在 FePO(4) 微粒电化学嵌锂过程中通过原子级原位成像观察相界迁移。
In situ atomic-scale imaging of phase boundary migration in FePO(4) microparticles during electrochemical lithiation.
机构信息
Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA.
出版信息
Adv Mater. 2013 Oct 11;25(38):5461-6. doi: 10.1002/adma.201301374. Epub 2013 Jul 21.
PMID:23873760
Abstract
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.
摘要
通过原位高分辨率透射电子显微镜（HRTEM）研究了 FePO4 颗粒的电化学嵌锂过程，直接观察到了各向异性嵌锂机制。与之前的事后 HRTEM 观察结果相反，首次观察到 LiFePO4 和 FePO4 之间存在尖锐的（010）相界，该相界在嵌锂过程中沿[010]方向迁移。
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