期刊
ACS NANO
卷 11, 期 9, 页码 9048-9056出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b03591
关键词
reverse microemulsion; surfactants; sulfur solubility; carboxylated graphene; functionalized carbon cloth; sulfur cathode
类别
资金
- Australian Government Research Training Program Scholarship
- Excellerate Australia Professional Development Fund [AA2020CRC]
- Australian Research Council (ARC) [DP1601012627]
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Australia
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Centre - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
- Heilongjiang Province Natural Science Foundation (key project) [ZD2016-001]
- Jiamusi University Technology Innovation Team [Cxtdpy-2016-01]
Due to its high theoretical capacity, high energy density, and easy availability, the lithium-sulfur (Li-S) system is considered to be the most promising candidate for electric and hybrid electric vehicle applications. Sulfur/carbon cathode in Li-S batteries still suffers, however, from low Coulombic efficiency and poor cycle life when sulfur loading and the ratio of sulfur to carbon are high. Here, we address these challenges by fabricating a sulfur/carboxylated-graphene composite using a reverse (water-in-oil) micro emulsion technique. The fabricated sulfur-graphene composite cathode, which contains only 6 wt % graphene, can dramatically improve the cycling stability as well as provide high capacity. The electro-chemical performance of the sulfur-graphene composite is further enhanced after loading into a three-dimensional heteroatom-doped (boron and nitrogen) carbon-cloth current collector. Even at high sulfur loading (similar to 8 mg/cm(2)) on carbon cloth, this composite showed 1256 mAh/g discharge capacity with more than 99% capacity retention after 200 cycles.
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