High-energy silicon-carbon composite negative electrode material for lithium ion battery and preparation process of high-energy silicon-carbon composite negative electrode material

By mixing phenolic resin-based activated carbon and biomass activated carbon as porous carbon matrix, combined with fluidized bed and rotary furnace processes, a double-layer carbon-covered structure is formed, which solves the volume expansion and conductivity of the silicon-based negative electrode material, and improves the cycle stability and conductivity of lithium-ion batteries.

CN120348941AInactive Publication Date: 2025-07-22BAZHONG CARBON NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202510847450.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-24
Publication Date
2025-07-22
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The crack problems caused by volume expansion and the need for improved conductivity in lithium-ion batteries have not been effectively solved.

Method used

The mixture of phenolic resin-based activated carbon and biomass activated carbon is used as porous carbon matrix, combined with fluidized bed chemical vapor deposition and rotary furnace secondary carbon coating process, a double-layer functionalized carbon coating structure is formed, and carbon nanotubes are added as conductive agents to optimize the pore structure and mechanical strength.

Benefits of technology

The cyclic stability and conductivity of silicon-carbon composite anode material for lithium-ion batteries is improved, the stress generated by volume expansion is alleviated, the electron transmission capacity is enhanced, and the electrochemical performance is improved.

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Abstract

The invention relates to the field of lithium battery negative electrode materials, and particularly discloses a high-energy silicon-carbon composite negative electrode material for a lithium ion battery and a preparation process of the high-energy silicon-carbon composite negative electrode material. The preparation method comprises the following steps: mixing resin-based activated carbon and biomass activated carbon with specific pore volume and compressive strength according to a mass ratio of 1: (0.2-0.3) to obtain a porous carbon matrix; depositing silicon nanoparticles on the porous carbon substrate by adopting a fluidized bed chemical vapor deposition process; depositing a thin carbon layer on the surface of the silicon-carbon core material by taking acetylene as a carbon source; and carrying out secondary carbon coating by adopting a rotary furnace to form the silicon-carbon negative electrode material. According to the composite negative electrode material prepared by the process, the resin-based activated carbon is used as a main matrix, so that the influence of more impurities and non-uniform pore structure distribution of biomass activated carbon on the cycling stability and conductivity of the silicon-carbon negative electrode material is reduced, and the problems of volume expansion and conductivity of the silicon-based negative electrode material are solved.
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