Engineering Laboratory for Next Generation Power and Energy Storage Batteries, Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China.
School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China.
ACS Appl Mater Interfaces. 2018 Aug 8;10(31):26264-26273. doi: 10.1021/acsami.8b07316. Epub 2018 Jul 26.
Lithium-sulfur (Li-S) batteries are seriously restrained by the shuttling effect of intermediary products and their further reduction on the anode surface. Considerable researches have been devoted to overcoming these issues by introducing carbon-based materials as the sulfur host or interlayer in the Li-S systems. Herein, we constructed a multifunctional interlayer on a separator by inserting FeO nanoparticles (NPs) in a porous graphene (PG) film to immobilize polysulfides effectively. The porous structure of graphene was optimized by controlling the oxidation conditions for facilitating ion transfer. The polar FeO NPs were employed to trap sulfur species via strong chemical interaction. By exploiting the PG-FeO interlayer with optimal porous structure and component, the Li-S battery delivered a superior cycling performance and rate capability. The reversible discharge capacity could be maintained at 732 mAh g after 500 cycles and 356 mAh g after total 2000 cycles at 1 C with a final capacity retention of 49%. Moreover, a capacity of 589 mAh g could also be maintained even at 2 C rate.
锂硫（Li-S）电池受到中间产物穿梭效应及其在阳极表面进一步还原的严重限制。通过引入碳基材料作为硫主体或 Li-S 体系中的层间材料，可以克服这些问题。在此，我们通过在多孔石墨烯（PG）薄膜中插入 FeO 纳米颗粒（NPs）来构建一种在隔膜上的多功能中间层，以有效固定多硫化物。通过控制氧化条件优化石墨烯的多孔结构，以促进离子转移。通过利用具有最佳多孔结构和组成的 PG-FeO 中间层，Li-S 电池表现出优异的循环性能和倍率性能。在 1 C 下循环 500 次后，可逆放电容量可保持在 732 mAh g 后，在 2000 次总循环后，仍可保持 49%的最终容量保持率，为 49%。此外，即使在 2 C 的倍率下，也可以保持 589 mAh g 的容量。
