Electrochemical properties of titanium fluoride with high rate capability for lithium-ion batteries

Ayuko Kitajou, Katsuya Eguchi, Yuji Ishado, Hiroyuki Setoyama, Toshihiro Okajima, Shigeto Okada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

As a conversion-type active material, we investigated the electrochemical properties and the discharge-charge reaction mechanisms of a TiF3 having the same symmetry as FeF3. First, the insertion reaction of TiF3 proceeded at an average voltage of 2.0 V. Once the voltage of the conversion reaction declined to 0.5 V, the generated metallic Ti was indexed to a cubic system with the Im-3m space group, which is different from the stable structure of metallic Ti with the P63/mmc space group. Moreover, upon recharging to 4.0 V after the conversion reaction, the structure had an amorphous phase of LixTiF3. It is known that, on the first discharge, FeF3 first shows a reversible insertion reaction with 1 Li and then a conversion reaction with the other 2 Li. These results demonstrated that TiF3 had the following overall discharge-charge reaction, which was distinct from that of FeF3: TiF3 + 3Li → 3LiF + Ti ⇄ (3-x)Li+ + LixTiF3 (amorphous phase).

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalJournal of Power Sources
Volume419
DOIs
Publication statusPublished - Apr 15 2019

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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