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Aluminum-coated precursor as well as preparation method and application thereof

A technology of precursor and aluminum coating, which is applied in the field of aluminum coating precursor and its preparation, can solve the problems of poor sphericity, low vibration, small particle size, etc., and achieve improved sphericity, uniform particle size distribution, vibration The effect of high solid density

Active Publication Date: 2020-07-21
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical characteristics of lithium-rich manganese-based materials such as morphology, particle size distribution, and tap density largely depend on the precursors. However, the lithium-rich manganese-based precursors currently on the market have small particle size and low tap density (≤ 1.5g / cm 3 ), poor sphericity, etc.

Method used

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  • Aluminum-coated precursor as well as preparation method and application thereof
  • Aluminum-coated precursor as well as preparation method and application thereof
  • Aluminum-coated precursor as well as preparation method and application thereof

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preparation example Construction

[0075]According to the method for preparing an aluminum-coated precursor according to an embodiment of the present invention, firstly, in the presence of a conductive agent, carbon dioxide is continuously introduced, and then a metal salt and a precipitant are added. The continuous introduction of carbon dioxide can adjust the pH of the system and maintain the pH of the system. The inert environment prevents metal elements from being oxidized during the co-precipitation process, and can improve the sphericity of the precursor, while the conductive agent can improve the rate performance of the material, and then the slurry obtained by mixing the prefabricated particles with water is continuously passed through Add metal salts, precipitants, carbon dioxide and complexing agents. Complexing agents can reduce the reaction speed of the system and inhibit the formation of new particles in the system. Metal salts and precipitants use small prefabricated particles as crystal seeds in th...

Embodiment 1

[0087] The method for preparing the aluminum-coated precursor is as follows:

[0088] (1) Nickel sulfate, cobalt sulfate, and manganese sulfate are mixed according to the molar ratio of nickel, cobalt, and manganese to 0.2:0.18:0.6 to obtain a mixed metal salt, and the concentration of nickel sulfate, cobalt sulfate, and manganese sulfate in the mixed metal salt is 400g / L, and then in the presence of conductive agent glucose, carbon dioxide is continuously introduced at a flow rate of 0.1L / min, and then the mixed metal salt is quickly mixed with a sodium hydroxide solution with a concentration of 200g / L (mixing is completed within 10 seconds) , wherein the molar ratio of the mixed metal salt to sodium hydroxide is 1:2.0, and based on the total amount of 1L mixed metal salt and sodium hydroxide, the amount of conductive agent glucose is 20g), and then sealed at 30 degrees Celsius for 12 hours , to obtain prefabricated particles with a particle size of 1.2 microns;

[0089] (2)...

Embodiment 2

[0097] The method for preparing the aluminum-coated precursor is as follows:

[0098] (1) Mix nickel chloride, cobalt chloride, and manganese chloride according to the molar ratio of nickel, cobalt, and manganese to 0.2:0.09:0.7 to obtain a mixed metal salt, and nickel chloride, cobalt chloride, and chlorine in the mixed metal salt The concentration of manganese oxide is 300g / L, and then in the presence of the conductive agent fructose, carbon dioxide is continuously introduced at a flow rate of 0.5L / min, and then the mixed metal salt is quickly mixed with a sodium hydroxide solution with a concentration of 50g / L (Complete mixing within 10 seconds, wherein, the mol ratio of mixed metal salt and sodium hydroxide is 1: 3.5, based on the total amount of 1L mixed metal salt and sodium hydroxide simultaneously, the consumption of conductive agent fructose is 30g), then at 80 Celsius sealed and left standing for 18 hours to obtain prefabricated particles with a particle size of 1.5 ...

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Abstract

The invention discloses an aluminum-coated precursor and a preparation method thereof. The chemical formula of the aluminum-coated precursor is xMCO3(1-x)Al(OH)3, M is at least one of nickel, cobalt and manganese, and x is 0.995-0.999. The aluminum-coated precursor has the advantages of controllable particle size, uniform particle size distribution, high degree of sphericity, smooth particle surface, high tap density, low possibility of breakage and excellent electrochemical performance and energy density, and meanwhile, a positive electrode material prepared from the precursor has relativelyhigh specific capacity and excellent cycle performance and electrochemical discharge performance.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to an aluminum-coated precursor and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries play an important role in daily life. The development of the new energy vehicle industry has put forward new requirements for lithium-ion batteries, and the improvement of its energy density is imminent. Lithium-rich manganese-based cathode materials have a high specific capacity of 250mAh / g to 350mAh / g, are low in price, are environmentally friendly, and have high research value. The preparation of existing lithium-rich manganese-based cathode materials is generally divided into two steps, the first step is the preparation of lithium-rich precursors; the second step is the sintering of the precursors. The physical characteristics of lithium-rich manganese-based materials such as morphology, particle size distribution, and tap density lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G53/06C01F7/30H01M4/485H01M4/505H01M4/525H01M10/0525H01M4/02
CPCC01G53/006C01G53/06C01F7/30C01G53/44H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2220/20C01P2004/80C01P2006/10C01P2006/40Y02E60/10C01P2004/61C01P2006/11C01P2004/03C01G53/42C01P2004/32C01G53/50C01P2002/54C01P2004/84H01M2004/021
Inventor 张勇杰万江涛任海朋张宁拉杰什·麦加朱金鑫普拉杰什·PP
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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