Abstract Lithium-sulfur (Li-S) batteries have the theoretical energy density up to 2600 Wh/kg, but its commercialization is limited by poor cyclic performance, low coulombic efficiency and high material cost. In this work, the polar cross-linked polystyrene/sulfur (PCP/S) composite with a sulfur content of 58 wt% is firstly synthesized as the cathodes for Li-S batteries, in which these polar cross-linked polystyrene agents effectively adsorb polysulfides with a large specific surface area and various functional groups, resulting in an enhancement of the cycle performance and coulombic efficiency for Li-S batteries. The first specific discharge capacity of the PCP/S cathode is 1309.7 mAh g−1 at 0.2 C, which can remain as high as 659.7 mAh g−1 after 400 cycles with a low capacity decay of 0.124% per cycle.

中文翻译：

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极性交联聚苯乙烯作为多硫化物锚定增强锂硫电池的循环性能和库仑效率

摘要 锂硫（Li-S）电池的理论能量密度高达2600 Wh/kg，但循环性能差、库仑效率低和材料成本高，限制了其商业化。在这项工作中，首先合成硫含量为 58 wt% 的极性交联聚苯乙烯/硫 (PCP/S) 复合材料作为锂硫电池的正极，其中这些极性交联聚苯乙烯试剂有效吸附多硫化物具有较大的比表面积和各种官能团，从而提高了锂硫电池的循环性能和库仑效率。PCP/S 正极的首次放电比容量为 1309.7 mAh g-1，0.2 C，400 次循环后可保持高达 659.7 mAh g-1，每次循环的容量衰减为 0.124%。