Direct Observation of Lithium Staging in Partially Delithiated LiFePO4 at Atomic Resolution
Direct Observation of Lithium Staging in Partially Delithiated LiFePO4 at Atomic Resolution
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DOI：
10.1021/ja109412x
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发表时间：
2011-04-06
影响因子：
15
通讯作者：
Ikuhara, Yuichi
中科院分区：
文献类型：
--
作者：
Gu, Lin;Zhu, Changbao;Ikuhara, Yuichi
LiFePO 4中的锂离子通过像差校正的环形亮场扫描透射电子显微镜技术以原子分辨率直接观察。此外，发现在部分脱锂的LiFePO 4中，剩余的锂离子优选地沿着B轴沿着占据每隔一层，类似于在一些层状插层化合物中观察到的分级现象。这一新发现挑战了先前提出的LiFePO 4/FePO 4两相分离机制。
Lithium ions in LiFePO4 were observed directly at atomic resolution by an aberration-corrected annular-bright-field scanning transmission electron microscopy technique. In addition, it was found in partially delithiated LiFePO4 that the remaining lithium ions preferably occupy every second layer, along the b axis, analogously to the staging phenomenon observed in some layered intercalation compounds. This new finding challenges previously proposed LiFePO4/FePO4 two-phase separation mechanisms.