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Yujie Zhu, Jiang Wei Wang, Yang Liu, Xiaohua Liu, Akihiro Kushima, Yihang Liu, Yunhua Xu, Scott X. Mao, Ju Li, Chunsheng Wang and Jian Yu Huang In Situ Atomic-Scale Imaging of Phase Boundary Migration in FePO4 Microparticles During Electrochemical Lithiation Advanced Materials 25

Article first published online: 21 JUL 2013 | DOI: 10.1002/adma.201301374

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The electrochemical lithiation of FePO4 particles is investigated by in situ high-resolution transmission electron microscopy (HRTEM), and the anisotropic lithiation mechanism is directly observed. For the first time and in contrast to the previous post mortem HRTEM observations, a sharp (010) phase boundary between LiFePO4 and FePO4 is observed, which migrates along the [010] direction during lithiation.

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