Journal
APPLIED SURFACE SCIENCE
Volume 466, Issue -, Pages 309-319Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.10.046
Keywords
Lithium-sulfur batteries; Polysulfide immobilization; Multi-functional separator; CuS; Graphene
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Funding
- Scientific Research Foundation for Selected Overseas Chinese Scholars, Ministry of Human Resources and Social Security of China [CG2015003002]
- Program for the Outstanding Young Talents of Hebei Province
- Natural Science Foundation of Hebei Province of China [E2015202037]
- Science and Technology Correspondent Project of Tianjin [14JCTPJC00496]
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Herein, we demonstrate a facile synthesis process to fabricate and deposit flower-like CuS/graphene nano- composite on a multi-functional separator for efficient immobilization of polysulfides of lithium/sulfur (Li/S) batteries. Admirably, as-prepared CuS/graphene composite endows enriched oxygen-functional groups and excellent electrical conductivity for cathode area. The introduction of CuS/graphene-coated separator effectively reduced the dissolution of lithium polysulfides as well as enhanced the integrity of the sulfur cathode for Li/S batteries. The cell with these modified separator delivered an enviable discharge capacity of 1302 mAh g(-1) at 0.2 C, as well as an excellent reversible capacity of 760 mAh g(-1) after 100 cycles. Furthermore, an outstanding rate capability of 568 mAh g(-1 )at 3.0 C has been achieved in the cell with CuS/graphene-coated separator. The results reveal that CuS/graphene-coated separator shows an admirable potentiality to boost the performance of next-generation Li/S batteries.
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