The performance of Li–S batteries is limited largely by the properties of the available sulfur electrodes. Here we report a novel composite sulfur electrode composed of organic polysulfane grafted directly on mesoporous graphene. Compared with sulfur chain based conventional organosulfur electrodes, the well-defined organic polysulfane with carbon skeleton has excellent structural stability during electrochemical cycling. Further, the mesopores on graphene sheets in this unique architecture can serve as channels to effectively facilitate rapid ion transport, leading to excellent battery performance. When tested as a free-standing electrode in a Li–S battery, the composite electrode demonstrates high capacity (1045 mAh/g at 1 C), superior rate capability (723 mAh/g at 20 C), excellent cycling stability (capacity retention of 95.3% after 1000 cycles at 5 C). The electrode materials still present good electrochemical performance even under high mass loading of sulfur (up to 20.3 mg/cm²). The remarkable electrochemical performance is attributed to the high structural stability and excellent electrical conductivity of the carbon skeleton and to the porous architecture of electrode that promotes fast ion transport. The greatly enhanced capacity and durability of the composite electrode make it ideally suited for the next-generation high-performance Li–S batteries.

锂硫电池的性能在很大程度上受到可用硫电极性能的限制。在这里，我们报告了一种新颖的复合硫电极，该电极由直接接枝在介孔石墨烯上的有机聚砜组成。与基于硫链的常规有机硫电极相比，具有明确骨架的具有碳骨架的有机聚硫烷在电化学循环过程中具有出色的结构稳定性。此外，在这种独特架构中，石墨烯片上的中孔可以充当通道，有效促进离子的快速迁移，从而带来出色的电池性能。当作为锂电池中的独立电极进行测试时，复合电极表现出高容量（1 C时为1045 mAh / g），出色的倍率容量（20 C时为723 mAh / g），出色的循环稳定性（容量保持率） 95。在5 C下1000次循环后为3％）。电极材料即使在高质量硫含量（高达20.3 mg / cm）下仍具有良好的电化学性能。²）。出色的电化学性能归因于碳骨架的高结构稳定性和出色的导电性，以及促进快速离子传输的电极的多孔结构。复合电极的容量和耐用性大大提高，非常适合下一代高性能Li–S电池。