期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 43, 期 3, 页码 1111-1120出版社
WILEY
DOI: 10.1002/er.4334
关键词
electrospinning; li-S batteries; MoO2-CNFs; multifunctional interlayer; surface morphology
资金
- National Natural Science Foundation of China [51874146, 51504101]
- China Postdoctoral Science Foundation [2018T110551, 2017M621640]
- Six Talent Peaks Project of Jiangsu Province [XCL-125]
- Natural Science Foundation of Jiangsu Province [BK20150514]
- Start-up Foundation of Jiangsu University for Senior Talents [15JDG014]
Lithium-sulfur (Li-S) battery based on sulfur cathodes is of great interest because of high capacity and abundant sulfur source. But the shuttling effect of polysulfides caused by charge-discharge process results in low sulfur utilization and poor reversibility. Here, we demonstrate a good approach to improve the utility of sulfur and cycle life by synthesizing carbon nanofibers decorated with MoO2 nanoparticles (MoO2-CNFs membrane), which plays a role of multiinterlayer inserting between the separator and the cathode for Li-S battery. The S/MoO2-CNFs/Li battery showed a discharge capacity of 6.93 mAh cm(-2) (1366 mAh g(-1)) in the first cycle at a current density of 0.42 mA cm(-2) and 1006 mAh g(-1) over 150 cycles. Moreover, even at the highest current density (8.4 mA cm(-2)), the battery achieved 865 mAh g(-1). The stable electrochemical behaviors of the battery has achieved because of the mesoporous and interconnecting structure of MoO2-CNFs, proving high effect for ion transfer and electron conductive. Furthermore, this MoO2-CNFs interlayer could trap the polysulfides through strong polar surface interaction and increases the utilization of sulfur by confining the redox reaction to the cathode.
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