Method for wrapping lithium cobalt oxide serving as anode material of lithium ion secondary battery through wet method

A cathode material, secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of uneven coating of lithium cobalt oxide materials, affecting performance, uneven dispersion, etc., to improve poor cycle performance. , The effect of suppressing battery inflation and simple preparation process

Inactive Publication Date: 2014-08-27
北京盟固利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

[0007] However, since the coating material is generally micron-sized particles, it is difficult to completely cover all the particles, and at the same time, the dispersion is uneven due to the characteristics of the material, both of which will lead to poor coating uniformity of lithium cobalt oxide, and it is difficult to effectively improve the gas swelling of lithium-ion batteries. and the problem of capacity fading
[0008] In Chinese patents CN101880066A, CN102779976A and CN103618080A, although the preparation process adopted is simple, there is still the problem of uneven coating of lithium cobalt oxide material, which affects its performance

Method used

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  • Method for wrapping lithium cobalt oxide serving as anode material of lithium ion secondary battery through wet method
  • Method for wrapping lithium cobalt oxide serving as anode material of lithium ion secondary battery through wet method
  • Method for wrapping lithium cobalt oxide serving as anode material of lithium ion secondary battery through wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] 1) prepare the aqueous solution of zinc acetate, wherein, the weight ratio of zinc acetate and water is 1:500, and the pH value of aqueous solution is 7;

[0075] 2) Take 43ml of the aqueous solution in step 1), add 100g of positive electrode material lithium cobaltate to the aqueous solution, and stir at a stirring rate of 400rpm for 1h to form a slurry;

[0076] 3) After baking the slurry in step 2) in an oven at 100°C for 24 hours, pass through a 60-mesh sieve;

[0077] 4) The dried product in step 3) was calcined at 700° C. for 5 hours, cooled naturally to room temperature, ground properly, and passed through a 200-mesh sieve to obtain the coated material of the positive electrode material lithium cobaltate.

[0078] Measured by the Malvern particle size tester: the median diameter (D50) of the coated material is 14.3 microns;

[0079] After the final product is tested, the pH value is 10.3 and the specific surface area is 0.18m 2 / g;

Embodiment 2

[0081] 1) prepare the aqueous solution of magnesium acetate, wherein, the weight ratio of magnesium acetate and water is 1:500, and the pH value of aqueous solution is 7;

[0082] 2) Take 43ml of the aqueous solution in step 1), add 100g of positive electrode material lithium cobaltate to the aqueous solution, and stir at a stirring rate of 400rpm for 1h to form a slurry;

[0083] 3) After baking the slurry in step 2) in an oven at 100°C for 24 hours, pass through a 60-mesh sieve;

[0084] 4) The dried product in step 3) was calcined at 700° C. for 5 hours, cooled naturally to room temperature, ground properly, and passed through a 200-mesh sieve to obtain the coated material of the positive electrode material lithium cobaltate.

[0085] Measured by a Malvern particle size tester: the median diameter (D50) of the coated material is 14.1 microns.

[0086] After the final product is tested, the pH value is 10.3 and the specific surface area is 0.17m 2 / g.

Embodiment 3

[0088] 1) prepare the aqueous solution of manganese acetate, wherein, the weight ratio of manganese acetate and water is 1:500, and the pH value of aqueous solution is 7;

[0089] 2) Take 43ml of the aqueous solution in step 1), add 100g of positive electrode material lithium cobaltate to the aqueous solution, and stir at a stirring rate of 400rpm for 1h to form a slurry;

[0090] 3) Bake the slurry in step 2) in an oven at 100°C for 24 hours, and pass through a 60-mesh sieve;

[0091] 4) The dried product in step 3) was calcined at 700° C. for 5 hours, cooled naturally to room temperature, ground properly, and passed through a 200-mesh sieve to obtain the coated material of the positive electrode material lithium cobaltate.

[0092] Measured by a Malvern particle size tester: the median diameter (D50) of the coated material is 14.2 microns.

[0093] After the final product is tested, the pH value is 10.3 and the specific surface area is 0.18m 2 / g.

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Abstract

The invention discloses a method for wrapping lithium cobalt oxide serving as an anode material of a lithium ion secondary battery through a wet method. According to the method for wrapping the lithium cobalt oxide serving as the anode material of the lithium ion secondary battery through the wet method, a soluble metal salt solution is added to the lithium cobalt oxide serving as the anode material, then stirring is conducted, the surface of the lithium cobalt oxide serving as the anode material is completely and evenly wrapped in a layer of corresponding metallic oxide after thermal treatment is conducted, in this way, the circulation performance of the lithium ion secondary battery at high voltage is effectively improved, and the expansion degree of the lithium ion secondary battery is reduced.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion secondary batteries, and in particular relates to a method for wet coating lithium cobalt oxide, the positive electrode material of lithium ion secondary batteries. Background technique [0002] At present, lithium-ion secondary battery cathode materials include lithium manganese oxide, ternary materials, lithium iron phosphate, nickel-cobalt-aluminum (NCA) and lithium cobalt oxide. [0003] Among them, lithium manganate has a wide and abundant source of raw materials, cheap price, excellent rate performance, and mature technology. It is often used in power batteries, but its high temperature resistance and cycle performance are not good; There will be a phenomenon of battery capacity diving, and the cycle performance is poor; lithium iron phosphate has excellent safety and is considered to be the preferred material for power batteries, but due to its low capacity, poor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525
CPCY02E60/122H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 白珍辉江卫军魏卫高利亭陈宇张溪苏迎春
Owner 北京盟固利新材料科技有限公司
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