Selenium Edge as a Selective Anchoring Site for Lithium–Sulfur Batteries with MoSe2/Graphene-Based Cathodes

2019 
For lithium–sulfur batteries (LSBs), the dissolution of lithium polysulfide and the consequent “shuttle effect” remain major obstacles for their practical applications. In this study, we designed a new cathode material comprising MoSe2/graphene to selectively adsorb polysulfides on the selenium edges and thus to mitigate their dissolution. More specifically, few-layered MoSe2 was first grown on nitrogen-doped reduced graphene oxide (N-rGO) using the chemical vapor deposition method and then infiltrated with sulfur as the cathode for LSBs. An initial capacity of 1028 mA h g–1 was achieved for S/MoSe2/N-rGO at 0.2 C, higher than 981 and 405.1 mA h g–1 for pure graphene and sulfur, respectively, along with enhanced cycling durability and rate capability. Moreover, the density functional theory simulation, in addition to the experimental adsorption test, X-ray photoelectron spectroscopy analysis, and transmission electron microscopy technique, reveals the dual roles that MoSe2 plays in improving the performan...
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