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Ternary anode material of lithium battery with mesoporous core-shell structure coated on surface and preparation method thereof

A positive electrode material and surface coating technology, which is applied in the field of mesoporous core-shell structure surface coated lithium battery ternary positive electrode materials and its preparation, can solve the problems of capacity drop, easy structure collapse, bulging, etc., to reduce the contact area, The effect of improving material performance and reducing side reactions

Active Publication Date: 2018-11-27
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the secondary particle is formed by the reconstitution of the primary particle, its structure is not as strong as that of the single crystal, and there are defects inside. The structure is easy to collapse under the condition of rapid charge and discharge, and the side reaction with the electrolyte increases, resulting in a decrease in capacity, and even It is bulging, flatulence and other problems, and there is no good solution yet

Method used

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  • Ternary anode material of lithium battery with mesoporous core-shell structure coated on surface and preparation method thereof
  • Ternary anode material of lithium battery with mesoporous core-shell structure coated on surface and preparation method thereof

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preparation example Construction

[0021] A preparation method of a mesoporous core-shell structure surface-coated lithium battery ternary positive electrode material provided by the present invention comprises the following steps:

[0022] Step S1, weighing a certain amount of nickel salt, cobalt salt and manganese salt and mixing with water in a certain molar ratio to obtain a mixed solution, adding ammonia water and sodium hydroxide solution to the mixed solution to adjust the pH to 10-12, controlling the temperature and time, Filtrating, washing, and drying to obtain a nickel-cobalt-manganese ternary precursor;

[0023] Step S2. After mixing the nickel-cobalt-manganese ternary precursor and lithium carbonate according to the metal molar ratio (Li: (Ni+Co+Mn)=1.01-1.05), sintering at a high temperature of 700-900°C, crushing and sieving to obtain nickel Cobalt manganese ternary cathode material;

[0024] Step S3, disperse the obtained nickel-cobalt-manganese ternary positive electrode material in ethanol-wa...

Embodiment 1

[0033] 1) Take a certain amount of nickel salt, cobalt salt and manganese salt and mix with water in a metal molar ratio of 6:2:2 to obtain a mixed solution, add ammonia and sodium hydroxide solution to the mixed solution to adjust the pH until 11, control the temperature and time, filter, wash, and dry to obtain a nickel-cobalt-manganese ternary precursor, mix the nickel-cobalt-manganese ternary precursor with lithium carbonate according to the metal molar ratio Li: (Ni+Co+Mn)=1.02, and mix at a temperature of 750°C sintering, crushing and sieving to obtain nickel-cobalt-manganese ternary positive electrode material, disperse the obtained nickel-cobalt-manganese ternary positive electrode material in ethanol-water solution, slowly add silane coupling agent dropwise to the solution under mechanical stirring, and then dropwise add Adjust the pH to 7 with the lye, keep a certain water temperature and continue stirring, then filter, wash with water, and dry in vacuum to obtain sil...

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Abstract

The invention is suitable for the technical field of lithium batteries and provides a preparation method for a ternary anode material of a lithium battery with a mesoporous core-shell structure coatedon surface. According to the method, a porous core-shell structure is formed by coating SiO2 and Mx(SiO3)y on the surface of a NCM ternary anode material; the anode material is separated from an electrolyte, and meanwhile, ions, such as Al, Zr, W, Co and Ni are coated on the material surface, so that the performance of the anode material is promoted; the nanoscale lithium iron phosphate is absorbed into a mesoporous channel, so that the contact area between the ternary material and the electrolyte is further reduced while the influence of the coating layer on the electron / ion conductivity ofthe material is relieved; after the lithium battery has such a mesoporous core-shell structure, the cycling performance of the lithium battery can be obviously improved, so that the service life of the lithium battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium battery ternary cathode material with a mesoporous core-shell structure surface-coated and a preparation method thereof. Background technique [0002] Coating is one of the most common methods for modifying lithium-ion cathode materials. Coating can not only improve the charge diffusion ability of the cathode material, but also protect the cathode material and improve the stability of the cathode material in the electrolyte, thereby improving Material storage performance, rate performance, safety performance, etc. At present, the common coating materials are oxides, fluorides, and phosphates. Oxide can effectively prevent the reaction between the positive electrode material and the electrolyte, improve the corrosion resistance of the material, and improve the cycle performance of the material; fluoride can inhibit the electrolyte in the electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/624Y02E60/10
Inventor 许开华周子龙徐世国陈玉君张文艳张明龙
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD