Journal
NANO RESEARCH
Volume 13, Issue 8, Pages 2143-2148Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2821-x
Keywords
Co9S8@C; cathode host; shuttle effect; catalyst; Li-S batteries
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Funding
- National Postdoctoral Program for Innovation Talents [BX201700103]
- China Postdoctoral Science Foundation [2018M633664]
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Lithium sulfur (Li-S) batteries with high specific capacity and energy density can bring enormous opportunities for the nextgeneration energy storage systems. However, the severe dissolution and shuttle effect of lithium polysulfides (LiPSs) is still the key issue that seriously impedes the development of practical Li-S batteries. Here, polar Co9S8 inlaid carbon nanoboxes (Co9S8@C NBs) have been investigated as cathode host for high-performance Li-S batteries. In this integrated structure, Co9S8 nanocrystals not only provide strong chemisorptive capability for polar LiPSs, but also act as a catalyst to accelerate polysulfide redox reactions; while carbon nanobox with large inner space can offer enough space to relieve the volume expansion and physically confine LiPSs' dissolution. As a result, the S/Co9S8@C NBs cathode exhibits high specific capacity at 1C and the capacity retention was similar to 83% after 400 cycles, corresponding to an average decay rate of only similar to 0.043% per cycle.
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