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Facile preparation of robust porous MoS2/C nanosheet networks as anode material for sodium ion batteries

Zhang, Rui, Li, Huiyong, Sun, Dan, Luan, Jingyi, Huang, Xiaobing, Tang, Yougen, Wang, Haiyan
Journal of materials science 2019 v.54 no.3 pp. 2472-2482
anodes, batteries, carbon, electrochemistry, freeze drying, molybdenum disulfide, nanosheets, phosphides, sodium, sodium chloride
Developing advanced MoS₂ anode material for sodium ion battery is still a big challenge since it is hindered by poor cycling stability and rate capability owing to huge volume variation during charge/discharge processes and low conductivity. In this work, three-dimensional porous networks consisting of several-layered MoS₂/C nanosheets are synthesized via a facile freeze-drying approach using NaCl as template. MoS₂/C nanosheet networks demonstrate a high reversible capacity of 389 mAh g⁻¹ and maintain 370 mAh g⁻¹ after 100 cycles at 100 mA g⁻¹, indicating excellent cycling stability. Good rate properties are also achieved with reversible capacities of 292, 256, 223, 174 mAh g⁻¹ at 1, 2, 4, 6 A g⁻¹, respectively. The excellent electrochemical performance can be ascribed to the unique three-dimensional networks consisting of few-layered MoS₂ nanosheets, which facilitates sodium ion diffusion via near-surface reaction. Moreover, the robust three-dimensional carbon matrix can not only provide a conductive network, but also buffer the strain and maintain the electrode integrity during repeated sodiation/desodiation process. This strategy presents a new path for fabricating low-cost and high-yield three-dimensional metal sulfide (phosphide)/carbon composites for applications in energy-related fields and beyond.