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Surface-coated positive electrode material and preparation method and application thereof

A positive electrode material and surface coating technology, which is applied in the field of surface coated positive electrode materials and its preparation, can solve the problems of poor high-temperature cycle performance and achieve the effect of ensuring performance

Pending Publication Date: 2019-05-10
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal oxides such as molybdenum oxide and gallium oxide are usually used for coating. This type of material can improve the normal temperature cycle performance of the battery to a certain extent, but the effect of improving the high temperature cycle performance is not good.

Method used

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  • Surface-coated positive electrode material and preparation method and application thereof
  • Surface-coated positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Aluminum metaphosphate and alumina co-coated cathode materials

[0059] Step 1: Weigh 0.72g of ammonium dihydrogen phosphate and 0.16g of aluminum hydroxide and dissolve them in 30ml of deionized water respectively, and stir evenly. Then drop the aluminum hydroxide aqueous solution into the ammonium dihydrogen phosphate solution, and stir at 60°C for 20 minutes. Continue to add aluminum hydroxide solution dropwise, adjust the pH to 7-8, and continue to stir for 10 minutes to make a mixed solution.

[0060] In the second step, 200g of NCM523 positive electrode material was weighed, added to the mixed solution of the first step, stirred at high speed for 30 minutes, and then dried in an oven to make the NCM523 coating material matrix.

[0061] The third step is to put the NCM523 coating material matrix into an air furnace, first sinter at a constant temperature of 350°C for 2 hours, then raise the temperature to 600°C, sinter at a constant temperature for 4 hours, then a...

Embodiment 2

[0063] Aluminum metaphosphate and alumina co-coated cathode material

[0064] Step 1: Weigh 0.72g of ammonium dihydrogen phosphate and 0.16g of aluminum hydroxide and dissolve them in 30ml of deionized water respectively, and stir evenly. Then drop the aluminum hydroxide aqueous solution into the ammonium dihydrogen phosphate solution, and stir at 60°C for 20 minutes. Continue to add aluminum hydroxide solution dropwise, adjust the pH to 7-8, and continue to stir for 10 minutes to make a mixed solution.

[0065] In the second step, 200g of NCM523 positive electrode material was weighed, added to the mixed solution of the first step, stirred at high speed for 30 minutes, and then dried in an oven to make the NCM523 coating material matrix.

[0066] In the third step, put the NCM523 coating material matrix into an air furnace, sinter at a constant temperature of 600°C for 6 hours, then air-cool with the furnace, grind and sieve to obtain the surface-coated positive electrode ma...

Embodiment 3

[0068] Aluminum metaphosphate and alumina co-coated cathode material

[0069] Step 1: Weigh 0.72g of ammonium dihydrogen phosphate and 0.16g of aluminum hydroxide and dissolve them in 30ml of deionized water respectively, and stir evenly. Then drop the aluminum hydroxide aqueous solution into the ammonium dihydrogen phosphate solution, and stir at 60°C for 20 minutes.

[0070] In the second step, 200g of NCM523 positive electrode material was weighed, added to the mixed solution of the first step, stirred at high speed for 30 minutes, and then dried in an oven to make the NCM523 coating material matrix.

[0071] In the third step, the NCM523 coating material matrix was put into an air furnace, sintered at a constant temperature of 600°C for 6 hours, then air-cooled with the furnace, ground and sieved to obtain the surface-coated positive electrode material of Example 3.

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Abstract

The invention relates to a surface-coated positive electrode material and a preparation method and application thereof. The surface-coated positive electrode material comprises a substrate and a coating layer covering the substrate, wherein the substrate is a positive electrode material, and the composition of the coating layer contains aluminum metaphosphate. The surface-coated positive electrodematerial adopts aluminum metaphosphate to form the coating layer, so that the cycle performance of the positive electrode material of a lithium-ion battery, especially the high-temperature cycle performance can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a surface-coated cathode material and a preparation method and application thereof. Background technique [0002] With the development of new energy vehicles, the power system composed of lithium-ion batteries is required to meet the requirements of fast charging, high cruising range, and long cycle life. Lithium-ion battery cathode material is one of the important factors restricting the performance of lithium-ion batteries. Therefore, improving the performance of lithium-ion battery cathode materials is of great significance for improving the performance of lithium-ion batteries. In particular, nickel-cobalt-manganese ternary cathode materials, which have the advantages of high capacity and low cost, can better meet the requirements of high mileage and long cycle life of lithium-ion batteries, and are gradually favored by researchers. However, during use, due to si...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCY02E60/10
Inventor 叶超吴海燕常敬杭
Owner 湖南桑瑞新材料有限公司
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