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 language | English |
|---|---|
| Pages (from-to) | 5497-5500 |
| Number of pages | 4 |
| Journal | Journal of the American Chemical Society |
| Volume | 135 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - Apr 17 2013 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Direct observation of a metastable crystal phase of LixFePO 4 under electrochemical phase transition
AU - Orikasa, Yuki
AU - Maeda, Takehiro
AU - Koyama, Yukinori
AU - Murayama, Haruno
AU - Fukuda, Katsutoshi
AU - Tanida, Hajime
AU - Arai, Hajime
AU - Matsubara, Eiichiro
AU - Uchimoto, Yoshiharu
AU - Ogumi, Zempachi
PY - 2013/4/17
Y1 - 2013/4/17
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84876473056&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84876473056&partnerID=8YFLogxK
U2 - 10.1021/ja312527x
DO - 10.1021/ja312527x
M3 - Article
C2 - 23544671
AN - SCOPUS:84876473056
VL - 135
SP - 5497
EP - 5500
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 15
ER -