Negative electrode material comprising nano-silicon loaded on porous carbon, and preparation method therefor

WO2026060860A1PCT designated stage Publication Date: 2026-03-26GANZHOU RUIFUTE TECHNOLOGY CO LTD +1
View PDF 7 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2026-03-26

AI Technical Summary

Technical Problem

The silicon-based materials used in existing lithium-ion battery anodes have high charge-discharge expansion rates, resulting in poor cycle stability, easy pulverization and breakage, which affects battery performance.

Method used

Surface-modified nano-silicon and carbon nanotube/thin-layer graphite composites are mixed with a precursor solution and spray-dried to form a porous carbon shell. This is then combined with high-temperature sintering to form a dense carbon shell, creating a high-speed conductive network that buffers volume expansion.

Benefits of technology

It improves the cycle stability and rate performance of the negative electrode material, reduces electrochemical impedance, and enhances the electrochemical performance of the battery during charge and discharge.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN2024142716_26032026_PF_FP_ABST
    Figure CN2024142716_26032026_PF_FP_ABST
Patent Text Reader

Abstract

The present invention relates to the technical field of lithium ion battery materials, and provides a negative electrode material comprising nano-silicon loaded on porous carbon, and a preparation method therefor. The preparation method comprises the following steps: surface modification of nano-silicon; surface modification of carbon nanotubes and few-layer graphite; preparation of precursor-encapsulated composite microspheres; and preparation of the negative electrode material. In the present invention, when a precursor is dissolved, a surface-modified nano-silicon dispersion and a composite dispersion are added, and high-temperature spray drying is performed to prepare precursor-encapsulated composite microspheres; since the precursor undergoes weight loss due to decomposition of a large number of groups at a high temperature to form a porous loose structure, the volume expansion of silicon can be well buffered; then the precursor-encapsulated microspheres are uniformly dispersed in a prepolymer composition, and after standing polymerization to obtain a gel, vacuum drying, and sintering, a dense high-strength carbon shell is formed on the surface of the loose carbon layer, thereby preventing expansion and damage of the negative electrode material, and improving the cycle stability and rate performance of the negative electrode material.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Silicon-carbon composite anode material, preparation method thereof and lithium ion battery

    CN104103807A

  • High-energy-density and high-power-density negative electrode material for lithium ion battery and preparation method

    CN109755522A

  • Method for preparing anode material, anode material, anode pole piece and lithium ion battery

    CN109860528A

  • Sodium-ion battery graphene-like ultrathin nanometer negative electrode material, and preparation method and application thereof

    CN117936756A

  • Porous silicon-carbon composite negative electrode material and preparation method thereof

    CN118335960A