Effect of Methane Injection Methods on the Preparation of Silicon Nanoparticles with Carbon Coating in Induction Thermal Plasma

Xiaoyu Zhang, Kentaro Yamano, Ririko Hayashida, Manabu Tanaka, Takayuki Watanabe

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Induction thermal plasma was applied to prepare carbon coated silicon nanoparticles as the anode materials of a battery. The effect of methane injection methods was investigated. Silicon nanoparticles were fabricated as main products and showed spherical morphologies with an average diameter of around 50 nm. The unfavorable formation of SiC, which is a byproduct and limits the practical capacity of batteries, could be identified when the methane injection position is near to plasma torch. An amorphous hydrogenated carbon coating was synthesized instead of pure carbon materials. The methane injection position could determine the decomposition temperature of methane as well as the concentration of released H atoms. The properties of prepared carbon coatings, including the sp2 ratio and H content, were tunable with injection positions through the etching effect of hydrogen atoms. These results are significant for the synthesis of silicon nanoparticles with carbon coating and the design of lithium-ion batteries with higher energy density.

Original languageEnglish
Pages (from-to)22-28
Number of pages7
JournalJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume55
Issue number1
DOIs
Publication statusPublished - Jan 20 2022

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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