Kilogram‐Scale Fabrication of Si/C Bean‐Structured Materials as Stable Anodes for Li‐Ion Storage

Abstract

The practical application of Si‐based materials is widely impeded by poor electrochemical cycling stability. Here, inspired by the compact cladding and close connection structure of beans, an efficient buffering bean‐structured material of Si/C framework as a stable anode for Li‐ion storage is designed. By a simple ball‐milling process, the kilogram‐scale production of the Si/C can be realized. The Si/C composites exhibit excellent enhancement of electrochemical performance with a large storage capacity (1162.2 mAh g−1 at 0.1 C and 920.6 mAh g−1 at 0.2 C) and superior cycling stability (734 mAh g−1 after 200 cycles). The superior electrochemical performance is from the unique bean‐structured Si/C composites. Some micropores in porous carbon (PC) materials can offer void space that can alleviate stress and reduce volume expansion during the lithiation/delithiation process, and the PC can also act as a conductive matrix to enhance the conductivity and facilitate the diffusion of Li ions and electrons.

The Effect of the Ratio of C45 Carbon to Graphene on the Si/C Composite Materials Used as Anode for Lithium-ion Batteries

“…Alternative methodologies have been developed to address the limitations of simple physical mixing. Yang et al [22] have found that a composite of silicon and graphite synthesized through thermal pyrolysis of polyvinyl chloride dispersed with nanosized silicon and fine graphite particles displays a reversible capacity of approximately 700 mAh g −1 with improved cyclability compared to raw nanocrystalline Si. Additionally, ultrasonication combined with thermal treatment in a reducing atmosphere is another approach that has been explored for synthesizing silicon nanoparticles/graphene composites.…”