Research Update: Retardation and acceleration of phase separation evaluated from observation of imbalance between structure and valence in LiFePO4/FePO4 electrode | Zendy

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

Open Access

Research Update: Retardation and acceleration of phase separation evaluated from observation of imbalance between structure and valence in LiFePO4/FePO4 electrode

Author(s) -

Kazuya Tokuda,

Tomoya Kawaguchi,

Katsutoshi Fukuda,

Tetsu Ichitsubo,

Eiichiro Matsubara

Publication year - 2014

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4886555

Subject(s) - valence (chemistry) , materials science , electrode , xanes , ion , chemical physics , analytical chemistry (journal) , phase (matter) , lithium (medication) , lattice (music) , condensed matter physics , chemistry , spectroscopy , physics , organic chemistry , chromatography , quantum mechanics , medicine , acoustics , endocrinology

LiFePO4 is 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 LiFePO4 phase to the FePO4 phase during delithiation by simultaneous in situ XRD and XANES measurements in an LiFePO4/FePO4 electrode. The ratio of structure change to valence change clearly indicates that the phase separation from LiFePO4 to FePO4 is 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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