writer：Zhao-Yan Zhu, Na Yang, Xiao-Shuan Chen, Si-Chong Chen, Xiu-Li Wang, Gang Wu*, and Yu-Zhong Wang
keywords：lithium-sulfur batteries，high-performance，safety，micro/nanostructure，multifunctional composites，ball-milling
source：期刊
specific source：ACS Appl. Mater. Interfaces
Issue time：2018年
lithium-sulfur (Li-S) battery has been regarded as one of most promising energy-storage systems to meet requirements for high-energy-density in electric vehicles, advanced portable electronic devices, and so on. However, practical application of Li-S battery is restricted severely by easy dissolution of lithium polysulfides and high ?ammability of sulfur. Herein, we developed, for the first time, a multifunctional composite directly prepared by facile, green, low-cost and large-scale ball-milling method with fly ash and sulfur. Due to unique microstructure and sulfur-related components as chemical anchors, composites possessed good electron/ion transport, favorable resistance to volume change of sulfur, and strongly chemical affinity to polysulfides, which greatly facilitate redox kinetics, maintain structural integrity of cathode, and suppress polysulfide shuttling in electrolyte, hence significantly boosting electrochemical performance of Li-S battery with high initial discharge capacity, superior cycling stability, and satisfying rate capability. Typically, Li-S batteries based on composite with sulfur loading of 86.9% present initial discharge capacities of 969.8, 894.3 and 769.7 mAh g-1 as well as capacity decay rates of 0.068% (400 cycles), 0.1% and 0.042% per cycle (200 cycles) at 0.2 C, 0.5 C and 1 C, respectively. Moreover, average specific self-extinguishing time of composite-based cathode was clearly reduced to less than half of that of the pristine sulfur-based cathode, indicating signi?cantly promoting safety of battery.