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Method for preparing alumina coated lithium cobalt oxide lithium ion battery material by aluminum salt solution aftertreatment

A technology for coating lithium cobalt oxide and lithium ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as increasing cost and operation complexity, and achieve easy industrial application, low cost and risk, electrical Superior performance

Inactive Publication Date: 2016-03-23
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

However, this adds additional cost and operational complexity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix Li according to the Li:Co molar ratio of 1.07:1 2 CO 3 and Co 3 o 4 , sintered at 1000°C for 18 hours in an air atmosphere and cooled naturally to obtain LiCoO 2 ; 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 to obtain a residue; heat the residue at 450°C in the air for 3 hours, and cool naturally to obtain the final product alumina-coated lithium cobaltate (Al 2 o 3 -LiCoO 2 ).

[0028] Take Al 2 o 3 -LiCoO 2 As the positive electrode active material, according to the active material: PVDF: SuperP mass ratio of 8:1:1, the positive electrode is prepared, the negative electrode is lithium sheet, the electrolyte is 1mol / LLiPF6 / EC+DMC, the diaphragm is Celgad2400 diaphragm, and it is assembled into a 2032 simulation battery . Under 0.1C magnification, 3.0-4.30V voltage range, the first measur...

Embodiment 2

[0031] Mix Li according to the Li:Co molar ratio of 1.08:1 2 CO 3 and Co 3 o 4 , sintered at 900°C for 19 hours in an air atmosphere and cooled naturally to obtain LiCoO 2 ; Prepared LiCoO 2 Quality (milligrams) and 0.135mol / L aluminum nitrate aqueous solution (milliliters) according to 1:15 ratio, LiCoO 2 Immerse in an aqueous aluminum nitrate solution, stir and evaporate at 70°C to obtain a residue; heat the residue at 440°C in air for 4 hours, and cool naturally to obtain the final product alumina-coated lithium cobaltate (Al 2 o 3 -LiCoO 2 ).

[0032] Take Al 2 o 3 -LiCoO 2 As the positive electrode active material, according to the active material: PVDF: SuperP mass ratio of 8:1:1, the positive electrode is prepared, the negative electrode is lithium sheet, the electrolyte is 1mol / LLiPF6 / EC+DMC, the diaphragm is Celgad2400 diaphragm, and it is assembled into a 2032 simulation battery . Under 0.1C magnification, 3.0-4.30V voltage range, the first measured capac...

Embodiment 3

[0035] Mix Li according to the Li:Co molar ratio of 1.09:1 2 CO 3 and Co 3 o 4 , sintered at 1100°C for 17 hours in an air atmosphere and cooled naturally to obtain LiCoO 2 ; Prepared LiCoO 2 Mass (milligrams) and 0.2mol / L aluminum nitrate aqueous solution (milliliters) according to the ratio of 1:12, LiCoO 2Immerse in an aqueous solution of aluminum nitrate, stir and evaporate at 90°C to obtain a residue; heat the residue at 460°C in the air for 2 hours, and cool naturally to obtain the final product alumina-coated lithium cobaltate (Al 2 o 3 -LiCoO 2 ).

[0036] Take Al 2 o 3 -LiCoO 2 As the positive electrode active material, according to the active material: PVDF: SuperP mass ratio of 8:1:1, the positive electrode is prepared, the negative electrode is lithium sheet, the electrolyte is 1mol / LLiPF6 / EC+DMC, the diaphragm is Celgad2400 diaphragm, and it is assembled into a 2032 simulation battery . Under 0.1C rate, 3.0-4.30V voltage range, the first measured capac...

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Abstract

The invention relates to a method for preparing an alumina coated lithium cobalt oxide lithium ion battery positive pole material by aluminum salt solution aftertreatment, the method comprises the steps that (1) a lithium source and a cobalt source are mixed according to the molar ratio of Li:Co of (1+x):1, wherein x is equal to or larger than 0.07 and smaller than or equal to 0.1, sintering is performed at the temperature of 800 DEG C to 1,200 DEG C for 15-20 h, and LiCoO2 is obtained; (2) the LiCoO2 is added to an aluminum salt water solution and mixed uniformly, then the water solution is stirred and evaporated completely, and a residual is obtained; (3) the residual is sintered at the temperature of 400 DEG C to 500 DEG C for 2-5 h, and the material is obtained. According to the method, the use of an organic aluminum chemical reagent is avoided, the cost and the hazard are low, and the method is easy for industrial application; the content of lithium carbonate in an LiCoO2 product is improved with the method that adequate lithium source is used in lithium cobalt oxide synthesis, the acidity of the aluminum salt water solution is neutralized, strong corrosion damage of the aluminum salt water solution to lithium cobalt oxide is prevented, and the exchange interaction of protons and lithium ions is prevented.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a method for preparing an aluminum oxide-coated lithium cobaltate lithium ion battery positive electrode material by post-processing an aqueous solution of aluminum salt, and belongs to the technical field of lithium ion batteries. Background technique [0002] The pursuit of high energy density has always been the goal of lithium-ion battery researchers and developers; there are many candidates for its positive electrode materials, among which lithium cobalt oxide (LiCoO 2 ) is the main choice of high-end lithium-ion battery cathode material, by increasing its charge cut-off voltage to increase its effective capacity. The main way to increase its cut-off voltage is alumina coating. The advantage of alumina coating is to properly isolate the matrix material from the electrolyte and protect the stability of the matrix material struct...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M10/0525
CPCH01M4/366H01M4/525H01M10/0525Y02E60/10
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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