Highly nitrogen doped carbon nanofibers with superior rate capability and cyclability for potassium ion batteries

Yang Xu, Chenglin Zhang, Min Zhou, Qun Fu, Chengxi Zhao, Minghong Wu () and Yong Lei ()
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Yang Xu: Technische Universität Ilmenau
Chenglin Zhang: Shanghai University
Min Zhou: Technische Universität Ilmenau
Qun Fu: Shanghai University
Chengxi Zhao: East China University of Science and Technology
Minghong Wu: Shanghai University
Yong Lei: Technische Universität Ilmenau

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: Abstract Potassium-ion batteries are a promising alternative to lithium-ion batteries. However, it is challenging to achieve fast charging/discharging and long cycle life with the current electrode materials because of the sluggish potassiation kinetics. Here we report a soft carbon anode, namely highly nitrogen-doped carbon nanofibers, with superior rate capability and cyclability. The anode delivers reversible capacities of 248 mAh g–1 at 25 mA g–1 and 101 mAh g–1 at 20 A g–1, and retains 146 mAh g–1 at 2 A g–1 after 4000 cycles. Surface-dominated K-storage is verified by quantitative kinetics analysis and theoretical investigation. A full cell coupling the anode and Prussian blue cathode delivers a reversible capacity of 195 mAh g–1 at 0.2 A g–1. Considering the cost-effectiveness and material sustainability, our work may shed some light on searching for K-storage materials with high performance.

Date: 2018
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DOI: 10.1038/s41467-018-04190-z

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