Direct observation of a metastable crystal phase of LixFePO 4 under electrochemical phase transition

Yuki Orikasa, Takehiro Maeda, Yukinori Koyama, Haruno Murayama, Katsutoshi Fukuda, Hajime Tanida, Hajime Arai, Eiichiro Matsubara, Yoshiharu Uchimoto, Zempachi Ogumi

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

The phase transition between LiFePO4 and FePO4 during nonequilibrium battery operation was tracked in real time using time-resolved X-ray diffraction. In conjunction with increasing current density, a metastable crystal phase appears in addition to the thermodynamically stable LiFePO 4 and FePO4 phases. The metastable phase gradually diminishes under open-circuit conditions following electrochemical cycling. We propose a phase transition path that passes through the metastable phase and posit the new phase's role in decreasing the nucleation energy, accounting for the excellent rate capability of LiFePO4. This study is the first to report the measurement of a metastable crystal phase during the electrochemical phase transition of LixFePO4.

Original languageEnglish
Pages (from-to)5497-5500
Number of pages4
JournalJournal of the American Chemical Society
Volume135
Issue number15
DOIs
Publication statusPublished - Apr 17 2013
Externally publishedYes

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Phase Transition
Metastable phases
Phase transitions
Observation
Crystals
X-Ray Diffraction
Nucleation
Current density
X ray diffraction
Networks (circuits)
LiFePO4
ferric phosphate

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Direct observation of a metastable crystal phase of LixFePO 4 under electrochemical phase transition. / Orikasa, Yuki; Maeda, Takehiro; Koyama, Yukinori; Murayama, Haruno; Fukuda, Katsutoshi; Tanida, Hajime; Arai, Hajime; Matsubara, Eiichiro; Uchimoto, Yoshiharu; Ogumi, Zempachi.

In: Journal of the American Chemical Society, Vol. 135, No. 15, 17.04.2013, p. 5497-5500.

Research output: Contribution to journalArticle

Orikasa, Y, Maeda, T, Koyama, Y, Murayama, H, Fukuda, K, Tanida, H, Arai, H, Matsubara, E, Uchimoto, Y & Ogumi, Z 2013, 'Direct observation of a metastable crystal phase of LixFePO 4 under electrochemical phase transition', Journal of the American Chemical Society, vol. 135, no. 15, pp. 5497-5500. https://doi.org/10.1021/ja312527x
Orikasa, Yuki ; Maeda, Takehiro ; Koyama, Yukinori ; Murayama, Haruno ; Fukuda, Katsutoshi ; Tanida, Hajime ; Arai, Hajime ; Matsubara, Eiichiro ; Uchimoto, Yoshiharu ; Ogumi, Zempachi. / Direct observation of a metastable crystal phase of LixFePO 4 under electrochemical phase transition. In: Journal of the American Chemical Society. 2013 ; Vol. 135, No. 15. pp. 5497-5500.
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AU - Fukuda, Katsutoshi

AU - Tanida, Hajime

AU - Arai, Hajime

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