期刊
JOURNAL OF POWER SOURCES
卷 448, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227336
关键词
TiB2; High conductivity; Multi-functional separator; Lithium sulfur battery
资金
- National Science Foundation of China [21776245, 21476200, 511777140]
- Science and Technology Commission of Shanghai Municipality [16DZ2290300, 17DZ1200403]
- Fundamental Research Funds for the Central Universities at Tongji University [22120180519/22120180308]
- National Science Foundation of the United States [1805288]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1805288] Funding Source: National Science Foundation
A metallically conductive TiB2 is developed to construct multifunctional separator toward improved lithium-sulfur (Li-S) battery performance. Coupled with two-dimensional graphene, the obtained TiB2@G separator fulfills a synergistic combination of strong physical and chemical sulfur immobilization as well as a high-efficiency sulfur reutilization, thus establishing a robust barrier against the polysulfide shuttling and enabling a fast and durable sulfur electrochemistry. As a result, cells based on TiB2@G separator exhibit a high sulfur utilization with 1350 mA h g(-1) capacity at 0.05C, superb rate capability up to 5.0C, and excellent cyclability with a high capacity retention over 85% after 300 cycles at 0.5C. Moreover, significantly mitigated self-discharge and considerably high areal capacity of 5.8 mA h cm(-2) can be also achieved, indicating the great promise of this separator design for the development of high-performance Li-S batteries.
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