Chemical vapor deposited MoS2/electrospun carbon nanofiber composite as anode material for high-performance sodium-ion batteries
Chemical vapor deposited MoS2/electrospun carbon nanofiber composite as anode material for high-performance sodium-ion batteries
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DOI：
10.1016/j.electacta.2016.11.170
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发表时间：
2016-12-20
影响因子：
6.6
通讯作者：
Zhang, Xiangwu
中科院分区：
文献类型：
--
作者：
Chen, Chen;Li, Guoqing;Zhang, Xiangwu
由于其高理论容量和独特的层状结构，MoS2作为钠离子电池负极材料引起了人们的关注。然而，MoS2基阳极的电化学性能因其固有电导率低和循环过程中体积变化大而受到阻碍。在本报告中，使用可扩展的化学气相沉积方法在电纺碳纳米纤维（CNF）表面合成了纳米级MoS2片材。通过扫描电子显微镜、透射电子显微镜和X射线衍射研究了所得MoS2@CNF的形貌，同时使用循环伏安法和恒电流充放电研究了其电化学性能。结果表明，MoS2 纳米片和 CNF 之间形成了牢固的互连，并且 CNF 的导电网络有利于钠离子动力学。作为钠离子电池负极进行研究时，经过50次循环后获得了380 mAh g(-1)的高可逆容量，且循环稳定性良好。特别是，MoS2@CNFs在1 A g(-1)的高电流密度下循环500次后容量可达198 mAh g(-1)，表明其作为长寿命钠离子电池负极材料的巨大潜力。 (C) 2016 Elsevier Ltd. 保留所有权利。
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, nanosized 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. (C) 2016 Elsevier Ltd. All rights reserved.