The crystal structures of FeAs and LiFeAs. Li ion in LiFeAs is 5-coordinate (square-based pyramid) by As.
The specific capacity in the first 20 cycles. Inset: sketch of LiFeAs cell. (1) cover lid, (2) container, (3) electrolyte separator, (4) spacing ring, (5) spacing ring, (6) cylinder, (7) Cu foil with FeAs film, and (8) lithium film.
The cell voltage vs specific capacity in the first ten cycles. The discharge and charge curves correspond to Li-inserting and Li-removing processes, respectively.
dc magnetic susceptibility of the anode film under initial charging in both zero-field-cooled and field-cooled procedures under .
Morphology of FeAs materials on discharged anode (a) one cycle, (b) three cycles, and (c) ten cycles.
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