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Modified lithium ion battery positive electrode material and its preparation method and lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low surface residual lithium, high surface residual lithium, and increase the specific surface area of ​​materials, so as to improve high-temperature gas production, High practical application value, first discharge efficiency and improved cycle performance

Inactive Publication Date: 2018-06-26
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to: overcome the problems such as high residual lithium on the surface of the existing lithium-ion battery high-nickel positive electrode material, and the removal of residual lithium will increase the specific surface area of ​​the material, and provide a modified lithium-ion battery with low surface residual lithium and a small specific surface area. Lithium-ion battery positive electrode material and preparation method thereof, lithium-ion battery

Method used

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  • Modified lithium ion battery positive electrode material and its preparation method and lithium ion battery
  • Modified lithium ion battery positive electrode material and its preparation method and lithium ion battery
  • Modified lithium ion battery positive electrode material and its preparation method and lithium ion battery

Examples

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Embodiment 1

[0030] (1) Add 1g of boric acid to 100g of ethanol, stir for 5min, then add 100g of lithium-ion battery cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 . Utilize the residual LiOH and Li on the surface of the material 2 CO 3 React with boric acid to generate lithium boron oxide, heat to 60°C and stir until the organic solvent evaporates;

[0031] (2) Place the intermediate product obtained in step (1) in a vacuum oven at 120°C, and completely evaporate the residual organic solvent to dryness; place the obtained powder in an atmosphere sintering furnace for heat treatment, the sintering temperature is 400°C, and the sintering time is 5 hours , the heating rate is 1°C / min, the atmosphere is oxygen, and the gas flow is 0.1L / min. After the sample is cooled, the sample is crushed, ground and sieved to obtain the coating layer containing LiBO 2 and Li 2 B 4 o 7 The modified lithium-ion battery positive electrode material, the thickness of the coating layer is 5nm, and its SEM ...

Embodiment 2

[0033] The preparation method is the same as in Example 1. The difference is that the sintering temperature is changed to 200°C, and the sintering time is changed to 10 hours. Obtained cladding layer containing LiBO 2 and Li 2 B 4 o 7 The modified lithium-ion battery positive electrode material, the thickness of the coating layer is 5nm.

Embodiment 3

[0035] The preparation method is the same as in Example 1. The difference is that the sintering temperature is changed to 700°C, and the sintering time is changed to 1 hour. Obtained cladding layer containing LiBO 2 and Li 2 B 4 o 7 The modified lithium-ion battery positive electrode material, the thickness of the coating layer is 5nm.

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Abstract

The invention discloses a modified lithium ion battery positive electrode material. The surface of a lithium ion battery positive electrode material is coated with a lithium boron oxide coating layer.The lithium ion battery positive electrode material has a chemical formula of LiaNixCoyMn1-x-yO2, wherein a is greater than or equal to 0.95 and less than or equal to 1.05, x is greater than or equalto 0.6 and less than 1 and y is greater than or equal to 0.01 and less than 0.4. Through the lithium boron oxide coating layer on the surface of the lithium ion battery positive electrode material, the residual lithium on the surface is reduced without increasing the material specific surface area and the gas production of the material at a high temperature is improved. The modified lithium ion battery positive electrode material in the lithium ion battery can improve the first discharge efficiency and cycle performance of the battery and has a good application prospect. The invention also discloses a preparation method of the modified lithium ion battery positive electrode material and a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of new energy materials. More specifically, the invention relates to a modified lithium-ion battery cathode material with low residual lithium on the surface and a small specific surface area, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, wide application temperature range, low self-discharge rate, long cycle life, good safety performance, and no pollution. They have been used in various fields. Among them, high-nickel materials have higher energy Density has attracted widespread attention. However, as the nickel content increases, the lithium impurities on the surface of high-nickel materials are also higher, resulting in poor processing performance; and lithium impurities will deteriorate the gas production performance of the battery at high temperatures. The more lithium impurities, the more gas production S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/36H01M4/48H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/366H01M4/483H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杜锐柳娜刘勇超王嗣慧孟焕平刘永
Owner CONTEMPORARY AMPEREX TECH CO