A melt-diffusion strategy for tunable sulfur loading on CC@MoS2 for lithium–sulfur​ batteries

• Published in: Energy reports Vol. 6; pp. 172 - 180
• Main Authors: Tian, Chengxiang, Wu, Juwei, Ma, Zheng, Li, Bo, Zhang, Xu, Zu, Xiaotao, Xiang, Xia, Li, Sean
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2020; Elsevier
• Subjects: Carbon cloth; lithium–sulfur batteries; MoS2; Polysulfides; Two-step melt-diffusion strategy; lithium–sulfur batteries; Carbon cloth; Polysulfides; MoS2; Two-step melt-diffusion strategy
• ISSN: 2352-4847; 2352-4847
• DOI: 10.1016/j.egyr.2020.06.007

For lithium–sulfur batteries, 3D cathodes might be of interest for containing the active material and trapping the polysulfides during cycling, owing to their binder-free and freestanding features. In this work, the MoS2 grown on the 3D structured Carbon Cloth (CC@MoS2) is firstly used to fabricate the Li–S battery and the sulfur loading can be freely tuned by adjusting thermal annealing time at 200 °C. A two-step melt-diffusion strategy is reported for fabrication of cathodes, which involves in melting and diffusion of sulfur covered by CC@MoS2 composites instead of dissolution of sulfur in the toxic organic solvents. Compared with the non-polar carbon cloth, the CC@MoS2 composites exhibit better adsorption capacity for polysulfides due to more edge active sites, which could effectively facilitate polysulfide redox kinetics. The SEM images of the CC@MoS2 cathode after 300 cycles show that MoS2 can still maintain the nanosheet morphology. After 300 cycles at 0.5 C, the CC@MoS2 cathodes loaded with 2 mg sulfur exhibit a better reversible capacity of 698 mA h g−1 compared with CC@MoS2 loaded with 1 mg sulfur (604 mA h g−1) and CC@MoS2 loaded with 4 mg sulfur (420 mA h g−1). This work proposes an environmentally friendly method to fabricate the lithium–sulfur battery cathode material and the sulfur loading can be freely adjusted. [Display omitted] •The CC@MoS2composite is firstly used to fabricate the Li–S battery.•We present a low-cost two-step melt-diffusion strategy for fabrication of cathodes.•The MoS2 can still maintain the nanosheet morphology after 300 cycles.