一种富硫有机聚合材料作为锂-硫电池正极的研究

Sulfur-rich organic polymer used as cathode material for lithium-sulfur battery

采用热熔法在185℃下使单质硫(S_(8))发生开环反应得到线性硫,然后再与有机材料双环戊二烯(DCPD)进行耦合,使线性硫接枝到双环戊二烯上,得到新型富硫的有机聚合材料(S-DCPD)。通过核磁、拉曼、X射线衍射和x射线光电子能谱表征证实单质硫接枝到双环戊二烯上面。这种以化学键方式固定单质硫的方法,有效地缓解了锂-硫电池中的“穿梭效应”问题。合成了一系列具有不同硫含量的S-DCPD材料,其中60%硫含量的S-DCPD综合电化学性能最优,库仑效率达到98%以上。

A novel sulfur-rich organic polymer S-dicyclopentadiene(S-DCPD)was obtained by ring-opening reaction of elemental sulfur(S_(8)) at 185℃followed by the coupling reaction with organic material dicyclopentadiene(DCPD).Characterization of NMR,Raman,XRD and XPS showed that the elemental sulfur was well grafted onto the host of DCPD.This method of fixing the elemental sulfur by chemical bond had alleviated the“shuttle effect”in lithium-sulfur batteries.A series of S-DCPD materials with different sulfur content were synthesized,among which the S-DCPD sample with the content of 60%sulfur exhibited the best comprehensive electrochemical performances,the coulombic efficiency exceeded 98%.