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

Nature Communications
Bifa JiYongbing Tang

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.

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Citations

Nov 6, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yi Zhi ChuKhian-Hooi Chew
Jan 1, 2021·Advanced Materials·Jun MeiZongyou Yin
Jan 16, 2021·Small·Xianglong HuangZhiming M Wang
Dec 29, 2020·Chemistry : a European Journal·Weisheng ZhangQichun Zhang
Feb 16, 2021·Chemical Communications : Chem Comm·Xiaolong HeYongbing Tang
Dec 24, 2020·Angewandte Chemie·Kai YangYongbing Tang
May 11, 2021·Advanced Materials·Nanzhong WuYongbing Tang
Jul 23, 2020·ACS Applied Materials & Interfaces·Tomooki HosakaShinichi Komaba
Nov 17, 2020·Inorganic Chemistry·Jinghua CaiYongbing Tang
Sep 15, 2021·ACS Applied Materials & Interfaces·Hongzheng WuWenhui Yuan

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Methods Mentioned

BETA
X-ray
electron diffraction
differential scanning calorimetry

Software Mentioned

EXPGUI
Vienna ab initio simulation package
GSAS

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