LiFeO 2-incorporated Li 2MoO 3 as a cathode additive for lithium-ion battery safety

Kyu Sung Park, Dongmin Im, Anass Benayad, Anthony Dylla, Keith J. Stevenson, John B. Goodenough

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

Li 2MoO 3, with a Mo(IV)/Mo(VI) redox couple, has been tested as a cathode additive to make lithium-ion batteries safe under abnormal discharge conditions. Its high charging capacity and sloping discharge voltage below 3.4 V vs Li +/Li effectively prevents the Cu anode current collector from oxidative dissolution at the overdischarge condition. However, molybdenum dissolution from the electrochemically charged Li 2MoO 3 quickly deteriorates the battery performance at 45 °C. A solid solution of Li 2MoO 3 with LiFeO 2 has stabilized the crystalline structure at the charged states and suppressed the Mo(VI) dissolution. The addition of 10 wt % 0.9Li 2MoO 3-0. 1LiFeO 2 to LiCoO 2 electrode enables long-term, high-temperature cycling in the operating voltage range of 0.0-4.3 V vs graphite.

Original languageEnglish
Pages (from-to)2673-2683
Number of pages11
JournalChemistry of Materials
Volume24
Issue number14
DOIs
Publication statusPublished - 24 Jul 2012
Externally publishedYes

Keywords

  • Li2MoO3
  • LiFeO2
  • lithium-ion battery
  • Mo dissolution
  • overdischarge

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