期刊
JOURNAL OF POWER SOURCES
卷 400, 期 -, 页码 572-579出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.08.055
关键词
alpha-MoO3 spheres; High sulfur content; Chemical adsorption; Lithium-sulfur batteries; DFT calculation
资金
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJ1709217, KJ1709199]
- Scientific Research Innovation Team of Chongqing University of Technology [cqut2015srim]
The practical applications of lithium-sulfur (Li-S) batteries remains remote because of low utilization of sulfur and short cycle life caused by low conductivity of sulfur, shuttle effect of lithium polysulfides and severe volume expansion. It is therefore exigent to rationally design an effective sulfur host. Here a novel sulfur host material alpha molybdenum trioxide (alpha-MoO3) spheres are introduced into Li-S battery cathode acting as lithium polysulfides absorbent and efficient matric of sulfur. The abundant oxygen atoms on the surface of alpha-MoO3, making it form chemical binding interactions with lithium polysulfides, which can effectively alleviate the dissolution of lithium polysulfides. Moreover, alpha-MoO3 as the matric of sulfur alleviates volume expansion of active sulfur and enhanced the utilization of sulfur, which results in improving the battery performances. As a result, S/alpha-MoO3 electrode with the sulfur content of 68 wt.% shows an initial discharge capacity of 1086.2 mAh g(-1) and good capacity retention is obtained with 912.8 mAh g(-1) after 400 cycles at 0.5 C. After 50 cycles at rates ranging from 0.1 to 2 C, the cell still returns a high specific capacity of 916.5 mAh g(-1) at 0.5 C. The results demonstrate alpha-MoO3 was a promising sulfur host material for promoting the performances of Li-S batteries with high sulfur content cathode.
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