Q.J. Shao, P.F. Lu, L. Xu, D.C. Guo, J. Gao, Z.-S. Wu, J. Chen∗
Journal of Energy Chemistry, 2020, 51, 262-271.
DOI: 10.1016/j.jechem.2020.03.035 [PDF]
Developing sulfur cathodes with high catalytic activity on accelerating the sluggish redox kinetics of lithium polysulfides (LiPSs) and unveiling their mechanisms are pivotal for advanced lithium–sulfur (Li–S) batteries. Herein, MoS2is verified to reduce the Gibbs free energy for rate-limiting step of sulfur reduction and the dissociation energy of lithium sulfide (Li2S) for the first time employing theoretical calculations. The MoS2nanosheets coated on mesoporous hollow carbon spheres (MHCS) are then reasonably designed as a sulfur host for high-capacity and long-life Li–S battery, in which MHCS can guarantee the high sulfur loading and fast electron/ion transfer. It is revealed that the shuttle effect is efficiently inhibited because of the boosted conversion of LiPSs. As a result, the coin cell based on thewith extraordinary capacity retention of 79.8% at 0.1 C after 170 cycles. Therefore, this work paves a new avenue for developing practical high specific energy and long-life pouch-type Li–S batteries.