the solid-state battery according to the embodiments of the present application includes the positive electrode sheet provided in the second aspect of the present application. Based on the characteristics of the positive electrode sheet having both a high active material content and good conductivity, the solid-state battery of the present application has a high energy density, good rate performance, and excellent charge and discharge performance.

[0060] In some embodiments, the negative electrode used may be only a metal sheet as the negative electrode current collector, that is, the corresponding solid-state battery monomer is a solid-state metal battery without a negative electrode active material such as carbon silicon. Alternatively, the negative electrode sheet includes a negative electrode current collector and a negative electrode active layer provided on at least one surface of the negative electrode current collector. As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector. The negative electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0061] In some embodiments, the negative electrode active material in the negative electrode active layer may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The negative electrode active layer may also optionally include a binder. The binder may be selected from at least one of styrene-butadiene rubber, polyacrylic acid, sodium polyacrylate, polyacrylamide, polyvinyl alcohol, sodium alginate, polymethacrylic acid, and carboxymethyl chitosan. The negative electrode active layer may also optionally include a conductive agent. The conductive agent may be selected from at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0062] In some embodiments, the negative electrode active layer may also optionally include other additives, such as a dispersant, a thickening agent (such as sodium carboxymethyl cellulose), etc.

[0063] Specifically, the solid-state battery provided by the embodiments of the present application includes: (1) a positive electrode; (2) a negative electrode; (3) a solid electrolyte layer located between the positive electrode and the negative electrode. The positive electrode is the positive electrode sheet provided by the second aspect of the embodiments of the present application. The electrolyte in the solid electrolyte layer and the halide solid electrolyte in the positive electrode sheet may be the same or different. For example, the same halide electrolyte is used. Specifically, the above positive electrode, solid electrolyte layer, and electrode sheet can be assembled by a lamination or winding process to obtain a solid-state battery monomer.

[0064] The following is described in conjunction with specific embodiments.

[0065] Example 1

[0066] A solid-state battery has the following composition and preparation method.

[0067] (1) Positive electrode sheet

[0068] Soak a foam nickel with a thickness of 3 mm in a halide electrolyte precursor solution (prepared according to the ratio of dissolving 0.3 mol of LiCl and 0.1 mol of InCl3 in every 1 of water), and heat-treat it at 200 °C for 4 h. Then take out the foam nickel and dry it in vacuum, and Li3InCl6 is formed on the surface of the foam nickel.

[0069] Uniformly mix the positive electrode active material powder NCM811 and the binder powder PTFE, and place them in a trough. Pass the long roll of the above-treated foam nickel through the trough from bottom to top at a constant speed of 2 m / min, so that the mixed powder enters the internal space of the foam nickel, and then pass through a pressure roller with an additional heating function for rolling (temperature is 200 °C, pressure is 10 MP). After rolling, die-cut to obtain a positive electrode sheet with a thickness of 0.3 mm. Among them, in the unit area of the positive electrode sheet, the mass ratio of Li3InCl6, NCM811, and PTFE is about 2:95:3.

[0070] (2) Electrolyte sheet

[0071] Press the pure Li3InCl6 powder into a tablet to make a circular sheet with a thickness of 150 microns as the electrolyte diaphragm for subsequent battery assembly.

[0072] (3) Negative electrode plate

[0073] Take graphite, VGCF, PVDF (mass ratio 97:1:2), dissolve them in the solvent NMP to obtain the negative electrode slurry. Continuously coat the above negative electrode slurry on both sides of the copper foil, dry it, roll it after drying, and finally obtain the negative electrode plate; use a die cutter to die-cut the electrode plate.

[0074] (4) Assembly

[0075] Assemble the positive electrode plate, electrolyte sheet, and negative electrode plate prepared above in an alternating laminated manner and perform hot pressing treatment to obtain a solid-state battery monomer.

Claims

1. A method for preparing a positive electrode plate, characterized in that, Comprising: Providing nickel foam and a halide electrolyte precursor solution; Placing the nickel foam in the halide electrolyte precursor solution for heat treatment to form a halide solid electrolyte on the surface of the nickel foam, and then taking out the nickel foam for drying treatment; Mixing the dried nickel foam with a mixed powder containing a positive electrode active material and a binder, and then performing hot pressing treatment to obtain a positive electrode plate.

2. The preparation method according to claim 1, characterized in that, The halide electrolyte precursor solution contains LiX, as well as MX3 and / or NX3, and the resulting halide solid electrolyte is Li3N 1-a M a X6; wherein, X is a halogen element, and M and N are each at least one of indium, scandium, yttrium, erbium, and zirconium, and 0 ≤ a ≤ 1.

3. The preparation method according to claim 1, characterized in that, The temperature of the heat treatment is 120 - 550 °C, and the time is 3 - 5 h.

4. The preparation method according to claim 1, characterized in that, The temperature of the hot pressing treatment is 100 - 250 °C, and the pressure is 1 - 20 MP.

5. The preparation method according to claim 1, wherein The mass ratio of the halide solid electrolyte, the positive electrode active material, and the binder is (0.5 - 3):(93 - 98):(1 - 4).

6. The preparation method according to any one of claims 1-5, characterized in that, The positive electrode active material includes at least one of lithium-containing phosphate and lithium transition metal oxide; And / or, the binder includes at least one of polyvinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, hydrogenated nitrile rubber, and styrene-butadiene rubber.

7. The preparation method according to any one of claims 1-5, characterized in that, The thickness of the nickel foam is 3 - 5 mm.

8. A positive electrode plate, characterized in that, The positive electrode plate is prepared by the preparation method according to any one of claims 1 - 7.

9. The positive electrode sheet according to claim 8, wherein, The thickness of the positive electrode plate is 0.15 - 1 mm.

10. A solid-state battery, comprising a positive electrode and a negative electrode arranged opposite to each other, characterized in that, The positive electrode includes the positive electrode plate according to claim 8 or 9.

Images