Low Voltage Charge/Discharge Behavior of Manganese Hexacyanoferrate
نویسندگان
چکیده
Recently, Prussian blue analogues (PBAs) have been reported to exhibit a low voltage charge/discharge behavior with high capacity (300–545 mAh/g) in lithium-ion secondary batteries (LIBs). To clarify the mechanism of low voltage behavior, we performed ex situ synchrotron radiation X-ray diffraction (XRD) and ex situ X-ray absorption spectroscopy (XAS) of a film of Na1.34Mn[Fe(CN)6]0.84·3.4H2O without air exposure. After the 1st discharge process, the XRD patterns and X-ray absorption spectra around the Fe and Mn K edges reveal formation of Fe and Mn metals. After the charge process, the XRD pattern reveals formation of Fe2O3. Based on these observations, we ascribed the low voltage behavior mainly to the conversion reaction of Fe2O3: 6e− + Fe2O3 + 6Li+ ⇀↽ 2Fe +3Li2O.
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