Electrochemical reactivity of ball-milled MoO3-y as anode materials for lithium-ion batteries

Yoon S. Jung, Sangkyoo Lee, Dongjoon Ahn, Anne C. Dillon, Se Hee Lee

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

The electrochemical reactivity of ball-milled MoO3 powders was investigated in Li rechargeable cells. High-energy ball-milling converts highly-crystalline MoO3 bulk powders into partially reduced low-crystalline MoO3-y materials with a reduced particle size. Both bulk and ball-milled MoO3 exhibit a first discharge capacity beyond 1100 mAh g-1 when tested in the 0-3 V (vs. Li/Li+) range, which is indicative of a complete conversion reaction. It is found that partial reduction caused by ball-milling results in a reduction in the conversion reaction. Additionally, incomplete re-oxidation during subsequent charge results in the formation of MoO2 instead of MoO3, which in turn affects the reactivity in subsequent cycles. As compared to bulk MoO3, ball-milled MoO3-y showed significantly enhanced cycle performance (bulk: 27.6% charge capacity retention at the 10th cycle vs. ball-milled for 8 h: 64.4% at the 35th cycle), which can be attributed to the nano-texture wherein nanometer-sized particles aggregate to form secondary ones.

Original languageEnglish
Pages (from-to)286-291
Number of pages6
JournalJournal of Power Sources
Volume188
Issue number1
DOIs
Publication statusPublished - 2009 Mar 1

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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