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论文类型：期刊论文

发表时间：2019-02-15

发表刊物：ChemElectroChem

收录刊物：SCIE、EI、Scopus

卷号：6

期号：4

页面范围：1115-1121

ISSN号：2196-0216

关键字：Graphene; in situ growth; lithium sulfur batteries; nitrogen-doped carbon nanotubes; synergistic effect

摘要：A nitrogen-doped carbon nanotubes/graphene (NCNTs-G) composite as the sulfur host for a lithium-sulfur battery has been fabricated by in situ growth of NCNTs on graphene in a onestep nickel-catalyzed thermolysis. The graphene sheet can function as a robust support to anchor NCNTs so that the specific surface area of the composite can be increased and the charge-transfer resistance is reduced. These features, together with the high N-doping level, impart the NCNTs-G/S cathode a high utilization of sulfur, and the polysulfide shuttle effect can be effectively inhibited by both physical confinement and chemical adsorption. Therefore, the NCNTs-G/S cathode shows high reversible capacities of 1484 mA h g(-1) and 985 mA h g(-1 )at the current rate of 0.1 C and 0.5 C, respectively. It also exhibits a good cycling stability; 82% of its initial capacity is retained after 150 cycles at 0.5 C, and a very small capacity decay rate of 0.06% per cycle resulted in 400 cycles at 1 C. Based on the above structural characteristics and battery performance results, the NCNTs-G/S is a promising cathode for a high-performance Li S battery.