Defect-free potassium manganese hexacyanoferrate cathode material for high-performance potassium-ion batteries

Leqing Deng, Jiale Qu, Xiaogang Niu, Juzhe Liu, Juan Zhang, Youran Hong, Meiying Feng, Jiangwei Wang, Miao Hu, Liang Zeng, Qianfan Zhang (), Lin Guo () and Yujie Zhu ()
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Leqing Deng: Beihang University
Jiale Qu: Beihang University
Xiaogang Niu: Beihang University
Juzhe Liu: Beihang University
Juan Zhang: Beihang University
Youran Hong: Zhejiang University
Meiying Feng: Beihang University
Jiangwei Wang: Zhejiang University
Miao Hu: CNOOC Research Institute of Refining and Petrochemicals
Liang Zeng: Tianjin University
Qianfan Zhang: Beihang University
Lin Guo: Beihang University
Yujie Zhu: Beihang University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract 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 (K2Mn[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 K2Mn[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 K2Mn[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 K2Mn[Fe(CN)6] material are attributed to its stable frameworks that benefit from the defect-free structure.

Date: 2021
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DOI: 10.1038/s41467-021-22499-0

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