4.8 Article

Direct Observation of Lithium Staging in Partially Delithiated LiFePO4 at Atomic Resolution

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 13, Pages 4661-4663

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ja109412x

Keywords

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Funding

  1. Japan Society for the Promotion of Science (JSPS) [22760506]
  2. Chinese Academy of Sciences
  3. 863 Project [2009AA033101]
  4. Grants-in-Aid for Scientific Research [19053001, 22760506, 19053003] Funding Source: KAKEN

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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.

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