Abstract：
:Potassium-ion batteries are a compelling technology for large scale energy storage due to their low-cost and good rate performance. However, the development of potassium-ion batteries remains in its infancy, mainly hindered by the lack of suitable cathode materials. Here we show that a previously known frustrated magnet, KFeC2O4F, could serve as a stable cathode for potassium ion storage, delivering a discharge capacity of ~112 mAh g-1 at 0.2 A g-1 and 94% capacity retention after 2000 cycles. The unprecedented cycling stability is attributed to the rigid framework and the presence of three channels that allow for minimized volume fluctuation when Fe2+/Fe3+ redox reaction occurs. Further, pairing this KFeC2O4F cathode with a soft carbon anode yields a potassium-ion full cell with an energy density of ~235 Wh kg-1, impressive rate performance and negligible capacity decay within 200 cycles. This work sheds light on the development of low-cost and high-performance K-based energy storage devices.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Ji B,Yao W,Zheng Y,Kidkhunthod P,Zhou X,Tunmee S,Sattayaporn S,Cheng HM,He H,Tang Ydoi
10.1038/s41467-020-15044-ysubject
Has Abstractpub_date
2020-03-06 00:00:00pages
1225issue
1issn
2041-1723pii
10.1038/s41467-020-15044-yjournal_volume
11pub_type
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