The practical application of lithium‐sulfur batteries with high theoretical energy density and readily available cathode active materials is hampered by problems such as sulfur insulation, dramatic volume changes, and polysulfide shuttling. The targeted development of novel binders is the most industrialized solution to the problem of sulfur cathodes. Herein, an aqueous conductive emulsion binder with the sulfonate‐containing hard elastic copolymer core and the conjugate polymer shell, which is capable of forming a bicontinuous mesoscopic interpenetrating polymer network, is synthesized and investigated. Not only can the elastic skeleton formed by the copolymer bind the active substance under drastic volume changes, but also the rich ester and cyanide groups in it can effectively capture lithium polysulfide. Meanwhile, the conducting skeleton consisting of poly(3,4‐ethylenedioxythiophene) both provides the additional charge conduction pathways and acts as the redox intermediates, significantly accelerating the kinetic process of lithium polysulfide conversion. Based on the synergistic effect of the above mechanisms, the use of the prepared binder on the sulfur carbon cathode significantly improves the rate performance and cycle stability of lithium sulfur batteries.

中文翻译：

---

一种基于多硫化物捕获骨架和氧化还原中间体网络介观互穿的锂硫电池导电粘合剂


具有高理论能量密度和易于获得的正极活性材料的锂硫电池的实际应用受到硫绝缘、剧烈的体积变化和多硫化物穿梭等问题的阻碍。有针对性地开发新型粘合剂是解决硫正极问题的最工业化的解决方案。本文合成并研究了一种具有含磺酸盐硬弹性共聚物核和共轭聚合物壳的水性导电乳液粘合剂，该粘合剂能够形成双连续介观互穿聚合物网络。共聚物形成的弹性骨架不仅可以在剧烈的体积变化下结合活性物质，而且其中丰富的酯基和氰化物基团可以有效捕获多硫化锂。同时，由聚(3,4-乙烯二氧噻吩)组成的导电骨架既提供了额外的电荷传导途径，又充当氧化还原中间体，显着加速了多硫化锂转化的动力学过程。基于上述机制的协同作用，所制备的粘合剂在硫碳正极上的使用显着提高了锂硫电池的倍率性能和循环稳定性。