Transient phase change in two phase reaction between LiFePO4 and FePO4 under battery operation

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

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)

Abstract

Transient states of phase transition in LiFePO4/FePO4 for lithium ion battery positive electrodes are investigated by time-resolved measurements. To directly detect changes in electronic and crystal structures under battery operation, in situ time-resolved X-ray absorption and diffraction measurements are performed, respectively. The phase fraction change estimated by the iron valence change is similar to the electrochemically expected change. The transient change of lattice constant during two phase reaction is clearly observed by the time-resolved X-ray diffraction measurement. The nonequilibrium lithium extraction behavior deviates from the thermodynamic diagram of the two phase system, resulting in continuous phase transition during electrochemical reactions.

Original languageEnglish
Pages (from-to)1032-1039
Number of pages8
JournalChemistry of Materials
Volume25
Issue number7
DOIs
Publication statusPublished - Apr 9 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Transient phase change in two phase reaction between LiFePO<sub>4</sub> and FePO<sub>4</sub> under battery operation'. Together they form a unique fingerprint.

Cite this