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《能源化学(英文版)》 2019-08
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Graphene/RuO_2 nanocrystal composites as sulfur host for lithium-sulfur batteries

Jian-Qiu Huang;Jiaqiang Huang;Woon Gie Chong;Jiang Cui;Shanshan Yao;Baoling Huang;Jang-Kyo Kim;Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology;  
An optimized graphene/RuO_2/S composite is prepared by hydrothermal growth of RuO_2 particles on graphene oxide sheets as the positive electrode for rechargeable lithium-sulfur batteries. The electrode with 6.1 wt% RuO_2 nanocrystals and a high sulfur content of 79.0 wt% delivers an optimal electrochemical performance with high residual capacities of 508 mAh g-1 after 200 cycles and 389 m Ah g-1 after800 cycles at 1 C with a low capacity decay of 0.054%. The RuO_2 nanocrystals promote the redox reaction kinetics and facilitate the transformation of sulfur chemistry, leading to large improvements in reversibility and rate capability of the composite electrode. The density functional theory calculations signify the formation of Li–O and Ru–S bonds through chemical interactions between RuO_2 and Li polysulfides while the adsorption energies between graphene and polysulfide species are much higher in the presence of RuO_2 than that of the neat graphene acting alone. These discoveries support the efficient entrapment of polysulfides by the composite electrode to the benefit of enhanced cyclic stability of the battery.
【Fund】: financially supported by the Research Grants Council(GRF Projects 16212814 and 16208718);; the Innovation and Technology Commission(ITF Project Code ITS/001/17)of Hong Kong SAR;; the technical assistance from the Materials Characterization and Preparation Facilities(MCPF);; the Advanced Engineering Materials Facilities(AEMF)of HKUST
【CateGory Index】: TM912;TB33
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