Abstract A novel polyvinylidene fluoride/poly(4-styrenesulfonic acid) lithium salt (PVDF/PSSLi) composite membrane has been successfully produced by a facile route. This membrane is proven to be effective for depressing polysulfide shuttle in lithium-sulfur battery, leading to higher discharge capacity and better durability in comparison with the commercial PP separator. The Li-S cell with PVDF/PSSLi separator delivers a discharge capacity of 1194 mAh/g with average Coulombic efficiency of 97% at 0.2 C. Especially, the PVDF/PSSLi membrane exhibits excellent cycling performance at 0.5 C, and the corresponding capacity decay is just 0.26% per cycle during 200 cycles, while that of PP separator is 0.43%; moreover, it possesses stable and high Coulombic efficiency of beyond 97% during cycling.

中文翻译：

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静电纺 PVDF/PSSLi 离聚物薄膜作为锂硫电池的功能性隔膜

摘要 一种新型聚偏二氟乙烯/聚（4-苯乙烯磺酸）锂盐（PVDF/PSLi）复合膜已通过简便的途径成功制备。该膜被证明可有效抑制锂硫电池中的多硫化物穿梭，与商用 PP 隔膜相比，具有更高的放电容量和更好的耐用性。带有 PVDF/PSLi 隔膜的 Li-S 电池提供 1194 mAh/g 的放电容量，0.2 C 下的平均库仑效率为 97%。特别是 PVDF/PSLi 膜在 0.5 C 下表现出优异的循环性能，以及相应的容量衰减200次循环中每循环仅为0.26%，而PP隔膜为0.43%；此外，它在循环过程中具有超过 97% 的稳定和高库仑效率。