A fluoroxalate cathode material for potassium-ion batteries with ultra-long cyclability

Bifa Ji, Wenjiao Yao, Yongping Zheng, Pinit Kidkhunthod, Xiaolong Zhou, Sarayut Tunmee, Suchinda Sattayaporn, Hui-Ming Cheng (), Haiyan He and Yongbing Tang ()
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Bifa Ji: Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences
Wenjiao Yao: Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences
Yongping Zheng: Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences
Pinit Kidkhunthod: Synchrotron Light Research Institute, 111 University Avenue, Muang District
Xiaolong Zhou: Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences
Sarayut Tunmee: Synchrotron Light Research Institute, 111 University Avenue, Muang District
Suchinda Sattayaporn: Synchrotron Light Research Institute, 111 University Avenue, Muang District
Hui-Ming Cheng: Tsinghua University
Haiyan He: Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences
Yongbing Tang: Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-15044-y

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