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- W3155592982 abstract "Lithium-sulfur (Li-S) batteries have aroused tremendous attention owning to the merits of high theoretical energy density, natural abundance, and environmental benignity. However, the notorious shuttle effect of polysulfides severely hampers the practical application of Li-S batteries. Herein, we have successfully developed N-doped-carbon-layer-enveloped CoFe alloy ([email protected]) nanoparticles, which are employed to functionize the commercial polypropylene separators for Li-S batteries. In the hybrid structure, the N-doped carbon layer provides abundant conducting pathways for ion/electron transport, while CoFe alloy offers sufficient polysulfide adsorptive and catalytic sites, which can simultaneously accelerate the multiphase conversion of sulfur/polysulfide/sulfide and suppress the polysulfide shuttling. As a consequence, the Li-S batteries assembled with [email protected] modified separators demonstrate a high sulfur utilization (high initial discharge capacity of 1264 mAh g−1 at 0.2C), high rate performance (720.1 mAh g−1 at 4C), and superior cycling stability (a low capacity decay of 0.05% per cycle after 1000 cycles at 1C). More encouragingly, even with a high sulfur loading up to 8.5 mg cm−2, a high initial areal capacity of 7.9 mAh cm−2 is achieved, with a capacity retention of 6.2 mAh cm−2 after 150 cycles, demonstrating the great potential of [email protected] for high-energy-density Li-S batteries." @default.
- W3155592982 created "2021-04-26" @default.
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- W3155592982 date "2021-10-01" @default.
- W3155592982 modified "2023-10-17" @default.
- W3155592982 title "Catalyzing polysulfide redox conversion for promoting the electrochemical performance of lithium-sulfur batteries by CoFe alloy" @default.
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- W3155592982 doi "https://doi.org/10.1016/j.cej.2021.129997" @default.
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