Chemical vapor deposited MoS2/electrospun carbon nanofiber composite as anode material for high-performance sodium-ion batteries

By Chen, Chen; Li, Guoqing; Lu, Yao; Zhu, Jiadeng; Jiang, Mengjin; Hu, Yi; Cao, Linyou; Zhang, Xiangwu
Published in Electrochimica Acta NULL 2016

Abstract

Abstract Due to its high theoretical capacity and unique layered structure, MoS2 has attracted attention as a sodium-ion battery anode material. However, the electrochemical performance of MoS2 based anodes is hindered by their low intrinsic conductivity and large volume change during cycling. In this report, nano-sized MoS2 sheets are synthesized using a scalable chemical vapor deposition method on the surface of electrospun carbon nanofibers (CNFs). The morphology of the resultant MoS2@CNFs is investigated by scanning electron microscopy, transmission electron microscopy and X-ray diffraction, while their electrochemical performance is studied using cyclic voltammetry and galvanostatic charge-discharge. The results demonstrate that a strong interconnection between MoS2 nanosheets and {CNFs} is formed and the conductive network of {CNFs} is beneficial for the sodium ion kinetics. When investigated as an anode for sodium-ion batteries, a high reversible capacity of 380 mA h g?1 is obtained after 50 cycles with good cycling stability. In particular, MoS2@CNFs can deliver a capacity of 198 mA h g?1 under a high current density of 1 A g?1 after 500 cycles, indicating their great potential as anode material for long-life sodium-ion batteries.

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