Journal
ADVANCED SCIENCE
Volume 6, Issue 16, Pages -Publisher
WILEY
DOI: 10.1002/advs.201802362
Keywords
catalytic effect; layer-by-layer; lithium-sulfur batteries; MOF-derived; ultrafine CoS2 nanoparticles
Categories
Funding
- National Key Research and Development Program of China New Energy Project for Electric Vehicle [2016YFB0100204]
- National Natural Science Foundation of China [51772030]
- Joint Funds of the National Natural Science Foundation of China [U1564206]
- Major achievements Transformation Project for Central University in Beijing
- Beijing Key Research and Development Plan [Z181100004518001]
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Rechargeable high-energy lithium-sulfur batteries suffer from rapid capacity decay and poor rate capability due to intrinsically intermediate polysulfides' shuttle effect and sluggish redox kinetics. To tackle these problems simultaneously, a layer-by-layer electrode structure is designed, each layer of which consists of ultrafine CoS2-nanoparticle-embedded porous carbon evenly grown on both sides of reduced graphene oxide (rGO). The CoS2 nanoparticles derived from metal-organic frameworks (MOFs) have an average size of approximate to 10 nm and can facilitate the conversion between Li2S6 and Li2S2/Li2S in the liquid electrolyte by a catalytic effect, leading to improved polysulfide redox kinetics. In addition, the interconnected conductive frameworks with hierarchical pore structure afford fast ion and electron transport and provide sufficient space to confine polysulfides. As a result, the layer-by-layer electrodes exhibit good rate capabilities with 1180.7 and 700 mAh g(-1) at 1.0 and 5.0 C, respectively, and maintain an impressive cycling stability with a low capacity decay of 0.033% per cycle within ultralong 1000 cycles at 5.0 C. Even with a high sulfur loading of 3.0 mg cm(-2), the electrodes still show high rate performance and stable cycling stability over 300 cycles.
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