期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 17, 页码 10346-10353出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta01598a
关键词
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资金
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170817110251498]
- Guangdong Special Support for the Science and Technology Leading Young Scientist [2016TQ03C919]
- National Natural Science Foundation of China [51672230, 21603094]
- CityU Applied Research Grant [ARG 9667159]
- National Science Foundation [1803256]
- Hubei Provincial Department of Education
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1803256] Funding Source: National Science Foundation
The shuttling of polysulfides with sluggish redox kinetics has severely retarded the advancement of lithium-sulfur Li-S) batteries. In this work oxygen-deficient titanium dioxide (TiO2) has been investigated as a novel functional host for Li-S batteries. Experimental and first-principles density functional theory (DFT) studies reveal that oxygen vacancies (V-o) help to reduce polysulfide shuttling and catalyze the redox kinetics of sulfur/polysulfides during cycling. Consequently, the resulting TiO2/S composite cathode manifests superior electrochemical properties in terms of high capacity (1472 mA h g(-1) at 0.2C), outstanding rate capability (571 mA h g(-1) at 2C), and excellent cycling properties (900 mA h g(-1) over 100 cycles at 0.2C). The present strategy offers a viable way through vacancy engineering for the design and optimization of high-performance electrodes for advanced Li-S batteries and other electrochemical devices.
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