Silicon anode material with spherical thorn-like structure and preparation method thereof

Abstract

The invention belongs to the technical field of lithium ion battery electrode materials and its preparation, and discloses a silicon negative electrode material with a spherical thorn-like structure and a preparation method thereof, belonging to the technical field of lithium ion battery electrode materials and its preparation. The silicon source compound, the hydrolyzing agent, the reducing agent and the surfactant are added to the inert solvent, the above-mentioned suspension is transferred to the closed reaction kettle, and the silicon-oxygen material precursor is prepared by the hydrothermal method; The silicon oxide compound is coated with conductive carbon by the deposition method, and finally cooled to obtain a silicon anode material with a spherical thorn-like structure, the chemical formula of which is SiO x / C, where 0

Description

technical field

[0001] The invention belongs to the technical field of lithium ion battery electrode materials and preparation thereof, and particularly provides a silicon anode material and a preparation method thereof. Background technique

[0002] With the continuous improvement of the battery life requirements of new energy vehicles, the energy density requirements of lithium-ion batteries as power sources are also rising. At present, improving the energy density of lithium-ion batteries in the industry mainly focuses on the development of high-nickel ternary cathode materials and high-capacity silicon anode materials. The theoretical gram capacity of silicon material can reach 4200mAh / g. Compared with the traditional graphite negative electrode material (372mAh / g), it has obvious gram capacity advantage, and the earth reserves of silicon element are high, and it has become a hot spot in the development of negative electrode materials in the industry.

[0003] However, ...

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