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MM: Fachverband Metall- und Materialphysik

MM 3: Materials for Energy Storage and Conversion

MM 3.4: Vortrag

Montag, 1. April 2019, 11:00–11:15, H44

Highly nitrogen doped carbon nanofibers with superior rate capability and cyclability for potassium ion batteries — •Chenglin Zhang, Yang Xu, Long Liu, and Yong Lei — Institute für Physics & IMN MacroNano (ZIK), Technische Universität Ilmenau, Ilmenau 98693, Germany

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. Quantitative analysis and theoretical simulations were employed to interpret the benefits of nitrogen doping and demonstrate the advantage of the pyrrolic and pyridinic N dopants over the quaternary N dopant. Surface-dominated K-storage is verified by quantitative kinetics analysis and theoretical investigation.[1] Considering the cost-effectiveness and material sustainability, our work may shed some light on searching for K-storage materials with high performance.

[1] Yang Xu; Chenglin Zhang; Min Zhou; Qun Fu; Chengxi Zhao; Minghong Wu* and Yong Lei*[J] Nature Commun. (2018) 9:1720.