Journal
SMALL
Volume 16, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201905737
Keywords
bare sulfur cathodes; flame retardant; high sulfur mass loading; high temperature stability; interface stability
Categories
Funding
- National Key Research and Development Program of China [2018YFB0104300]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA22010604]
- National Natural Science Foundation of China [51625204, 51703236, U1706229]
- Key Scientific and Technological Innovation Project of Shandong [2017CXZC0505]
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Conventional lithium-sulfur batteries often suffer from fatal problems such as high flammability, polysulfide shuttling, and lithium dendrites growth. Here, highly-safe lithium-sulfur batteries based on flame-retardant electrolyte (dimethoxyether/1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether) coupled with functional separator (nanoconductive carbon-coated cellulose nonwoven) to resolve aforementioned bottle-neck issues are demonstrated. It is found that this flame-retardant electrolyte exhibits excellent flame retardancy and low solubility of polysulfide. In addition, Li/Li symmetrical cells using such flame-retardant electrolyte deliver extraordinary long-term cycling stability (less than 10 mV overpotential) for over 2500 h at 1.0 mA cm(-2) and 1.0 mAh cm(-2). Moreover, bare sulfur cathode-based lithium-sulfur batteries using this flame retardant electrolyte coupled with nanoconductive carbon-coated cellulose separator can retain 83.6% discharge capacity after 200 cycles at 0.5 C. Under high charge/discharge rate (4 C), lithium-sulfur cells still show high charge/discharge capacity of approximate to 350 mAh g(-1). Even at an elevated temperature of 60 degrees C, discharge capacity of 870 mAh g(-1) can be retained. More importantly, high-loading bare sulfur cathode (4 mg cm(-2))-based lithium-sulfur batteries can also deliver high charge/discharge capacity over 806 mAh g(-1) after 56 cycles. Undoubtedly, the strategy of flame retardant electrolyte coupled with carbon-coated separator enlightens highly safe lithium-sulfur batteries at a wide range of temperature.
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