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Direct observation of lithium staging in partially delithiated LiFePO4 at atomic resolution
Lin Gu1, Changbao Zhu, Hong Li
1WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980 8577, Japan. gu@wpi-aimr.tohoku.ac.jp
Abstract:
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.
