Preparing method for spherical LiMn1-x-yNixCoyO2 anode material

A technology of nickel cobalt lithium manganate and positive electrode material, which is applied to battery electrodes, structural parts, electrical components, etc., can solve the problems of difficulty in obtaining impurity-free materials, reduction in comprehensive electrical properties, and difficulty in drying and dewatering. The effect of improving electrochemical cycle performance, improving quality, and reducing production steps

Inactive Publication Date: 2016-02-24
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • 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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  • Preparing method for spherical LiMn1-x-yNixCoyO2 anode material
  • Preparing method for spherical LiMn1-x-yNixCoyO2 anode material
  • Preparing method for spherical LiMn1-x-yNixCoyO2 anode material

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Embodiment 1

[0028] A preparation method of a spherical nickel-cobalt lithium manganese oxide positive electrode material, comprising the following steps:

[0029] (1) Mixing of raw materials: Using a three-dimensional high-efficiency oblique mixer and polyurethane 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 Disperse, mix and pulverize 10% polyvinyl alcohol to form a uniform intermediate mixture, in which the proportion of polyurethane balls is 1.3, the ratio of balls to materials is 3:4:3, and the mixing time is 3 hours;

[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;

[00...

Embodiment 2

[0035] (1) Mixing of raw materials: Using a three-dimensional high-efficiency inclined mixer and polyurethane balls as the mixing medium, weigh lithium carbonate, nano-spherical nickel-cobalt-manganese hydroxide precursors and the mass ratio of the total mixture according to the molar ratio of 1:0.535 Disperse, mix and pulverize 20% polyvinyl alcohol to form a uniform intermediate mixture, wherein the specific gravity of polyurethane balls is 1.5, the ball-to-material ratio is 3:4:3, and the mixing time is 3 hours;

[0036] (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;

[0037] (3) Doping: choose nano Al 2 o 3 The nickel-cobalt lithium manganese oxide obtained in step (2) is doped, and is added to the nickel-cob...

Embodiment 3

[0041] (1) Mixing of raw materials: Using a three-dimensional high-efficiency oblique mixer and polyurethane balls as the mixing medium, weigh lithium carbonate, nano-spherical nickel-cobalt-manganese hydroxide precursors and 30% additives for dispersion at a molar ratio of 1:0.55 , mixing and crushing to form a uniform intermediate mixture, wherein the proportion of polyurethane balls is 1.4, the ball-to-material ratio is 3:4:3, and the mixing time is 4h;

[0042](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;

[0043] (3) Doping: choose nano TiO 2 The nickel-cobalt lithium manganese oxide obtained in step (2) is doped, and is added to the nickel-cobalt lithium manganese oxide obtained in step (2) at 0.2% of the total...

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Abstract

The invention belongs to the technical field of battery materials and discloses a preparing method for a spherical LiMn1-x-yNixCoyO2 anode material. The method comprises the steps of raw material mixing, primary sintering, doping, secondary sintering and whole particle treating. A three-dimensional efficient oblique mixing machine is adopted for raw material mixing, a polyurethane sphere is adopted as a mixed material medium, and lithium carbonate, a nanometer spherical Ni-Co-Mn hydroxide precursor and polyvinyl alcohol are dispersed, mixed uniformly and smashed to form a uniform intermediate mixture. According to the preparing method for the spherical LiMn1-x-yNixCoyO2 anode material, the temperature for primary sintering is low, sintering time is short, the process is simple, the specific capacity is high, and cycling performance is good. The preparing method has the advantages of being small in investment, reliable in technology, low in operation expense and the like, and has good economic benefits and market popularization value.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a preparation method of a positive electrode material of nickel-cobalt lithium manganese oxide, in particular to a preparation method of a spherical 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 positi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 钟晴李运姣李华成陈南雄黄冠汉明宪权张丽云曾文明黎兆明
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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