MCNT/MoS₂ promoting the electrochemical performance of lithium-sulfur batteries by adsorption polysulfide

Li–S battery has high theoretical specific capacity and specific energy, but the shuttle effect challenges its commercial application. So many composite materials had been prepared to conquer it. In this research, MCNT/MoS₂/S composite and MCNT/MoS₂/S composite cathode were prepared respectively by a facile hydrothermal method and by melt diffusion method. MoS₂ and MCNT showed uniformly combined together by SEM and TEM. The electrochemical properties of the MCNT/MoS₂/S cathode were carried out on a Gamry electrochemical workstation. The initial capacity arrive 820 mAh·g⁻¹ at 0.1 C, and specific capacities up to ∼460 mAh·g⁻¹ over more than 300 cycles at 0.5 C. The improvement of electrochemical performance due to MoS₂ strongly adsorbing polysulfide and the conductivity network of MCNT. (paper)