High electrochemical performance of hierarchical CoMoS3.13/SnO2 nanocomposites as lithium-sulfur battery cathode

摘要

Hierarchical CoMoS313/SnO2 nanocomposites as cathode of lithium-sulfur (Li-S) battery are prepared by a two-step method. The synergistic effect between CoMoS313 and SnO2 leads to high capacity, cyclability and rate capability. The reversible capacity of hierarchical CoMoS313/SnO2 nanocomposites is up to 770 mA h g(-1) at 0.3C rate (similar to 3 h per half cycle) and maintains 718 mA h g(-1) after 50 cycles, much higher than that of pure CoMoS313 nanosheets. And the diffusion of lithium polysulfide can be restrained by SnO2 nanoparticles shell, avoiding the loss of material during cycling. The present results indicate that hierarchical CoMoS313/SnO2 nanocomposites are good candidates for the cathode of Li-S battery. (C) 2016 Elsevier B.V. All rights reserved.