期刊
ELECTROCHIMICA ACTA
卷 353, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136561
关键词
FeMoO4/FeS2/Mo2S3 composites; Controllable flower-like architecture; One-step solvothermal method; Cathode for LSBs
资金
- Ministry of Science and Technology of China [2016YFA0200200]
- National Nature Science Fund of China [21401049]
As one of the most anticipated energy storage systems, the application of lithium-sulfur batteries is hindered by low conductivity of insoluble sulfur species (S-8, Li2S2 and Li2S), the shuttle effect of soluble lithium polysulfides (Li2Sx, 4 = x <= 8) and the volume expansion of sulfur species during the cycling. To overcome these barriers, a tunable geometry of flower-like FeMoO4/FeS2/Mo2S3 composite is successfully investigated using simple one-step solvothermal technique. Fe-based sulfides with good conductivity and Mo-based sulfides with the efficient ability of catalytic sulfur species conversion are promising sulfur host for high performance lithium-sulfur batteries (LSBs). It should be noted that this is first time to introduce FeMoO4 as polysulfides anchoring material into the lithium-sulfur system. Consequently, the flower-like composite with 79 wt % sulfur loading exhibits a high initial capacity of 1600 mA h g(-1) and a reversible capacity of 781 mAh g(-1) after 300 cycles at 1 C. Even at a high rate of 10 C, a capacity of 421 mAh g(-1) is maintained after 300 cycles. (C) 2020 Elsevier Ltd. All rights reserved.
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