Optimization of heat treatment conditions for fabricating pre-lithiated silicon monoxide as an anode material for lithium-ion batteries

Jee Ho Yom, Il Won Seong, Sung Man Cho, Woo Young Yoon

Research output: Contribution to journalArticle

Abstract

Herein, we compared the galvanostat- and thermal-driven electrochemical reactions occurring in lithiated silicon monoxide and found that the kinetics of the initial irreversible formation of certain phases (galvanostat-electrochemical reaction) do not agree with those of the pre-lithiation reaction between silicon monoxide and lithium metal (thermal-driven electrochemical reaction). However, thermal-driven electrochemical reactions occurring at high temperatures yielded phases similar to those formed galvanostatically, thereby reducing the initial irreversibility of cell. The kinetics of pre-lithiation were investigated by heating a silicon monoxide/lithium powder mixture to 600C at heating rates of 9C min–1 and 14C min–1. Lithium oxide and lithium metasilicate were formed in both cases, while lithium silicate was formed only when the heating rate was 14C min–1. The identities of these irreversibly formed products were determined by XRD, DTA and the effect of heating rate was elucidated by electrochemical tests. Pre-lithiated samples heated at rates of 9C min–1 and 14C min–1 exhibited initial coulombic efficiencies of 78.83% and 81.72%, respectively. These values are higher than those observed for bare silicon monoxide anodes, thus indicating that heating conditions influence the irreversible formation of the above mentioned phases and affect the irreversible capacity of silicon monoxide.

Original languageEnglish
Pages (from-to)A603-A608
JournalJournal of the Electrochemical Society
Volume165
Issue number3
DOIs
Publication statusPublished - 2018 Jan

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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