Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-04190-z
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Funding
- European Research Council (ThreeDsurface) [240144]
- European Research Council (HiNaPc) [737616]
- BMBF (ZIK-3DNanoDevice) [03Z1MN11]
- German Research Foundation (DFG) [LE 2249_4-1]
- National Natural Science Foundation of China [21577086, 41430644]
- Shanghai Thousand Talent Plan
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13078]
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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.
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