Abstract：
:Charge/discharge of lithium-ion battery cathode material LiFePO4 is mediated by the structure and properties of the interface between delithiated and lithiated phases. Direct observations of the interface in a partially delithiated single crystal as a function of time using scanning transmission electron microscopy and electron energy-loss spectroscopy help clarify these complex phenomena. At the nano-scale, the interface comprises a thin multiphase layer whose composition varies monotonically between those of the two end-member phases. After partial delithiation, the interface does not remain static, but changes gradually in terms of orientation, morphology and position, as Li ions from the crystal bulk diffuse back into the delithiated regions. First-principles calculations of a monoclinic crystal of composition Li2/3FePO4 suggest that the interface exhibits higher electronic conductivity than either of the end-member phases. These observations highlight the importance of the interface in enabling LiFePO4 particles to retain structural integrity during high-rate charging and discharging.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Kobayashi S,Kuwabara A,Fisher CAJ,Ukyo Y,Ikuhara Ydoi
10.1038/s41467-018-05241-1subject
Has Abstractpub_date
2018-07-20 00:00:00pages
2863issue
1issn
2041-1723pii
10.1038/s41467-018-05241-1journal_volume
9pub_type
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