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

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.

SUBMITTER: Xu Y

PROVIDER: S-EPMC5928078 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature

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

Xu Yang Y Zhang Chenglin C Zhou Min M Fu Qun Q Zhao Chengxi C Wu Minghong M Lei Yong Y

Nature communications 20180430 1

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 ...[more]

PMID: 29712922

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