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Sodium Ion Insertion in Hollow Carbon Nanowires for Battery Applications
journal contribution
posted on 2016-02-20, 17:27 authored by Yuliang Cao, Lifen Xiao, Maria L. Sushko, Wei Wang, Birgit Schwenzer, Jie Xiao, Zimin Nie, Laxmikant V. Saraf, Zhengguo Yang, Jun LiuHollow carbon nanowires (HCNWs) were prepared through
pyrolyzation
of a hollow polyaniline nanowire precursor. The HCNWs used as anode
material for Na-ion batteries deliver a high reversible capacity of
251 mAh g–1 and 82.2% capacity retention over 400
charge–discharge cycles between 1.2 and 0.01 V (vs Na+/Na) at a constant current of 50 mA g–1 (0.2 C).
Excellent cycling stability is also observed at an even higher charge–discharge
rate. A high reversible capacity of 149 mAh g–1 also
can be obtained at a current rate of 500 mA g–1 (2C).
The good Na-ion insertion property is attributed to the short diffusion
distance in the HCNWs and the large interlayer distance (0.37 nm)
between the graphitic sheets, which agrees with the interlayered distance
predicted by theoretical calculations to enable Na-ion insertion in
carbon materials.