期刊
SMALL
卷 14, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201702853
关键词
carbon nanotube films; lithium-sulfur batteries; molybdenum diphosphide; multifunctional interlayers
类别
资金
- NSFC [51472141]
- National Basic Research Program of China [2012CB932301, 2016YFA0301001]
- Beijing Municipal Science and Technology Commission [D161100002416003]
A multifunctional interlayer, composed of molybdenum diphosphide (MoP2) nanoparticles and a carbon nanotube (CNT) film, is introduced into a lithium-sulfur (Li-S) battery system to suppress polysulfide migration. Molybdenum diphosphide acts as the catalyst and can capture polysulfides and improve the polysulfide conversion activity during the discharge/charge processes. The CNT film acts as a conductive skeleton to support the MoP2 nanoparticles and to ensure their uniform distribution. The CNT film physically hinders polysulfide migration, acts as a current collector, and provides abundant electron pathways. The Li-S battery containing the multifunctional MoP2/CNT interlayer exhibits excellent electrochemical performance. It delivers a reversible specific capacity of 905 mA h g(-1) over 100 cycles at 0.2 C, with a capacity decay of 0.152% per cycle. These results suggest the introduction of the multifunctional CNT/MoP2 interlayer as an effective and practical method for producing high-performance Li-S batteries.
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