Mo2C-Embedded Carambola-like N,S-Rich Carbon Framework as the Interlayer Material for High-Rate Lithium–Sulfur Batteries in a Wide Temperature Range

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Abstract
The insulating nature of sulfur/Li2S and heavy shuttle effect of lithium polysulfides (LiPSs) hinder the commercialization of lithium-sulfur (Li-S) batteries. To address such issues, we designed and synthesized a porous carambola-like N,S-doped carbon framework embedded with Mo2C particles (designed as N,S-Mo2C/C-ACF) as interlayer material to block polysulfides shuttle and behave as a catalytic reactor for LiPSs conversion. The modified separator of polypropylene (PP) functionalized by N,S-Mo2C/C-ACF, showing ultrafast wetting ability to electrolyte and high lithium ions (Li+) conductivity, proves to be highly effective for inhibiting polysulfides shuttle and simultaneously promoting the reutilization of adsorbed LiPSs. When used in Li-S batteries by coupling with Super P/sulfur cathode, over a wide temperature range of 5 to 55 °C, the as-fabricated batteries delivered excellent rate capability and long cycle stability. Especially, with high rate of 5 C, discharge capacities of 405, 630 and 670 mAh gs-1 were achieved when tested at 5, 30, and 55 ℃, respectively. The remarkable wide-temperature performance is appealing for extended practical application of Li-S batteries.
Funding Information
  • National Natural Science Foundation of China (21805018, 21805198, 21878195)
  • Chinese Academy of Sciences (51772296)
  • State Key Laboratory of Biochemical Engineering, Chinese Academy of Sciences

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