Treatment method of pre-lithiated SiOx negative electrode material

Abstract

The invention relates to a treatment method of a pre-lithiated SiOx negative electrode material. The treatment method of the pre-lithiated SiOx negative electrode material comprises the following steps: mixing the pre-lithiated SiOx negative electrode material with a first solid compound to obtain a first mixture, X being greater than 0 and less than 2, and the first solid compound being selectedfrom at least one of ammonium fluoride and ammonium phosphate; under the atmosphere of protective gas, carrying out heat preservation sintering on the first mixture the temperature of 50 to 300 DEG Cto obtain the first pre-lithium-silicon negative electrode material. According to the treatment method of the pre-lithiated SiOx negative electrode material, the stability of the pre-lithiated SiOx negative electrode material can be improved.

Description

technical field

[0001] The invention relates to the technical field of batteries, in particular to a treatment method for pre-lithiated SiOx negative electrode materials. Background technique

[0002] As people's requirements for the cruising range of electric vehicles are getting higher and higher, the energy density of passenger car battery systems needs to be continuously improved. Traditional graphite anodes can no longer meet the current energy density requirements of power batteries. Due to the high gram capacity of silicon-based anodes, silicon-based anodes have become key research materials.

[0003] Compared with pure Si anode, silicon oxide compound SiO x With higher gram capacity, lower expansion and better cycle life, it is regarded as the next generation of anode materials. However, the traditional silicon oxide compound SiO x There is a problem of low first effect, which seriously restricts its commercial application. At present, there are two main ways to i...

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