A Freestanding Selenium Disulfide Cathode Based on Cobalt Disulfide-Decorated Multichannel Carbon Fibers with Enhanced Lithium Storage Performance

SeS₂ shows attractive advantages beyond bare S and Se as a cathode material for lithium storage. Here, a freestanding lotus root-like carbon fiber network decorated with CoS₂ nanoparticles (denoted as CoS₂@LRC) has been designed and prepared as the SeS₂ host for enhancing the lithium storage performance. The integrated electrode is constructed by three-dimensional interconnected multichannel carbon fibers, which can not only accommodate high content of SeS₂ (70 wt %), but also promise excellent electron and ion transport for achieving high capacity utilization of 1015 mAh g⁻¹ at 0.2 A g⁻¹. What is more, there are numerous CoS₂ nanoparticles decorated all over the inner walls and surfaces of the carbon fibers, providing efficient sulfiphilic sites for restricting the dissolution of polysulfides and polyselenides during the electrochemical processes, thus successfully suppressing the shuttle effect and maintaining excellent cycling stability over 400 cycles at 0.5 A g⁻¹. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim