Lithium cobalt oxide material and preparation method thereof as well as anode material

A lithium cobalt oxide and cobalt source technology, which is applied in chemical instruments and methods, battery electrodes, cobalt compounds, etc., can solve the problems of poor rate and cycle performance under high pressure, improve electrical conductivity and processing performance, and expand the scope of application , Improve the effect of magnification

Active Publication Date: 2017-05-31
HUNAN RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The first object of the present invention is to provide a lithium cobalt oxide material, which solves the problem of poor rate and cycle performance of existing materials under high pressure

Method used

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  • Lithium cobalt oxide material and preparation method thereof as well as anode material
  • Lithium cobalt oxide material and preparation method thereof as well as anode material
  • Lithium cobalt oxide material and preparation method thereof as well as anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Make lithium cobalt oxide material, the chemical formula is Li 0.95 co 0.99 Mg 0.01 o 2

[0048] (1) Batching battery-grade cobalt tetroxide, battery-grade lithium nitrate and doping element MgO according to the preset stoichiometric ratio, and then performing sand grinding in a sand mill, adding a certain amount of pure water to the raw material sand grinding, The scope of solid content is 10wt%, will add the stearamide of 0.02wt% (compared with the mass sum of sanding raw materials) in the sanding process, through certain sanding time, the particle size of slurry reaches 0.1~ 0.5μm, stop the sanding, release the sanding slurry into a bucket with stirring (turn on the stirring, so that all parts of the slurry are in a uniform state), and wait for the next step.

[0049] (2) The slurry obtained in the step (1) is subjected to spray granulation to prepare a lithium cobaltate precursor with a spherical small particle size, the particle size is between 2 and 7 μm, and ...

Embodiment 2

[0055] Make lithium cobalt oxide material, the chemical formula is Li a co 1-b m b o 2

[0056] The difference from Example 1 is that the lithium cobalt oxide precursor is heat-treated before coating, and the process is as follows.

[0057] (1) Batching battery-grade cobalt tetroxide, battery-grade lithium nitrate and doping element MgO according to the preset stoichiometric ratio, and then performing sand grinding in a sand mill, adding a certain amount of pure water to the raw material sand grinding, The scope of solid content is 10wt%, will add the stearamide of 0.02wt% (compared with the mass sum of sanding raw materials) in the sanding process, through certain sanding time, the particle size of slurry reaches 0.1~ 0.5μm, stop the sanding, release the sanding slurry into a bucket with stirring (turn on the stirring, so that all parts of the slurry are in a uniform state), and wait for the next step.

[0058] (2) The slurry obtained in the step (1) is subjected to spra...

Embodiment 3-7

[0064] The difference from Example 1 is only that the doping elements and proportions are different, and the molecular formulas of the lithium cobaltate particles are respectively Li 1.15 co 0.997 Al 0.003 o 2 , Li 1.05 co 0.997 Mg 0.001 Al 0.001 Ti 0.001 o 2 , Li 1.1 co 0.99 Mg 0.004 Al 0.004 Ti 0.002 o 2 , Li 1.05 co 0.992 Ni 0.002 mn 0.004 Cr 0.002 o 2 , Li 1.05 co 0.991 Ni 0.003 mn 0.003 Cr 0.003 o 2 , the rest of the formula and process are the same.

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Abstract

The invention provides a lithium cobalt oxide material and a preparation method thereof as well as an anode material. The lithium cobalt oxide material is mainly prepared from an element M doped lithium cobalt oxide particle and a coating which coats the surface of the lithium cobalt oxide particle; the molecular formula of the lithium cobalt oxide particle is LiaCo1-bMbO2, wherein a is not less than 0.95 but not more than 1.15; b is not less than 0.003 but not more than 0.01; M is at least one or several of Mg, Al, Ti, Zr, Ni, Mn, Cr, Mo, W and a rare earth element; the coating is selected from one or a mixture of ZnO and SnO2, and has a weight which is 0.5wt% to 5 wt%, preferably 1wt% to 5wt%, preferably 2wt% to 5wt% and preferably 2wt% to 4wt%, of that of the lithium cobalt oxide particle. By using the lithium cobalt oxide material, the problems that the rate capability and the cycle performance of an existing material are poor under high pressure are solved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a lithium cobaltate material, a preparation method thereof, and a positive electrode material. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, large specific energy, long life, light weight, no memory effect, and environmental protection. They have been widely used in the power supply of various types of equipment. , digital equipment and other fields play an important role. [0003] Cathode materials are an important part of lithium-ion batteries and one of the most important factors affecting the performance of lithium-ion batteries. Research and development of higher-performance cathode materials is an effective way and key to improve the performance of lithium-ion batteries. Lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary are commonly used commercial cathode materials, and layered lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525C01G51/00
CPCC01G51/42C01P2004/01C01P2004/61C01P2006/12C01P2006/40H01M4/366H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 宋振伟李魁周贵海王剑锋公伟伟黄海翔马群刘小雨胡国宏
Owner HUNAN RESHINE NEW MATERIAL
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