Research Update: Retardation and acceleration of phase separation evaluated from observation of imbalance between structure and valence in LiFePO4/FePO4electrode

Kazuya Tokuda; Tomoya Kawaguchi; Katsutoshi Fukuda; Tetsu Ichitsubo; Eiichiro Matsubara

doi:10.1063/1.4886555

Research Update: Retardation and acceleration of phase separation evaluated from observation of imbalance between structure and valence in LiFePO₄/FePO₄electrode

Kazuya Tokuda, Tomoya Kawaguchi, Katsutoshi Fukuda, Tetsu Ichitsubo, Eiichiro Matsubara

IMR - Materials Development Division

Kyoto University

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

LiFePO₄is a potential positive electrode material for lithium ion batteries. We have experimentally observed an imbalance between the valence change of Fe ions and the structure change from the LiFePO₄phase to the FePO₄phase during delithiation by simultaneous in situ XRD and XANES measurements in an LiFePO₄/FePO₄electrode. The ratio of structure change to valence change clearly indicates that the phase separation from LiFePO₄to FePO₄is suppressed at the beginning of delithiation, while it is accelerated at the latter stage, which is due to the coherent strain caused by the lattice misfit between the two phases.

Original language	English
Article number	070701
Journal	APL Materials
Volume	2
Issue number	7
DOIs	https://doi.org/10.1063/1.4886555
Publication status	Published - 2014 Jul 1

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abstract = "LiFePO4is a potential positive electrode material for lithium ion batteries. We have experimentally observed an imbalance between the valence change of Fe ions and the structure change from the LiFePO4phase to the FePO4phase during delithiation by simultaneous in situ XRD and XANES measurements in an LiFePO4/FePO4electrode. The ratio of structure change to valence change clearly indicates that the phase separation from LiFePO4to FePO4is suppressed at the beginning of delithiation, while it is accelerated at the latter stage, which is due to the coherent strain caused by the lattice misfit between the two phases.",

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AU - Fukuda, Katsutoshi

AU - Ichitsubo, Tetsu

AU - Matsubara, Eiichiro

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AB - LiFePO4is a potential positive electrode material for lithium ion batteries. We have experimentally observed an imbalance between the valence change of Fe ions and the structure change from the LiFePO4phase to the FePO4phase during delithiation by simultaneous in situ XRD and XANES measurements in an LiFePO4/FePO4electrode. The ratio of structure change to valence change clearly indicates that the phase separation from LiFePO4to FePO4is suppressed at the beginning of delithiation, while it is accelerated at the latter stage, which is due to the coherent strain caused by the lattice misfit between the two phases.

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Research Update: Retardation and acceleration of phase separation evaluated from observation of imbalance between structure and valence in LiFePO₄/FePO₄electrode

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