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. 2011 Apr 6;133(13):4661-3.
doi: 10.1021/ja109412x. Epub 2011 Mar 10.

Direct observation of lithium staging in partially delithiated LiFePO4 at atomic resolution

Lin Gu  1 , Changbao Zhu, Hong Li, Yan Yu, Chilin Li, Susumu Tsukimoto, Joachim Maier, Yuichi Ikuhara
Affiliations

Direct observation of lithium staging in partially delithiated LiFePO4 at atomic resolution

Lin Gu et al. J Am Chem Soc. .

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.

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