Preparation method for zinc oxide-coated lithium nickel manganese cobalt positive electrode material

A technology of nickel-cobalt-lithium-manganese-manganate and cathode materials, which is applied in nanotechnology for materials and surface science, battery electrodes, electrochemical generators, etc., can solve the problems of difficult to obtain materials without impurity phases, lower comprehensive electrical properties, Problems such as material inhomogeneity, to achieve good economic benefits and marketing value, improve quality, and lower operating costs

Inactive Publication Date: 2016-04-13
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 for zinc oxide-coated lithium nickel manganese cobalt positive electrode material
  • Preparation method for zinc oxide-coated lithium nickel manganese cobalt positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0028] A preparation method for zinc oxide-coated nickel-cobalt lithium manganese oxide cathode material, comprising the following steps:

[0029] (1) Mixing of raw materials: Using a three-dimensional high-efficiency oblique mixer and using zirconium balls as the mixing medium, weigh lithium carbonate, nano-spherical nickel-cobalt-manganese hydroxide precursor and the mass ratio of the total mixture according to the molar ratio of 1:0.53 10% polyethylene glycol is dispersed, mixed and pulverized to form a uniform intermediate mixture, wherein the addition of zirconium balls is 1.0 times the total mass of the mixture;

[0030] (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;

[0031] (3) Doping: select nano-scale Zn...

Embodiment 2

[0036] (1) Mixing of raw materials: Using a three-dimensional high-efficiency oblique mixer and using zirconium balls as the mixing medium, weigh lithium carbonate, nano-spherical nickel-cobalt-manganese hydroxide precursor and the mass ratio of the total mixture according to the molar ratio of 1:0.54 20% polyethylene glycol is dispersed, mixed and pulverized to form a uniform intermediate mixture, wherein the addition of zirconium balls is 1.2 times the total mass of the 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 nano-scale MgO to carry out doping treatment to the nickel-cobalt lithium manganate obtained in step (2), add in the nickel-cobalt lithium manganate obtai...

Embodiment 3

[0043] (1) Mixing of raw materials: Using a three-dimensional high-efficiency oblique mixer and using zirconium balls as the mixing medium, weigh lithium carbonate, nano-spherical nickel-cobalt-manganese hydroxide precursor and the mass ratio of the total mixture according to the molar ratio of 1:0.55 30% polyethylene glycol is dispersed, mixed and pulverized to form a uniform intermediate mixture, wherein the addition of zirconium balls is 1.3 times the total mass of the mixture;

[0044] (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;

[0045] (3) Doping: choose nano-scale Al 2 o 3 Doping the lithium nickel cobalt manganese oxide obtained in step (2), adding 0.2% of the total solid mass to the lithium nickel cobalt ...

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Abstract

The invention belongs to the technical field of a battery material, and discloses a preparation method for a zinc oxide-coated lithium nickel manganese cobalt positive electrode material. The preparation method comprises the steps of mixing raw materials, primary sintering, doping, secondary sintering, coating, and performing granulation, wherein the step of mixing raw materials is carried out by the steps of adopting a three-dimensional efficient inclined type mixer, taking zirconium balls as the material-mixing medium, and performing dispersion, uniform mixing and smashing on lithium carbonate, a nanosphere-shaped nickel manganese cobalt hydroxide precursor and polyethylene glycol to form uniform intermediate mixture. The preparation method for the zinc oxide-coated lithium nickel manganese cobalt positive electrode material is low in primary sintering temperature, short in sintering time, simple in process, high in specific capacity, and good in cycling performance; and the preparation method also has the advantages of low investment, reliable technology, low operating cost, high economic benefits, high market popularization value and the like.

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 zinc 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, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 钟晴明宪权李华成张丽云李运姣李春霞农政东胡明超苏琳圆
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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