期刊
ADVANCED MATERIALS
卷 32, 期 37, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202003012
关键词
additives; lithium metal anodes; lithium-sulfur batteries; polysulfides; solid electrolyte interphase
类别
资金
- Beijing Natural Science Foundation [L182021]
- National Natural Science Foundation of China [21776019, 21808124]
- National Key Research and Development Program [2016YFA0202500]
- Scientific and Technological Key Project of Shanxi Province [20191102003]
The lithium-sulfur (Li-S) battery is regarded as a promising high-energy-density battery system, in which the dissolution-precipitation redox reactions of the S cathode are critical. However, soluble Li polysulfides (LiPSs), as the indispensable intermediates, easily diffuse to the Li anode and react with the Li metal severely, thus depleting the active materials and inducing the rapid failure of the battery, especially under practical conditions. Herein, an organosulfur-containing solid electrolyte interphase (SEI) is tailored for the stabilizaiton of the Li anode in Li-S batteries by employing 3,5-bis(trifluoromethyl)thiophenol as an electrolyte additive. The organosulfur-containing SEI protects the Li anode from the detrimental reactions with LiPSs and decreases its corrosion. Under practical conditions with a high-loading S cathode (4.5 mg(S)cm(-2)), a low electrolyte/S ratio (5.0 mu L mg(S)(-1)), and an ultrathin Li anode (50 mu m), a Li-S battery delivers 82 cycles with an organosulfur-containing SEI in comparison to 42 cycles with a routine SEI. This work provokes the vital insights into the role of the organic components of SEI in the protection of the Li anode in practical Li-S batteries.
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