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Composite electrode material of solid-state lithium battery and preparation method thereof

A technology of composite electrodes and solid electrolytes, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low lithium ion conductivity and high internal resistance, and achieve the effects of increasing conduction rate, reducing interface resistance, and improving safety

Inactive Publication Date: 2017-06-20
NIO NEXTEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low conductivity and high internal resistance of lithium ions between the solid electrolyte and the electrode active material layer, improve the rate discharge performance, enhance the stability and cycle performance of solid-state lithium batteries, and improve the safety of lithium-ion batteries sex

Method used

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  • Composite electrode material of solid-state lithium battery and preparation method thereof
  • Composite electrode material of solid-state lithium battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The positive electrode is lithium cobalt oxide, the negative electrode is lithium titanate, and the solid electrolyte is Li 7 La 2 Zr 2 o 12 . Weigh 0.0882g of Li according to the coating weight ratio of 15:85 7 La 2 Zr 2 o 12 Powder, 0.5g of lithium cobaltate powder. The above powders were manually mixed in a mortar, then transferred to a zirconia ball mill jar, equipped with an appropriate amount of zirconia balls, and ball milled at a speed of 400r / min. After 12 hours of ball milling, the mixed powder was taken out. Transfer the mixed powder into a zirconia crucible, put the crucible into a muffle furnace, and sinter at 1125°C with a heating rate of 5°C / min and a sintering time of 6 hours. After sintering, a composite positive electrode material is obtained.

[0055] Similarly, weigh 0.0882g of Li according to the coating weight ratio of 15:85 7 La 2 Zr 2 o 12 powder and 0.5 g of lithium titanate powder, and repeat the above method to obtain a composite ...

Embodiment 2

[0059] Lithium cobaltate is used for the positive electrode, graphite is used for the negative electrode, and Li 7 La 2 Zr 2 o 12 . According to the coating weight ratio of 15:85, three raw materials Li with a total molar ratio of 3.5:1:1 were weighed with a total amount of 0.0882g. 2 CO 3 , La 2 o 3 , ZrO 2 as Li 7 La 2 Zr 2 o 12 Precursor powder, and 0.5g of lithium cobalt oxide powder. The above powders were manually mixed in a mortar, then transferred to a zirconia ball mill jar, equipped with an appropriate amount of zirconia balls, and ball milled at a speed of 400r / min. After 12 hours of ball milling, the mixed powder was taken out. Transfer the mixed powder into a zirconia crucible, put the crucible into a muffle furnace, and sinter at 1125°C with a heating rate of 5°C / min and a sintering time of 6 hours. After sintering, a composite positive electrode material is obtained.

[0060] Similarly, weigh 0.0882g of Li according to the coating weight ratio of 1...

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Abstract

The purpose of the invention is to provide a composite electrode material suitable for a solid-state lithium battery, wherein the composite electrode material comprises an electrode active material layer and a solid electrolyte layer coated on the surface of the electrode active material layer. According to the invention, the composite electrode material is prepared by combining the mechanical mixing with the high temperature sintering. The invention also provides a all-solid-state lithium ion battery by means of the composite electrode material.

Description

technical field [0001] The invention relates to a novel composite electrode material for solid-state lithium batteries and a preparation method thereof. In addition, the invention also relates to an all-solid lithium ion battery using the composite electrode material. Background technique [0002] Due to the use of flammable and explosive organic carbonate electrolyte as the organic electrolyte solution in the traditional structure of power lithium-ion batteries, frequent accidents such as electrolyte leakage and resulting battery explosions and fires have occurred. At present, to improve the safety of lithium-ion batteries, an effective way is to use all-solid-state batteries. On the one hand, simplifying battery safety devices greatly improves safety while reducing costs. [0003] For all-solid-state batteries, the interface contact state between the solid electrolyte and the electrode active material directly affects the battery performance. The main reason is that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525H01M10/0562
CPCH01M4/36H01M10/0525H01M10/0562Y02E60/10
Inventor 马丽张琦葛增芳
Owner NIO NEXTEV LTD
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