Scalable Synthesis of High-performance Anode Material SiOx/C for Lithium-ion Batteries by Employing the Rochow Reaction Process

Xingyue Gao, Yuan Gao, Qiongguang Li, Yanhong Wang*, Dawei Zhao*, Guangwen Xu, Ziyi Zhong, Fabing Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The commercial application of silicon oxide (SiOx)-based anode materials in lithium-ion batteries (LIBs) is hindered by their poor electrochemical performance and difficulty in large-scale production. Here, we report a scalable synthesis of a carbon-coated SiOx composite (SiOx/C) as an excellent and stable anode material for LIBs. By employing the industrial Rochow reaction process, metallurgic grade Si microparticles first reacted with gaseous CH3OH over a Cu-based catalyst to generate alkoxysilanes (important organosilane monomers) and SiOx particles covered with organic compounds. After separation and washing, the obtained SiOx solid particles were carbonized to generate the SiOx/C composite. The prepared SiOx/C composite used as the anode material in LIBs could deliver a high reversible capacity of 581 mAh g-1 at a higher current density of 100 mA g-1 after 100 cycles and 510 mAh g-1 after 250 cycles even at a higher current density of 500 mA g-1. It is anticipated that by employing an industrial process for alkoxysilane synthesis with controlled reaction conditions, the large-scale preparation of a SiOx/C anode material becomes highly feasible.
Original languageEnglish
JournalJournal of Alloys and Compounds
DOIs
StateE-pub ahead of print - 7 Jan 2022

Keywords

  • SiOx/C composite
  • scalable synthesis
  • Rochow reaction
  • anode
  • lithium-ion batteries

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