Effect of aluminum fluoride coating on the electrochemical and thermal properties of 0.5Li 2MnO 3·0.5LiNi 0.5Co 0.2Mn 0.3O 2 composite material

Jin Hwa Kim, Min Sik Park, Jun Ho Song, Dong Jin Byun, Young Jun Kim, Jeom Soo Kim

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The positive effect of AlF 3 (Al-F) coating on the over-lithiated transition metal oxide with a composition of 0.5Li 2MnO 3·0.5LiNi 0.5Co 0.2Mn 0.3O 2 has been investigated to address its potential use in lithium ion batteries. On the basis of various structural and electrochemical characterizations, we elucidate a correlation between surface structure and its electrochemical performance. After the controlled coating with AlF 3 (Al-F), we observed notable improvements on cyclic performance and rate capability as well as thermal stability. We found that uniformly introduced AlF 3 (Al-F) not only preserves the electrochemical kinetics at the surface of the oxide but also stabilizes its surface as a protective layer against electrolyte oxidation during the high voltage charging. Such improvements will provide a further progress on the development of high-capacity cathode materials fulfilled with the stringent safety requirements.

Original languageEnglish
Pages (from-to)20-25
Number of pages6
JournalJournal of Alloys and Compounds
Volume517
DOIs
Publication statusPublished - 2012 Mar 15

Keywords

  • Aluminum fluoride
  • Cathode
  • Lithium ion battery
  • Oxide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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