期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 776, 期 -, 页码 504-510出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.10.172
关键词
Li-S battery; Composite; Low-temperature performance; Capacity stability
资金
- National Natural Science Foundation of China [51672176, 21471005, 661573334]
- Major Project of the Anhui Provincial Department of Education [KJ2018ZD034]
- Creative Science Foundation of AHNU [2018XJJ108]
- Intergovernmental International Scientific and Technological Cooperation of Shanghai [17520710200]
High energy density Li-S battery has attracted broad attention; however the capacity retention is still non-ideal. The major challenge is to find a way to effectively prevent the shuttle effect of the lithium polysulfides during charging/discharging. Here, we present a novel wheel-confined composite consisting of MnO2 nano-rod as wedge and SnO2 sphere as the skeleton filled with sulfur, which was synthesized using a facile chemical method. The battery with the S@MnO2@SnO2 composite as cathode exhibits a capacity as high as 1323 mAh g(-1) at 0.1 C and a high capacity retention of only 0.03% decay per cycle over 500 cycles, which indicates a greatly reduced shuttle effect in Li-S batteries. The battery also shows good rate-performance and low-temperature properties. In addition, the I-V measurements and the first-principle calculations have demonstrated an enhanced electron transfer through the composite. (C) 2018 Elsevier B.V. All rights reserved.
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