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Post-processing process for aluminium oxide-coated lithium cobalt oxide

A technology for coating lithium cobaltate and alumina, which is applied in the direction of electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of destroying the integrity of the surface structure, affecting the electrochemical performance of the product, and being easy to corrode, so as to reduce the inertia components, increase the charge and discharge capacity, and increase the proportion of active materials

Active Publication Date: 2016-10-12
山东齐星新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has the advantages of low cost and high safety, but the disadvantage is that the aqueous aluminum salt is very acidic and easily corrodes LiCoO 2 , destroying the integrity of its surface structure, protons in water will interact with LiCoO 2 Lithium ion exchange in the structure, proton impurities are introduced into the structure, which affects the electrochemical performance of the coated product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix Li according to the Li:Co molar ratio of 1:1 2 CO 3 and Co 3 o 4 , sintered in air at 1000°C for 18 hours and cooled naturally; the prepared LiCoO 2 Quality (milligrams) and 0.135mol / L aluminum nitrate aqueous solution (milliliters) according to 1:20 ratio, LiCoO 2 Immerse in an aqueous solution of aluminum nitrate, stir and evaporate at 80°C, and heat the final precipitate at 450°C for 3 hours in the air, then naturally cool to obtain the product Al 2 o 3 -LiCoO 2 .

[0024] 5 g of the processed product Al 2 o 3 -LiCoO 2 Immerse in 500 ml of saturated lithium carbonate solution, stir and evaporate at 80°C for 5 minutes, filter and dry the product, then sinter at 700°C for half an hour, and cool naturally to obtain the final product.

[0025] The final product is used as the positive electrode active material, and the positive electrode is prepared according to the active material: PVDF: SuperP mass ratio of 8:1:1, the negative electrode is a lithium sheet...

Embodiment 2

[0029] Mix Li according to the Li:Co molar ratio of 1.01:1 2 CO 3 and Co 3 o 4 , sintered in air at 1000°C for 18 hours and cooled naturally; the prepared LiCoO 2 Quality (in milligrams) and 0.135M aluminum nitrate aqueous solution (in milliliters) according to 1:20 ratio, LiCoO 2 Immerse in an aqueous solution of aluminum nitrate, stir and evaporate at 80°C, and heat the finally obtained precipitate at 450°C in air for 3 hours, and obtain the product Al2O3-LiCoO2 after natural cooling.

[0030] 5 g of the processed product Al 2 o 3 -LiCoO 2 Immerse in 500 ml of saturated lithium carbonate solution, stir and evaporate at 80°C for 5 minutes, filter the product and dry it, then sinter at 700°C for half an hour, and cool naturally to obtain the final product.

[0031] The final product is used as the positive electrode active material, and the positive electrode is prepared according to the active material: PVDF: SuperP mass ratio of 8:1:1, the negative electrode is a lith...

Embodiment 3

[0035] Mix Li according to the Li:Co molar ratio of 1.02:1 2 CO 3 and Co 3 o 4 , sintered in air at 1000°C for 18 hours and cooled naturally; the prepared LiCoO 2 Quality (in milligrams) and 0.135M aluminum nitrate aqueous solution (in milliliters) according to 1:20 ratio, LiCoO 2 Immerse in an aqueous solution of aluminum nitrate, stir and evaporate at 80°C, and heat the finally obtained precipitate at 450°C in the air for 3 hours, then naturally cool to obtain the product Al 2 o 3 -LiCoO 2 .

[0036] 5 g of the processed product Al 2 o 3 -LiCoO 2 Immerse in 500 ml of saturated lithium carbonate solution, stir and evaporate at 80°C for 5 minutes, filter the product and dry it, then sinter at 700°C for half an hour, and cool naturally to obtain the final product.

[0037] The final product is used as the positive electrode active material, and the positive electrode is prepared according to the active material: PVDF: SuperP mass ratio of 8:1:1, the negative electrode...

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Abstract

The invention relates to a post-processing process for aluminium oxide-coated lithium cobalt oxide. The post-processing process comprises the following steps of taking a lithium carbonate water solution as the impregnation liquid; immersing the granules of the aluminium oxide-coated lithium cobalt oxide into the lithium carbonate solution, stirring and evaporating the solvent, filtering, and sintering the solid body obtained by the filtering, and naturally cooling to finish the post-processing of the aluminium oxide-coated lithium cobalt oxide. According to the post-processing process, the lithium carbonate water solution is used as the post-processing liquid; damage to the structure caused by the acid water solution in the wet coating process for lithium cobalt oxide by aluminium oxide can be avoided; the inert ingredients in the product are reduced; the proportion of the active materials in the product is improved; the product obtains a better electrochemical performance; and the charge-discharge capacity can be effectively increased.

Description

technical field [0001] The invention relates to a novel lithium-ion battery cathode material-Al 2 o 3 Coated LiCoO 2 The post-treatment process belongs to the technical field of lithium-ion battery materials. Background technique [0002] One of the biggest obstacles to the miniaturization of various high-end electronic products is the miniaturization of the battery. The premise of the miniaturization of the battery is to have a sufficiently high energy density. Therefore, the pursuit of high energy density has become a priority for lithium-ion battery researchers and developers. Target: There are many candidate cathode material systems for lithium-ion batteries, among which, lithium cobalt oxide (LiCoO 2 ) is the main choice for high-end lithium-ion battery cathode materials, and its effective capacity can be increased by increasing its charge cut-off voltage. [0003] The main way to increase the cut-off voltage of lithium cobaltate is alumina coating. The advantage of...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/48H01M10/0525
CPCH01M4/366H01M4/483H01M4/525H01M10/0525Y02E60/10
Inventor 耿海龙王振伟胡博
Owner 山东齐星新材料科技有限公司
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