Thermoelectrochemically activated MoO2 powder electrode for lithium secondary batteries

Jun H. Ku, Yoon S. Jung, Kyu T. Lee, Chang H. Kim, Seung M. Oh

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

The high temperature lithiation behavior of the MoO2 electrode is examined, which is lithiated by one-electron reduction (by addition reaction) at room temperature. At elevated temperatures, this electrode is lithiated with four-electron reduction by addition and continued conversion reaction. As a result of four-electron reduction, the initial crystalline MoO2 phase is decomposed into a nanosized mixture of metallic Mo and Li2 O, which is in turn converted to nanosized MoO2 upon forthcoming delithiation. An interesting feature here is that as-generated nanosized MoO2 is now fully lithiated up to four-electron reduction even at room temperature. This phenomenon is named "thermoelectrochemical activation" because the extension from one- to four-electron reduction is achieved by a simple charge-discharge cycling made at elevated temperatures. The thermoelectrochemically activated MoO2 electrode delivers a reversible specific capacity that is close to the theoretical four-electron capacity (838 mAh g-1) with an excellent cycle performance at room temperature.

Original languageEnglish
Pages (from-to)A688-A693
JournalJournal of the Electrochemical Society
Volume156
Issue number8
DOIs
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Thermoelectrochemically activated MoO<sub>2</sub> powder electrode for lithium secondary batteries'. Together they form a unique fingerprint.

  • Cite this