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Defect-free potassium manganese hexacyanoferrate cathode material for high-performance potassium-ion batteries
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Defect-free potassium manganese hexacyanoferrate cathode material for high-performance potassium-ion batteries
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Journal Article
Defect-free potassium manganese hexacyanoferrate cathode material for high-performance potassium-ion batteries
2021
Overview
Potassium-ion batteries (KIBs) are promising electrochemical energy storage systems because of their low cost and high energy density. However, practical exploitation of KIBs is hampered by the lack of high-performance cathode materials. Here we report a potassium manganese hexacyanoferrate (K
2
Mn[Fe(CN)
6
]) material, with a negligible content of defects and water, for efficient high-voltage K-ion storage. When tested in combination with a K metal anode, the K
2
Mn[Fe(CN)
6
]-based electrode enables a cell specific energy of 609.7 Wh kg
−1
and 80% capacity retention after 7800 cycles. Moreover, a K-ion full-cell consisting of graphite and K
2
Mn[Fe(CN)
6
] as anode and cathode active materials, respectively, demonstrates a specific energy of 331.5 Wh kg
−1
, remarkable rate capability, and negligible capacity decay for 300 cycles. The remarkable electrochemical energy storage performances of the K
2
Mn[Fe(CN)
6
] material are attributed to its stable frameworks that benefit from the defect-free structure.
Potassium-ion battery is a promising candidate for post-Li-ion energy storage but the lack of cathode materials hinders practical exploitation. Here the authors investigate defect-free potassium manganese hexacyanoferrate as cathode active material for high energy and long lifespan K-based cells.
