Research Article

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2019, 12(11): 2743–2748

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https://doi.org/10.1007/s12274-019-2508-3

Decorating CoSe2 hollow nanospheres on reduced graphene oxide as advanced sulfur host material for performance enhanced lithium-sulfur batteries

Liang Chen1,2 (*), Weiwei Yang2, Jianguo Liu2, and Yong Zhou2

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1 Hunan Collaborative Innovation Center of Environmental and Energy Photocatalysis, Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, China
2 Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China

Keywords: cobalt selenide, hollow nanospheres, chemisorption, lithium-sulfur batteries
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Although lithium-sulfur batteries are one of promising rechargeable energy storage devices, their wide applications are impeded by the lithium polysulfides shuttle effect, low electronic conductivity of the cathode, and sluggish redox reaction kinetics of lithium polysulfides. In this work, reduced graphene oxide was decorated with CoSe2 hollow nanospheres to form an RGO-CoSe2 composite that was used as a host material to support S in the cathode. The RGO-CoSe2 composite has the following superiorities: (1) enhanced electronic conductivity, (2) accommodation of the volumetric change of cathode materials, (3) effective confinement of numerous lithium polysulfides species due to chemisorption, (4) expedition of the redox kinetics of lithium polysulfides. As expected, the RGO-CoSe2-based cathode exhibited the reversible specific capacity of 1,044.7 mAh/g at 0.2C and 695.7 mAh/g at 2C, together with excellent cycling stability of 0.071% average capacity decay per cycle over 400 cycles at 1C.
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Decorating CoSe2 hollow nanospheres on reduced graphene oxide as advanced sulfur host material for performance enhanced lithium-sulfur batteries. Nano Res. 2019, 12(11): 2743–2748 https://doi.org/10.1007/s12274-019-2508-3

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