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A preparing method of a nickel cobalt lithium aluminate cathode material

A technology of lithium nickel cobalt aluminate and positive electrode materials, which is applied to battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as difficult and uniform co-precipitation at the same time, achieve easy industrial production, simplify production difficulty, and solve poor uniformity Effect

Inactive Publication Date: 2015-07-01
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the problem that the three elements of nickel, cobalt, and aluminum are difficult to co-precipitate uniformly at the same time

Method used

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  • A preparing method of a nickel cobalt lithium aluminate cathode material
  • A preparing method of a nickel cobalt lithium aluminate cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mixed salt solution of nickel sulfate and cobalt sulfate, ammonia water and sodium hydroxide solution with a metal molar ratio of 85:15 were added to the reaction kettle at the same time through a metering pump, stirred at 80°C to form a precipitate, and the overflowed slurry was fully washed and washed. Filter and dry to obtain a filter cake and make nickel-cobalt compound dry powder.

[0037] The above dry powder, D 50 6um lithium carbonate, D 50 A 40nm aluminum oxide suspension was added simultaneously at a molar ratio of 1.00:1.00:0.10 for mixing and stirring, and was stirred and heated at 60°C. The dried material was sintered at 1000° C. for 10 h in a dry oxygen atmosphere. After sintering, the material is crushed to obtain the final product.

Embodiment 2

[0039] Mixed salt solution of nickel sulfate and cobalt chloride with a metal molar ratio of 80:20, ammonia water, and sodium carbonate solution are added to the reaction kettle at the same time through a metering pump, heated and stirred at 70°C to form a precipitate, and the overflowed slurry is fully washed and filtered, dried to obtain a filter cake and made into nickel-cobalt compound dry powder.

[0040] Mix and stir the above dry powder and aluminum nitrate solution, then add D 50 Lithium hydroxide of 2.1um, finally forming a mixed slurry with a molar ratio of 1.00:0.06:1.1, stirring and heating at 80°C. The dried material was sintered at 750° C. for 12 hours in a dry oxygen atmosphere. After sintering, the material is crushed to obtain the final product.

Embodiment 3

[0042] Nickel nitrate, cobalt sulfate mixed salt solution, ammonium bicarbonate solution, and sodium carbonate solution with a metal molar ratio of 83:17 were added to the reaction kettle at the same time through a metering pump, stirred at 60°C to form a precipitate, and the overflowed slurry was fully washed and filtered, dried to obtain a filter cake and made into nickel-cobalt compound dry powder.

[0043] The above dry powder, D 50 Stir 10um lithium hydroxide with appropriate amount of water, then add D 50 Alumina suspension of 50nm, finally forming a mixed slurry with a molar ratio of 1.00:1.10:0.06, stirring and heating at 70°C. The dried material was sintered at 900°C for 20h in a dry oxygen atmosphere. After sintering, the material is crushed to obtain the final product.

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Abstract

A preparing method of a nickel cobalt lithium aluminate cathode material is disclosed. Aluminum and lithium elements are introduced in one step in a wet material mixing process and evenly cover a nickel cobalt compound intermediate, thus avoiding the process difficulty that nickel, cobalt and lithium elements are difficult in uniform deposition in a precursor preparing process. The method is easy in industrial production. A production process of the method is free of pollution and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of a nickel-cobalt lithium aluminate positive electrode material. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high energy density, high working voltage, good cycle performance, small self-discharge, and small size. They have been widely used in mobile communication equipment, small electronic products, aerospace, and biomedicine. The performance of lithium-ion secondary batteries is mainly determined by its positive electrode materials. Among the currently commercialized lithium-ion battery positive electrode materials, LiNiO 2 The specific capacity of the material is the highest, but the cycle stability is obviously insufficient. Preparation such as LiNi by means of a small amount of doping and coating 0.8 co 0.15 Al 0.05 o 2 (NCA for short) and other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/485
CPCH01M4/362H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 刘大亮
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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