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Coating method of positive electrode material for lithium ion battery

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of affecting electrochemical reaction activity and poor conductivity, and achieves inhibition of redox side reactions and good conductivity. , the effect of high conductivity and lithium ion diffusion coefficient

Inactive Publication Date: 2021-02-26
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method can effectively improve the lithium cobalt oxide (LiCoO 2 ) The surface stability of the positive electrode material can inhibit the occurrence of side reactions, but due to its poor conductivity, it affects the lithium cobaltate (LiCoO 2 ) The electrochemical reactivity of the cathode material

Method used

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  • Coating method of positive electrode material for lithium ion battery
  • Coating method of positive electrode material for lithium ion battery
  • Coating method of positive electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 200g of lithium cobalt oxide (LiCoO 2 ) positive electrode material powder, weigh 0.04g nano zirconium diboride (ZrB 2) powder, the lithium cobaltate positive electrode material powder and nano zirconium diboride powder to be coated are added to the planetary ball mill, and 200-300 grams of mixing balls are added, and after mixing for 30 minutes, the mixing balls are separated by passing through a 200-mesh sieve , to obtain mixed powder.

[0029] Transfer the mixed powder to a sagger, transfer the sagger to a muffle furnace, and heat up from room temperature to 900°C at a rate of 5°C / min for calcination for 10 hours. During the sintering process, air is continuously introduced as an oxygen source; After cooling to room temperature, it was taken out to obtain a sintered mixed powder.

[0030] Place the sintered mixed powder in a small universal pulverizer for 20 seconds, pour the pulverized sample into a 325-mesh sieve for sieving, collect the sieved sample, and ...

Embodiment 2

[0038] Weigh 200g of lithium cobalt oxide (LiCoO 2 ) positive electrode material powder, weigh 2g nano zirconium diboride (ZrB 2 ) powder, the lithium cobaltate positive electrode material powder and nano zirconium diboride powder to be coated are added to the planetary ball mill, and 200-300 grams of mixing balls are added, and after mixing for 30 minutes, the mixing balls are separated by passing through a 200-mesh sieve , to obtain mixed powder.

[0039] Transfer the mixed powder to a sagger, transfer the sagger to a muffle furnace, and heat up from room temperature to 900°C at a rate of 5°C / min for calcination for 10 hours. During the sintering process, air is continuously introduced as an oxygen source; After cooling to room temperature, it was taken out to obtain a sintered mixed powder.

[0040] Place the sintered mixed powder in a small universal pulverizer for 20 seconds, pour the pulverized sample into a 325-mesh sieve for sieving, collect the sieved sample, and ob...

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Abstract

The invention discloses a coating method of a positive electrode material for a lithium ion battery. The method comprises the following steps: (1) uniformly mixing a positive electrode material powderfor a lithium ion battery to be coated with a nano zirconium diboride powder to obtain a mixed powder, wherein the mass of the nano zirconium diboride powder is 0.02%-1% of the mass of the positive electrode material powder for the lithium ion battery to be coated; (2) sintering the mixed powder, and cooling to a room temperature to obtain a sintered mixed powder, wherein the sintering process conditions are as follows: the sintering temperature is 400 DEG C- 1000 DEG C, the sintering time is 2h-20h, and the sintering is carried out in an air atmosphere or an oxygen atmosphere; and (3) crushing and sieving the sintered mixed powder to obtain the coated positive electrode material for the lithium ion battery. The conductivity of the positive electrode material for the lithium ion battery is improved through surface modification of zirconium diboride (ZrB2), meanwhile, an interface protection effect is achieved, and a redox side reaction at an interface is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a coating method for positive electrode materials for lithium ion batteries. Background technique [0002] With the rapid development of portable 3C electronic products such as notebook computers and mobile phones, especially the arrival of the era of smart phones, mobile phones continue to develop in the direction of intelligence, large screens, and multi-functions. People continue to put forward higher energy density requirements for lithium-ion batteries. Require. Lithium cobalt oxide (LiCoO 2 ) is a commercial positive electrode material, which has the advantages of high working voltage, high compaction density, and long cycle life. Using it to make lithium-ion batteries has the advantages of small size, large power, long standby time, light and easy to carry , suitable for the design of electronic products such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 许开华杨克涛王彦刚
Owner GEM JIANGSU COBALT IND CO LTD
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