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.