Catalytically Active CoSe2 Supported on Nitrogen-Doped Three Dimensional Porous Carbon as a Cathode for Highly Stable Lithium-Sulfur Battery |
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| Authors: | Fenglong Zhang Hui Wang Prof Shan Ji Dr Vladimir Linkov Prof Xuyun Wang Prof Rongfang Wang |
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| Institution: | 1. State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, 266042 Qingdao, China;2. College of Biological, Chemical Science and Chemical Engineering, Jiaxing University, 314001 Jiaxing, China;3. South African Institute for Advanced Materials Chemistry, University of the Western Cape, 7535 Cape Town, South Africa |
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| Abstract: | Lithium-sulfur batteries are promising secondary energy storage devices that are mainly limited by its unsatisfactory cyclability owing to inefficient reversible conversion of sulfur and lithium sulfide on the cathode during the discharge/charging process. In this study, nitrogen-doped three-dimensional porous carbon material loaded with CoSe2 nanoparticles (CoSe2-PNC) is developed as a cathode for lithium-sulfur battery. A combination of CoSe2 and nitrogen-doped porous carbon can efficiently improve the cathode activity and its conductivity, resulting in enhanced redox kinetics of the charge/discharge process. The obtained electrode exhibits a high discharge specific capacity of 1139.6 mAh g?1 at a current density of 0.2 C. After 100 cycles, its capacity remained at 865.7 mAh g?1 thus corresponding to a capacity retention of 75.97 %. In a long-term cycling test, discharge specific capacity of 546.7 mAh g?1 was observed after 300 cycles performed at a current density of 1 C. |
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| Keywords: | CoSe2 N-doped carbon cathode stability lithium-sulfur battery |
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