A N-doped graphene–cobalt nickel sulfide aerogel as a sulfur host for lithium–sulfur batteries |
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| Authors: | Ping Wu Hai-Yan Hu Ning Xie Chen Wang Fan Wu Ming Pan Hua-Fei Li Xiao-Di Wang Zheling Zeng Shuguang Deng Gui-Ping Dai |
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| Affiliation: | Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031 Jiangxi China.; Institute for Advanced Study, Nanchang University, Nanchang Jiangxi 330031 China ; Department of Chemical Engineering, School for Engineering of Matter Transport and Energy, Arizona State University, Tempe AZ 85287 USA, |
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| Abstract: | Herein, three-dimensional (3D) N-doped reduced graphene oxide (N-rGO) nanosheets were decorated with a uniform distribution of Co–Ni–S (CNS) nanoparticles to form the CNS/N-rGO composite as a sulfur host material for lithium–sulfur batteries. The CNS nanoparticles and N in CNS/N-rGO strongly interact with polysulfides, whereas graphene, as a conductive network, can improve its electrical conductivity. A CNS/N-rGO/sulfur composite cathode was prepared via the sulfur melting diffusion method. The electrochemical study showed that the CNS/N-rGO/sulfur cathode delivered an initial discharge capacity of 1430 mA h g−1 at a current density of 0.1C. Moreover, it retained a specific capacity of 685 mA h g−1 after 300 cycles at 0.5C with a coulombic efficiency of 98%, which was better than that of commercial rGO. This composite was used as a sulfur cathode for a lithium–sulfur battery, exhibiting excellent rate capability and remarkable performance in terms of long cycling stability.Herein, three-dimensional (3D) N-doped reduced graphene oxide (N-rGO) nanosheets were decorated with a uniform distribution of Co–Ni–S (CNS) nanoparticles to form the CNS/N-rGO composite as a sulfur host material for lithium–sulfur batteries. |
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