Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 14, Pages 6393-6398Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta00484b
Keywords
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Funding
- National Natural Science Foundation of China [1430104]
- National Key Scientific Research Project [2016YFB0901504]
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A high-quality sized FeFe(CN)(6) was synthesized as a cathode material for a non-aqueous potassium-ion battery. The electrode delivered a reversible capacity of 124 mA h g(-1) at the current rate of 0.5C and still retained a reversible capacity of 93 mA h g(-1) after 500 cycles at 5C with a columbic efficiency of 100%. Structural evolution and redox couples of lowand high spin Fe-III/Fe-II were investigated by ex situ X-ray diffraction, Mossbauer spectroscopy, and X-ray photoelectric spectroscopy. The negligible volume change during the electrochemical process should be responsible for the excellent cyclic stability.
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