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A method for preparing chromium-doped nickel-cobalt lithium aluminate gradient cathode material for lithium batteries

A technology of lithium nickel cobalt aluminate and positive electrode material, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of using a large amount of lye, difficult to control chemical composition, etc., achieving short preparation time and improving electrochemical performance. and cycle stability, environmental protection and economical effects

Active Publication Date: 2021-01-22
浙江格派钴业新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, LiNi m co n Al 1-m-n o 2 The preparation of gradient structure materials is usually by coprecipitation method, which has the disadvantages that the chemical composition of each gradient is not easy to control, and a large amount of lye is required.

Method used

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  • A method for preparing chromium-doped nickel-cobalt lithium aluminate gradient cathode material for lithium batteries

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Effect test

Embodiment 1

[0029] (1) Add lithium acetate, nickel acetate, cobalt acetate, aluminum monoacetate, and chromium acetate into deionized water according to the stoichiometric ratio, stir and heat until completely dissolved, and make mixed solution a, mixed solution b, and mixed solution c; heat The temperature is 69°C; in the mixed solution a, the stoichiometric ratio of lithium acetate, nickel acetate, cobalt acetate, aluminum monoacetate, and chromium acetate satisfies Li:Ni:Co:Al:Cr=1.05:0.8:0.1:0.08:0.02; In mixed solution a, the addition of deionized water is 5 times of the total weight of lithium acetate, nickel acetate, cobalt acetate, monoaluminum acetate, chromium acetate; In mixed solution b, lithium acetate, nickel acetate, cobalt acetate, monoacetic acid The stoichiometric ratio of aluminum and chromium acetate satisfies Li:Ni:Co:Al:Cr=1.05:0.45:0.45:0.07:0.03; in the mixed solution b, the amount of deionized water added is lithium acetate, nickel acetate, cobalt acetate, 5 times...

Embodiment 2

[0035] (1) Add lithium acetate, nickel acetate, cobalt acetate, aluminum monoacetate, and chromium acetate into deionized water according to the stoichiometric ratio, stir and heat until completely dissolved, and make mixed solution a, mixed solution b, and mixed solution c; heat The temperature is 70°C; in the mixed solution a, the stoichiometric ratio of lithium acetate, nickel acetate, cobalt acetate, aluminum monoacetate, and chromium acetate satisfies Li:Ni:Co:Al:Cr=1.05:0.8:0.1:0.08:0.02; In mixed solution a, the addition of deionized water is 5 times of the total weight of lithium acetate, nickel acetate, cobalt acetate, monoaluminum acetate, chromium acetate; In mixed solution b, lithium acetate, nickel acetate, cobalt acetate, monoacetic acid The stoichiometric ratio of aluminum and chromium acetate satisfies Li:Ni:Co:Al:Cr=1.05:0.45:0.45:0.07:0.03; in the mixed solution b, the amount of deionized water added is lithium acetate, nickel acetate, cobalt acetate, 5 times...

Embodiment 3

[0041] (1) Add lithium acetate, nickel acetate, cobalt acetate, aluminum monoacetate, and chromium acetate into deionized water according to the stoichiometric ratio, stir and heat until completely dissolved, and make mixed solution a, mixed solution b, and mixed solution c; heat The temperature is 75°C; in the mixed solution a, the stoichiometric ratio of lithium acetate, nickel acetate, cobalt acetate, aluminum monoacetate, and chromium acetate satisfies Li:Ni:Co:Al:Cr=1.05:0.8:0.1:0.09:0.01; In mixed solution a, the addition of deionized water is 5 times of the total weight of lithium acetate, nickel acetate, cobalt acetate, monoaluminum acetate, chromium acetate; In mixed solution b, lithium acetate, nickel acetate, cobalt acetate, monoacetic acid The stoichiometric ratio of aluminum and chromium acetate satisfies Li:Ni:Co:Al:Cr=1.05:0.45:0.45:0.08:0.02; in the mixed solution b, the amount of deionized water added is lithium acetate, nickel acetate, cobalt acetate, 5 times...

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Abstract

The invention relates to the technical field of lithium battery positive materials, and provides a method for preparing chromium-doped lithium nickel cobalt aluminum oxide gradient positive materialsfor lithium batteries. The method includes preparing a mixed solution a, b and c that a stoichiometric ratio is in gradient change; successively adopting an ultrasonic sprayer to ionize the mixed solutions to inject into a reaction device; forming a three-layer precursor of a gradient structure through layer-by-layer coating and pyrolysis; and preparing a chromium-doped lithium nickel cobalt aluminum oxide gradient positive material through pre-burning, ball milling and sintering. Compared with traditional methods, the method can effectively control the chemical compositions of each gradient the attenuation of battery capacity can be reduced; electrochemical performance and cycle stability can be enhanced; the using of an alkaline solution is not needed; and the method is short in preparation time and good in environmental protection and economy.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium batteries, and provides a method for preparing chromium-doped nickel-cobalt lithium aluminate gradient positive electrode materials for lithium batteries. Background technique [0002] Currently, lithium batteries, as the most common chemical power source, have been widely used in mobile electronic equipment and energy storage devices. Cathode materials are the key materials that determine the performance of lithium batteries. Cathode materials with high energy density, long cycle life and high safety have become research and development hotspots. At present, the lithium battery cathode materials that have been marketed mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, lithium nickel cobalt aluminate (LiNi m co n Al 1-m-n o 2 ), lithium nickel cobalt manganese oxide (LiNi m co n mn 1-m-n o 2 )Wait. Among them, LiNi as a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCY02E60/10
Inventor 曹栋强龚丽锋王红忠方明黄飞中郁丽程罗瑞平龚杰张玉英
Owner 浙江格派钴业新材料有限公司
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