WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980 8577, Japan.
J Am Chem Soc. 2011 Apr 6;133(13):4661-3. doi: 10.1021/ja109412x. Epub 2011 Mar 10.
Lithium ions in LiFePO(4) 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 LiFePO(4) 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 LiFePO(4)/FePO(4) two-phase separation mechanisms.
通过使用具有像差校正的环形明场扫描透射电子显微镜技术，直接在原子分辨率下观察到 LiFePO(4) 中的锂离子。此外，在部分脱锂的 LiFePO(4)中发现，剩余的锂离子优先占据沿 b 轴的每第二层，类似于在一些层状插层化合物中观察到的分层现象。这一新发现挑战了先前提出的 LiFePO(4)/FePO(4)两相分离机制。
