Carbon composites of open-framework iron fluoride (FeF3·0.33H2O/C) was investigated as a new cathode material for calcium ion batteries for the first time. FeF3·0.33H2O/C delivers a relatively large capacity of ca. 110mAhg-1. Its reversible capacity was greatly improved over non-composite FeF3·0.33H2O. During the first discharge and discharge-charge, insertion/extraction of Ca2+ into/from FeF3·0.33H2O/C were confirmed by an ex-situ X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX) analysis. From the ex-situ analysis results, it was confirmed that Ca2+ was inserted and extracted with redox of Fe.

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