Citation: Zeyu XU, Tongzhou LU, Haibo SHAO, Jianming WANG. Preparation and electrochemical lithium storage performance of porous silicon microsphere composite with metal modification and carbon coating[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(10): 1995-2008. doi: 10.11862/CJIC.20240164 shu

Preparation and electrochemical lithium storage performance of porous silicon microsphere composite with metal modification and carbon coating

Department of Chemistry, Zhejiang University, Hangzhou 310027, China

Corresponding author: Jianming WANG, wjm@zju.edu.cn
Received Date: 4 June 2024
Revised Date: 22 July 2024

Figures(8)

This work adopts a multi-step etching-heat treatment strategy to prepare porous silicon microsphere composite with Sb-Sn surface modification and carbon coating (pSi/Sb-Sn@C), using industrial grade SiAl alloy micro-spheres as a precursor. pSi/Sb-Sn@C had a 3D structure with bimetallic (Sb-Sn) modified porous silicon micro-spheres (pSi/Sb-Sn) as the core and carbon coating as the shell. Carbon shells can improve the electronic conductivity and mechanical stability of porous silicon microspheres, which is beneficial for obtaining a stable solid electrolyte interface (SEI) film. The 3D porous core promotes the diffusion of lithium ions, increases the intercalation/delithiation active sites, and buffers the volume expansion during the intercalation process. The introduction of active metals (Sb-Sn) can improve the conductivity of the composite and contribute to a certain amount of lithium storage capacity. Due to its unique composition and microstructure, pSi/Sb-Sn@C showed a reversible capacity of 1 247.4 mAh·g^-1 after 300 charge/discharge cycles at a current density of 1.0 A·g^-1, demonstrating excellent rate lithium storage performance and enhanced electrochemical cycling stability.
- silicon-based anode,
- porous structure,
- metallic deposition,
- carbon coating,
- electrochemical lithium storage
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