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- W2999804912 abstract "Abstract 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 ≈350 mAh g −1 . Even at an elevated temperature of 60 °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." @default.
- W2999804912 created "2020-01-23" @default.
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- W2999804912 date "2020-01-09" @default.
- W2999804912 modified "2023-10-17" @default.
- W2999804912 title "Highly Safe Electrolyte Enabled via Controllable Polysulfide Release and Efficient Conversion for Advanced Lithium–Sulfur Batteries" @default.
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- W2999804912 doi "https://doi.org/10.1002/smll.201905737" @default.
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