期刊
ELECTROCHIMICA ACTA
卷 292, 期 -, 页码 779-788出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.09.191
关键词
Li-S batteries; 2D TiS2 nano-sheets; Cathode additives
资金
- U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy under the Advanced Battery Materials Research (BMR) program [DE-SC0012704]
- DOE, Office of Basic Energy Sciences [DE-SC0012704]
As a multifunctional cathode additive, TiS2 has been used in Li-S batteries to promote sulfur utilization and improve cell cycle life. The improvement of Li-S cell electrochemical performance in the presence of TiS2 has been attributed to the ability of TiS2 in adsorbing polysulfide. To maximize the interaction between polysulfides and TiS2, the 2-dimensional (2D) TiS2 nano-sheets with highly exposed TiS2 surface area has been successfully synthesized by a two-step sonication synthetic procedure. The 2D TiS2 particles are micron size in the basal plane direction and are nano-sized along the c-axis direction. 2D TiS2 nano-sheets may adsorb polysulfides more effectively than the raw TiS2 powder. Li-S cells with 2D TiS2 nano-sheets additive exhibit better discharge rate capability and significantly reduced capacity-fading after a long term cell cycling. This improvement can be partially attributed to the uniform distribution of 2D TiS2 nano-sheets particles within the sulfur cathode matrix, which induces more uniform sulfur and lithium sulfide deposition during the cell charge and discharge. (C) 2018 Elsevier Ltd. All rights reserved.
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