Cathode performance and voltage estimation of metal trihalides

Hajime Arai, Shigeto Okada, Yoji Sakurai, Jun Ichi Yamaki

Research output: Contribution to journalArticle

180 Citations (Scopus)

Abstract

Compounds with highly ionic metal-ligand bonds are attractive for use as high voltage cathodes. Therefore, we investigated metal trihalide cathodes, in particular trifluorides (MF3). FeF3 shows a mean discharge voltage and quasi open-circuit voltage (QOCV) of 3.0 and 3.4 V, respectively. X-ray analysis shows that the lithiation reaction proceeds in a topotactic manner. TiF3 and VF3 have mean discharge voltages of 2.5 and 2.2 V, respectively. These three compounds have the same layer structures and almost the same rechargeable capacity of 80 mAh g-1. MnF3, which has a monoclinic lattice, exhibits an initial voltage of 4.2 V, however, lithiation does not proceed due to a high overvoltage. These high voltages indicate the highly ionic nature of MF3 cathodes, and they correspond to values estimated using the standard electrode potentials of the 'naked' ions.

Original languageEnglish
Pages (from-to)716-719
Number of pages4
JournalJournal of Power Sources
Volume68
Issue number2
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

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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