期刊
ADVANCED MATERIALS
卷 32, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202000315
关键词
bidirectional catalysts; heterostructures; lithium-sulfur batteries; Ni3S2; TiO2
类别
资金
- National Key Research and Development Program of China [2018YFE0124500, 2019YFA0705700]
- National Natural Science Foundation of China [51932005, 51772164]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2017B030306006]
- Shenzhen Basic Research Project [JCYJ20170412171359175, JCYJ20180508152037520]
- Shenzhen Graphene Manufacturing Innovation Center [201901161513]
Accelerated conversion by catalysis is a promising way to inhibit shuttling of soluble polysulfides in lithium-sulfur (Li-S) batteries, but most of the reported catalysts work only for one direction sulfur reaction (reduction or oxidation), which is still not a root solution since fast cycled use of sulfur species is not finally realized. A bidirectional catalyst design, oxide-sulfide heterostructure, is proposed to accelerate both reduction of soluble polysulfides and oxidation of insoluble discharge products (e.g., Li2S), indicating a fundamental way for improving both the cycling stability and sulfur utilization. Typically, a TiO2-Ni(3)S(2)heterostructure is prepared by in situ growing TiO(2)nanoparticles on Ni(3)S(2)surface and the intimately bonded interfaces are the key for bidirectional catalysis. For reduction, TiO(2)traps while Ni(3)S(2)catalytically converts polysulfides. For oxidation, TiO(2)and Ni(3)S(2)both show catalytic activity for Li2S dissolution, refreshing the catalyst surface. The produced sulfur cathode with TiO2-Ni(3)S(2)delivers a low capacity decay of 0.038% per cycle for 900 cycles at 0.5C and specially, with a sulfur loading of 3.9 mg cm(-2), achieves a high capacity retention of 65% over 500 cycles at 0.3C. This work unlocks how a bidirectional catalyst works for boosting Li-S batteries approaching practical uses.
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