期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 166, 期 3, 页码 A5386-A5395出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0501903jes
关键词
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资金
- Hong Kong Research grant Council (HK RGC) [N_PolyU601/16, 21661162002]
- National Natural Science Foundation [N_PolyU601/16, 21661162002]
- Natural Science Foundation of Guangdong Province [2015A030310463]
- Science and Information Technology of Guangzhou Municipal [201704030061]
- Centre of Excellent grant from HK PolyU [1-ZE30]
A dual function cathode consisting of tungsten disulfide and porous carbon nanosheets (WS2/C) was synthesized to improve the performance of lithium sulfur batteries. The well-defined structure is composed of <= 5 layers with 0.62 nm interlayer spacing corresponding to the (002) facial plane of WS2. The composite depicted very strong affinity toward lithium polysulfides. Rapid transport of lithium ions was also revealed. The cathode demonstrated excellent cycling stability and rate capability by delivering a reversible specific capacity of 419mAh g(-1) at 8C after 500 cycles with low capacity fading at 0.04% per cycle. At high sulfur loading of 4.7mg cm(-2) the batteries delivered 3.4mAh cm(-2) areal capacity after 100 cycles at 0.5C. The synergistic effect of strong chemical interaction between lithium polysulfides and WS2, and the superior electronic conductivity of carbon nanosheets are responsible for the enhanced performance. It also suppressed the self-discharge phenomenon by maintaining 94.5% of its initial capacity after 10 days resting. The electrochemical impedance spectroscopy (EIS) analysis demonstrated that even after 400 cycles, the interfacial and charge transfer resistances only increased by 1.2 and 1.7 Omega, respectively, describing faster electrochemical kinetics by inhibiting the formation of insulating layer of lithium sulfide (Li2S) on the surface of the electrodes. (C) The Author(s) 2019. Published by ECS.
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