Improvement in Si active material particle performance for lithium-ion batteries by surface modification of an inductivity coupled plasma-chemical vapor deposition

Norihiro Shimoi, Yasumitsu Tanaka

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The high capacity and optimal cycle characteristics of silicon render it essential in lithium-ion batteries. The authors have attempted to realize a composite material by coating individual silicon (Si) particles of a few micrometers in diameter with a silicon oxide film to serve as an active material in the anode and so optimize the charge-discharge characteristics of the lithium-ion battery. Particle coating was achieved using an inductively coupled plasma-chemical vapor deposition (ICP-CVD) process that realized a homogenous coating of silicon oxide film on each Si particle. The film was synthesized based on tetraethyl orthosilicate (TEOS), with hydrogen (H 2) gas used as a reducing agent to deoxidize the silicon dioxide. This enabled the control of the silicon oxidation number in the layers produced by adjusting the H 2 flow during the silicon oxidization deposition with ICP-CVD. The silicon oxide covering the Si particles included both silicon monoxide and suboxide, which served to optimize the charge-discharge characteristics. The authors have succeeded in realizing a favorable active material using Si which is abundant in nature in the anode of a lithium-ion battery with highly charged, optimized cycle properties.

Original languageEnglish
Pages (from-to)227-232
Number of pages6
JournalElectrochimica Acta
Volume80
DOIs
Publication statusPublished - 2012 Oct 1

Keywords

  • ICP-CVD
  • Lithium-ion battery
  • Si particle
  • Silicon oxidation number

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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