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Preparation method of magnesium oxide coated lithium nickel manganese cobalt cathode material

A technology of nickel cobalt lithium manganate and cathode material, applied in battery electrodes, electrochemical generators, structural parts, etc., can solve the problems of difficulty in obtaining impurity-free materials, reduction in comprehensive electrical properties, and difficulty in drying and removing water. , to achieve good economic benefits and market promotion value, high tap density, and the effect of reducing production steps

Active Publication Date: 2016-02-24
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will inevitably bring about the inhomogeneity of the material, which makes it difficult to obtain materials without impurity phases after sintering, resulting in rapid capacity decay and lower overall electrical properties.
Another method is the sol-gel method, but it is difficult to dry and remove water in this method, which affects its industrialization

Method used

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  • Preparation method of magnesium oxide coated lithium nickel manganese cobalt cathode material
  • Preparation method of magnesium oxide coated lithium nickel manganese cobalt cathode material

Examples

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Embodiment 1

[0029] A method for preparing magnesium oxide-coated nickel-cobalt lithium manganese oxide cathode material, comprising the following steps:

[0030] (1) Mixing of raw materials: Weigh lithium carbonate, nano-spherical nickel-cobalt-manganese hydroxide precursor and sodium polyacrylate accounting for 0.2% of the total mixture mass ratio according to a molar ratio of 1:0.53, and add deionized water to make the slurry Disperse, mix and filter with a solid content of 40% to form a uniform intermediate mixture;

[0031] (2) Primary sintering: put the intermediate mixture obtained in step (1) into a sagger, send it into a pusher kiln for sintering, and produce nickel-cobalt-lithium manganese oxide material. The sintering process is filled with oxygen continuously, and the sintering temperature is 650 ℃, the sintering time is 3h;

[0032] (3) Doping: select nano-scale ZnO, carry out doping treatment to the nickel-cobalt lithium manganate obtained in step (2), and add the nickel-cob...

Embodiment 2

[0036] (1) Mixing of raw materials: Weigh lithium carbonate, nano-spherical nickel-cobalt-manganese hydroxide precursor and sodium polyacrylate accounting for 0.1% of the total mixture mass ratio by molar ratio 1:0.535, and add deionized water to make the slurry Disperse, mix and filter with a solid content of 50% to form a uniform intermediate mixture;

[0037] (2) Primary sintering: put the intermediate mixture obtained in step (1) into a sagger, send it into a pusher kiln for sintering, and produce nickel-cobalt-lithium manganese oxide material. The sintering process is filled with oxygen continuously, and the sintering temperature is 700 ℃, the sintering time is 3h;

[0038] (3) Doping: select nanoscale MgO, carry out doping treatment to the nickel-cobalt lithium manganate obtained in step (2), and add the nickel-cobalt lithium manganate obtained in step (2) to account for 0.5% of the total solid mass In, and add the polyurethane ball that specific gravity is 1.4 as mixin...

Embodiment 3

[0042](1) Mixing of raw materials: Weigh lithium carbonate, nano-spherical nickel-cobalt-manganese hydroxide precursor and potassium polyacrylate accounting for 0.2% of the total mixture mass ratio according to the molar ratio of 1:0.55, and add deionized water to make the slurry The solid content is 60% for dispersion, mixing and filtration to form a uniform intermediate mixture;

[0043] (2) Primary sintering: put the intermediate mixture obtained in step (1) into a sagger, and send it into a pusher kiln for sintering to produce nickel-cobalt-lithium manganate material. The sintering process is filled with oxygen continuously, and the sintering temperature is 750 ℃, the sintering time is 5h;

[0044] (3) Doping: choose nano-scale Al 2 o 3 , the nickel-cobalt lithium manganese oxide gained in step (2) is doped, and added in the nickel-cobalt lithium manganese oxide gained in step (2) to account for 0.2% of the total solid mass, and adding a polyurethane ball with a specific...

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Abstract

The invention belongs to the technical field of battery materials, and discloses a preparation method of a magnesium oxide coated lithium nickel manganese cobalt cathode material. The method comprises the steps of raw material mixing, primary sintering, doping, secondary sintering and coating, wherein the step of raw material mixing comprises the steps that dispersing, even mixing and smashing are conducted on lithium carbonate, a nanometer spherical nickel cobalt manganese hydroxide precursor, polyacrylate and deionized water, and a uniform intermediate mixture is formed. The preparation method of the magnesium oxide coated lithium nickel manganese cobalt cathode material is low in primary sintering temperature, short in sintering time, simple in technology, large in specific capacity and good in cycling performance. The preparation method further has the advantages of being low in investment, reliable in technology, low in operating cost and the like, and the good economic benefit and market promotion value are achieved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a preparation method of a nickel-cobalt lithium manganese oxide positive electrode material, in particular to a preparation method of a magnesium oxide-coated nickel-cobalt lithium manganese oxide positive electrode material. Background technique [0002] Lithium-ion power battery is currently recognized as the most potential vehicle battery at home and abroad. It is mainly composed of positive electrode materials, negative electrode materials, separators, electrolytes, etc. Among them, positive electrode materials are an important part of lithium-ion batteries and also determine the quality of lithium-ion batteries. Therefore, in terms of resources, environmental protection and safety performance, finding the ideal electrode active material for lithium-ion batteries is still the primary problem to be solved by international energy materials workers. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王春飞李华成李普良钟晴卢道焕黄冠汉唐平卢伟胜吴贤图
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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