期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 19, 页码 16552-16560出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03201
关键词
lithium sulfide; titanium oxide; carbon nanofiber; high-rate lithium-sulfur batteries; lithium sulfide batteries
资金
- National Natural Science Foundation of China [91634111, 51774261]
- Sino-German Joint Project from the National Natural Science Foundation of China [51761135108]
- Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy, through the Advanced Battery Materials Research (BMR) Program (Battery500 Consortium)
- DOE Office of Science by UChicago Argonne, LLC [DE-AC02-06CH11357]
The high theoretical energy density of lithium-sulfur (Li-S) batteries makes them an alternative battery technology to lithium ion batteries. However, Li-S batteries suffer from low sulfur loading, poor charge transport, and dissolution of lithium polysulfide. In our study, we use the lithiated S, Li2S, as the cathode material, coupled with electrospun TiO2-impregnated hollow carbon nanofibers (TiO2-HCFs), which serve as the conductive agent and protective barrier for Li2S in Li-S batteries. TiO2-HCFs provide much improved electron/ionic conductivity and serve as a physical barrier, which prevents the dissolution of lithium polysulfides. The Li2S/TiO2-HCF composite delivers a discharge capacity of 851 mA h g(Li2S)(-1) at 0.1C and the bilayer TiO2-HCFs/Li2S/TiO2-HCF composite delivers a high specific capacity of 400 mA h g(Li2S)(-1) at 5C.
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