Wu Ping, Hu Hai-Yan, Xie Ning, Wang Chen, Wu Fan, Pan Ming, Li Hua-Fei, Wang Xiao-Di, Zeng Zheling, Deng Shuguang, Dai Gui-Ping
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.
RSC Adv. 2019 Oct 10;9(55):32247-32257. doi: 10.1039/c9ra05202j. eCollection 2019 Oct 7.
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 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 at a current density of 0.1C. Moreover, it retained a specific capacity of 685 mA h g 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.
在此，三维（3D）氮掺杂还原氧化石墨烯（N-rGO）纳米片上均匀分布着Co-Ni-S（CNS）纳米颗粒，形成了CNS/N-rGO复合材料，作为锂硫电池的硫主体材料。CNS纳米颗粒以及CNS/N-rGO中的氮与多硫化物强烈相互作用，而石墨烯作为导电网络，可以提高其电导率。采用硫熔融扩散法制备了CNS/N-rGO/硫复合阴极。电化学研究表明，CNS/N-rGO/硫阴极在0.1C电流密度下的初始放电容量为1430 mA h g。此外，在0.5C下循环300次后，其比容量保持在685 mA h g，库仑效率为98%，优于商业rGO。这种复合材料用作锂硫电池的硫阴极，表现出优异的倍率性能和出色的长循环稳定性。
