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All-solid-state lithium battery positive electrode sheet and preparation method thereof, and all-solid-state lithium battery

A positive electrode, lithium battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor battery rate performance and capacity volatility, poor lithium ion conductivity, and large interface resistance of positive electrodes. The effect of low impedance, simple preparation process and high discharge capacity

Active Publication Date: 2022-02-15
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an all-solid-state lithium battery positive plate to at least solve the problems existing in the prior art, such as large positive plate interface resistance, poor lithium ion conductivity, and poor battery rate performance and capacity volatility caused thereby.

Method used

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  • All-solid-state lithium battery positive electrode sheet and preparation method thereof, and all-solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The positive electrode sheet of the all-solid-state lithium battery in this embodiment, its functional layer is formed from 80 parts of lithium cobalt oxide, 5 parts of carbon nanotubes, 5 parts of PVDF, and 10 parts of composite solid electrolyte, and is specifically prepared according to the following preparation process:

[0033] (1) LiCl and BCl with a molar ratio of 3:1 3 Dissolved in THF solvent and dried to obtain Li 3 BCl 6 (solid electrolyte); the Li 3 BCl 6 As a target, it was sputtered on Li 3 PO 4 particles, and then heated at 200°C for 8 hours in a dry environment to obtain a composite solid electrolyte with a core-shell structure;

[0034] (2) Add 80 parts of lithium cobaltate, 5 parts of carbon nanotubes and 5 parts of PVDF (dissolve PVDF in NMP first to form a 5wt% solution, take 100 parts of the 5wt% solution) and mix in 100 parts of NMP Uniformly form a slurry, add 10 parts of the above-mentioned composite solid electrolyte to the slurry, mix uni...

Embodiment 2

[0036] The positive electrode sheet of the all-solid-state lithium battery provided in this example, its functional layer is formed from 85 parts of lithium cobalt oxide, 4 parts of carbon nanotubes, 1 part of PVDF binder and 10 parts of composite solid electrolyte, specifically according to the following preparation process have to:

[0037] (1) LiCl and AlCl with a molar ratio of 3:1 3 Dissolved in water and dried to give Li 3 AlCl 6 ; Will Li 3 AlCl 6 As a target, it was sputtered on Li 3 PO 4 particles, and then heated at 300°C for 8 hours in a dry environment to obtain a composite solid electrolyte with a core-shell structure;

[0038] (2) Referring to the method of step (2) in Example 1, according to the mass parts of the raw materials of each functional layer in the present example above, an all-solid-state lithium battery positive electrode sheet was prepared.

Embodiment 3

[0040] The positive electrode sheet of the all-solid-state lithium battery provided in this example, its functional layer is formed from 82 parts of lithium iron phosphate, 6 parts of acetylene black, 2 parts of PVDF, and 10 parts of composite solid electrolyte, and is specifically prepared according to the following preparation process:

[0041] (1) LiCl and GaCl with a molar ratio of 3:1 3 Dissolved in water and dried to give Li 3 GaCl 6 solid electrolyte; the Li 3 GaCl 6 As a target, it was sputtered on Li 0.3 B 0.9 PO 4 particles, and then heated at 300°C for 8 hours in a dry environment to obtain a composite solid electrolyte with a core-shell structure;

[0042] (2) Referring to the method of step (2) in Example 1, according to the mass parts of the raw materials of each functional layer in the present example above, an all-solid-state lithium battery positive electrode sheet was prepared.

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Abstract

The invention provides an all-solid lithium battery positive electrode sheet, a preparation method thereof, and an all-solid lithium battery. The positive electrode sheet is formed by mixing and compacting functional layer raw materials including lithium-containing active materials, conductive agents and composite solid electrolytes. The functional layer; wherein, the composite solid electrolyte has a core-shell structure, the raw material of the core is deformable lithium salt, and the raw material of the shell is a solid electrolyte. The positive electrode sheet of the all-solid-state lithium battery provided by the present invention has characteristics such as high ion transmission capacity, and enables the all-solid-state lithium battery formed by using the positive electrode sheet to have high ion conductivity, low impedance, and high discharge capacity And other excellent performance.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an all-solid-state lithium battery positive plate, a preparation method thereof, and an all-solid-state lithium battery. Background technique [0002] With the development and progress of society, the demand for energy is also increasing, and the use of existing fossil energy can easily lead to serious environmental problems such as chemical pollution and greenhouse effect, so it is urgent to develop some new energy and related equipment to Alleviate or solve energy problems. Since the advent of lithium-ion batteries in the 1990s, they have been widely used in digital 3C, electric vehicles and even large energy storage power stations due to their relatively high energy density, long cycle life, high cell voltage and environmental friendliness. [0003] Lithium-ion batteries can be divided into liquid lithium-ion batteries and solid-state lithium-ion batteries. Among them, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M10/0525H01M10/0562
CPCH01M4/131H01M4/1391H01M10/0525H01M10/0562H01M2004/028Y02E60/10
Inventor 陈锡龙赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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