期刊
ACS NANO
卷 13, 期 11, 页码 13235-13243出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b06267
关键词
lithium-sulfur batteries; VTe2@MgO heterostructure; promotor; polysulfide shuttle; sulfur reaction kinetics
类别
资金
- National Natural Science Foundation of China [51702225]
- National Key Research and Development Program [2016YFA0200103]
- Natural Science Foundation of Jiangsu Province [BK20170336]
- Beijing Municipal Science and Technology Commission [Z161100002116020]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Suzhou, China
Lithium-sulfur (Li-S) batteries are recognized as one of the most promising energy storage systems due to the high energy density and cost effectiveness. However, their practical implementation has still been handicapped due to notorious lithium polysulfide (LIPS) shuttle and depressed sulfur redox kinetics. It is therefore desirable to exploit key mediators synergizing electrical conductivity and electrocatalytic activity for the cathode. Herein, we report the employment of atmospheric pressure chemical vapor deposition to harness the efficient and controllable synthesis of metallic VTe2 over particulated MgO substrates, which has scarcely been demonstrated by conventional wet-chemical synthetic routes thus far. The thus-derived VTe2@MgO heterostructure as an efficient promotor enables effective regulation of LiPSs with respect to polysulfide capture/conversion and Li2S decomposition. As a result, a S/VTe2@MgO cathode with a sulfur loading of 1.6 mg cm(-2) harvests long-term cyclability with a negligible capacity decay of 0.055% per cycle over 1000 cycles at 1.0 C. Even at a sulfur loading of 6.9 mg cm(-2), the cathode still delivers electrochemical performances that can rival the state-of-the-art high-loading counterparts. Our work might offer a feasible solution for developing heterostructured promotors with multifunctionality and electrocatalytic activity for high-performance Li-S batteries.
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