Abstract The high theoretical capacity around 1672 mA h g−1 and the energy density of 2567 Wh kg−1and addition advantages of the low cost and environmental benignity, make lithium-sulfur batteries (LiSBs) next generation battery. However, due to restrictions on the low conductivity of sulfur and soluble polysulfides during discharge, electrochemical performance of the batteries is deteriorated. Heteroatom doped carbon as an effective strategy can improve the poor electrochemical performance caused by polysulfide shuttle. Hence, the nitrogen and oxygen dual-doped tube-like porous biomass-derived carbon from the fluffy catkins is successfully fabricated for the LiSBs. After carbonization and activation, the tube-like and unique mesoporous structure are obtained and maintained, and a high sulfur content of 82.5 wt% is achieved in tube-like activated carbon material/sulfur composites (TACM/S). The N, O dual-doping introduces more active sites and strong chemical adsorption to anchor the polysulfides, therefore remarkably ameliorating the intractable polysulfide shuttle effect and enhancing the utilization of sulfur. The electrochemical results show that the LiSBs with the TACM/S cathode exhibit high initial discharge capacities as high as 1041.7 mAh g−1 at 0.1 C, and outstanding capacity retention of about 77.5% after 500 cycles at 0.5 C with an ultralow capacity fading rate of 0.043% per cycle.

中文翻译：

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锂硫电池硫正极中生物质衍生的管状氮氧双掺杂多孔碳

摘要 1672 mAh g-1左右的高理论容量和2567 Wh kg-1的能量密度以及低成本和环境友好的优势，使锂硫电池（LiSBs）成为下一代电池。然而，由于硫和可溶性多硫化物在放电过程中电导率低的限制，导致电池的电化学性能变差。杂原子掺杂碳作为一种有效的策略可以改善多硫化物穿梭引起的电化学性能差。因此，从蓬松的柳絮中成功制备了氮氧双掺杂管状多孔生物质衍生碳用于 LiSB。碳化活化后，获得并保持了管状独特的介孔结构，硫含量高达82。在管状活性炭材料/硫复合材料 (TACM/S) 中实现了 5 wt%。N、O双掺杂引入了更多的活性位点和强化学吸附来锚定多硫化物，从而显着改善了难处理的多硫化物穿梭效应，提高了硫的利用率。电化学结果表明，带有 TACM/S 正极的 LiSBs 在 0.1 C 下表现出高达 1041.7 mAh g-1 的高初始放电容量，在 0.5 C 下循环 500 次后具有约 77.5% 的出色容量保持率，且容量衰减率超低每个周期为 0.043%。从而显着改善难处理的多硫化物穿梭效应，提高硫的利用率。电化学结果表明，带有 TACM/S 正极的 LiSBs 在 0.1 C 下表现出高达 1041.7 mAh g-1 的高初始放电容量，在 0.5 C 下循环 500 次后具有约 77.5% 的出色容量保持率，且容量衰减率超低每个周期为 0.043%。从而显着改善难处理的多硫化物穿梭效应，提高硫的利用率。电化学结果表明，带有 TACM/S 正极的 LiSBs 在 0.1 C 下表现出高达 1041.7 mAh g-1 的高初始放电容量，在 0.5 C 下循环 500 次后具有约 77.5% 的出色容量保持率，且容量衰减率超低每个周期为 0.043%。