A kind of all-solid lithium battery and preparation method thereof

A lithium battery, all-solid-state technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as large interface impedance and mutual diffusion of elements

Active Publication Date: 2020-07-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present disclosure is to provide an all-solid-state lithium battery and its preparation method, which can solve the problems of large interface impedance between the positive electrode and the solid-state electrolyte and interdiffusion of elements during the cycle in the prior art

Method used

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Examples

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preparation example Construction

[0038] The preparation method of the present disclosure can uniformly modify the surface of the positive electrode material to obtain a positive electrode active material whose surface is coated with a fluorine-containing lithium titanate layer with a controllable thickness. When the positive electrode active material is used in an all-solid lithium battery, it can avoid The interfacial reaction or element diffusion occurs between the material and the solid electrolyte to reduce the interfacial impedance.

[0039] In addition to the preparation method of the present disclosure, methods such as chemical vapor deposition, chemical vapor transport, or vacuum laser sputtering can also be used to prepare positive electrode active materials coated with a lithium fluorotitanate layer, but the cost of the above methods is very high. However, when the preparation method described in the present disclosure is adopted, a fluorine-containing lithium titanate layer with a uniform coating an...

Embodiment 1

[0063] (1) Contains F-Li 4 Ti 5 o 12 Preparation of positive electrode active material for layer

[0064] 100 g (grams) of positive electrode active material LiCoO 2 , 12 g of TiF 4 Mixed with 2 g of anhydrous LiOH evenly, and added to 500 mL of ethanol for stirring, the stirring time was 2 h, evaporated to dryness at 70 °C, the obtained precursor was fully ground and sintered at 700 °C at high temperature, the obtained The final product is F-Li 4 Ti 5 o 12 Material coated LiCoO 2 Cathode material.

[0065] (2) Preparation of positive electrode sheet C

[0066] 930g containing F-Li 4 Ti 5 o 12 Material coated LiCoO 2 Anode material (93%), 30 g binder PVDF (3%), 20 g acetylene black (2%), 20 g conductive agent carbon fiber (2%) were added to 1500 g solvent NMP (nitrogen methylpyrrolidone), Then stir in a vacuum mixer to form a stable and uniform cathode slurry. The positive electrode slurry was uniformly and intermittently coated on both sides of aluminum foil (a...

Embodiment 2

[0074] The electrolyte and lithium-ion battery of this example are prepared by the method in Example 1, the difference is that in step (1), the TiF 4 The amount of anhydrous LiOH was changed to 6 g and 1 g respectively, and other steps and operations were the same. The all-solid-state lithium battery CEA2 of this embodiment was obtained.

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Abstract

The disclosure relates to an all-solid-state lithium battery and a preparation method thereof. The all-solid-state lithium battery includes a positive electrode sheet, a negative electrode sheet and a solid electrolyte layer, the positive electrode sheet includes a positive electrode active material, and the positive electrode active material includes positive electrode material particles and a coating A fluorine-containing lithium titanate layer covering the surface of the positive electrode material particles. The method proposed in this disclosure adopts the mixed sintering reaction of the positive electrode material with titanium tetrafluoride and lithium salt to prepare the positive electrode active material with the surface of the positive electrode material coated with a fluorine-containing lithium titanate layer, which can uniformly modify the surface of the positive electrode material, Obtain a positive electrode material with controllable surface fluorine content and fluorine-containing lithium titanate layer thickness. When this positive electrode material is used in an all-solid lithium battery, it can stabilize the cladding layer structure and avoid interfacial reaction or element diffusion between the positive electrode material and the solid electrolyte. , to reduce the interface impedance.

Description

technical field [0001] The present disclosure relates to the field of solid-state lithium batteries, in particular, to an all-solid-state lithium battery and a preparation method thereof. Background technique [0002] Due to the serious interface effect between the positive electrode material and the solid-state electrolyte and the element diffusion problem at the interface of the all-solid-state lithium battery, the interface impedance between the positive electrode and the solid-state electrolyte is greatly increased, which greatly affects the performance of the battery. In the technology, the above-mentioned technical problems are usually solved by coating the surface of the positive electrode material, wherein the coating is usually an oxide, a lithium-containing transition metal oxide, or a fluoride. The cathode material is usually LiNbO 3 , LiTaO 3 , Li 4 Ti 5 o 12 、Al 2 o 3 、BaF 2 or CaF 2 etc., where for LiNbO 3 The cathode material for surface coating is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 历彪郭姿珠宋威易观贵谢静
Owner BYD CO LTD
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