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Solid-state battery and preparation method thereof, and electric vehicle

A technology of solid-state batteries and solid-state electrolytes, which is applied in battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., and can solve problems such as increased grain boundary resistance, low compaction density, and short-circuiting of lithium dendrites

Active Publication Date: 2020-07-03
SHENZHEN BYD LITHIUM BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The assembly of the original solid-state battery has the following disadvantages: 1. After the electrode material, especially the positive electrode material and the electrolyte powder are mixed and pressurized for assembly, there is a large particle gap, the compaction density is low, and the volume energy density is reduced
2. Its serious interparticle contact problem increases the grain boundary resistance and affects the final performance of the battery
3. The assembly of the positive plate and the electrolyte is made by pressing twice, and there are often serious interface problems between them, which increases the internal resistance of the battery
4. If the lithium negative electrode is directly used, there will be a serious short-circuit problem of lithium dendrites. If lithium metal is not used as the negative electrode, the energy density will be reduced. Therefore, the electrolyte or lithium negative electrode must be modified to increase the process difficulty and cost of the entire battery assembly.

Method used

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  • Solid-state battery and preparation method thereof, and electric vehicle
  • Solid-state battery and preparation method thereof, and electric vehicle
  • Solid-state battery and preparation method thereof, and electric vehicle

Examples

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preparation example Construction

[0061] The second purpose of the present application is to provide a method for preparing a solid-state battery, the method comprising:

[0062] S1. Provide a positive electrode layer, the positive electrode layer includes a positive electrode current collector and a positive electrode active material layer located on the surface of the positive electrode current collector, the positive electrode active material layer includes positive electrode active particles and first solid electrolyte particles; heating the positive electrode layer to make The first solid electrolyte particles in the positive electrode layer are completely melted;

[0063] S2. Provide a composite layer, the composite layer includes a negative electrode current collector and a solid electrolyte layer located on the surface of the negative electrode current collector, the solid electrolyte layer includes second solid electrolyte particles; heating the composite layer makes the second solid electrolyte layer ...

Embodiment 1

[0078] (1) Fabrication of composite layer of negative electrode A and solid electrolyte E

[0079] The composition percentage of the solid electrolyte described in this example is as follows: with 75Li 2 S-25P 2 S 5 as an example.

[0080] The production process is as follows: in a glove box with an argon atmosphere, the stoichiometric ratio of Li 2 S (7.03g), P 2 S 5 (11.33g) was mixed and added to a 50ml sealed ball mill jar for 500rpm ball milling for 8h, then taken out and ground into powder, and put into 50g of toluene solution, and then heated and stirred the solid electrolyte slurry. The solid electrolyte slurry was continuously coated on the negative electrode current collector A with a coating thickness of 70 μm and dried at 333 K to obtain a composite EA, which was cut into a size of 100 mm (length) × 100 mm (width). The good EA was placed on a hot plate and heated to 700°C to melt and spread for 30 minutes, and set aside for later use.

[0081] (2) Production...

Embodiment 2

[0086] The solid-state battery was prepared by the same method as in Example 1, except that in step (1), the heating time of EA was 20 min, and in step (2), the heating time was 10 min, and the obtained battery was denoted as S2.

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Abstract

The invention provides a solid-state battery and a preparation method thereof, and an electric vehicle. The solid-state battery comprises a positive electrode layer, a solid-state electrolyte layer located on the surface of the positive electrode layer and a negative electrode current collector located on the surface of the solid-state electrolyte layer, wherein the positive electrode layer comprises a positive electrode current collector and a positive electrode active material layer positioned on the surface of the positive electrode current collector, the positive electrode active materiallayer comprises positive electrode active particles and a first solid-state electrolyte, the first solid-state electrolyte is coated on the surfaces of the positive electrode active particles and / or filled among the positive electrode active particles in a completely molten and immediately quenched state, the solid-state electrolyte layer comprises a second solid-state electrolyte, the second solid-state electrolyte is clamped between the positive electrode layer and the negative electrode current collector in a state of complete melting and immediate quenching, and the density of the solid-state battery is 96-100%. According to the invention, the high density can greatly inhibit the short circuit problem caused by the growth of lithium dendrites, and the volume energy density and the charge-discharge cycle performance of the solid-state battery are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a solid-state battery, a preparation method thereof, and an electric vehicle. Background technique [0002] Inorganic all-solid-state lithium battery is a lithium-ion battery assembled with solid electrolyte and positive and negative electrodes. Since it does not use organic electrolyte, its safety is greatly improved, and it is expected to have higher energy density and higher cycle life. . The battery is composed of powdered solid electrolyte, composite negative electrode, and composite positive electrode under certain pressure, or a lithium alloy negative electrode such as LiIn is used to assemble a solid-state battery under certain pressure. The quality of the solid-state battery assembly process directly affects the quality of the contact between particles, which in turn affects the overall performance of the battery. [0003] The assembly of the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/36H01M4/485H01M4/525H01M4/587H01M10/0562H01M10/058
CPCH01M4/364H01M4/485H01M4/525H01M4/587H01M10/0525H01M10/0562H01M10/058Y02E60/10Y02P70/50
Inventor 胡屹伟郭姿珠历彪
Owner SHENZHEN BYD LITHIUM BATTERY
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