Insight into the reaction mechanism of sulfur chains adjustable polymer cathode for high-loading lithium-organosulfur batteries  

作　　者：Jinqiu Zhou Xi Zhou Yawen Sun Xiaowei Shen Tao Qian Chenglin Yan 

机构地区：[1]Soochow Institute for Energy and Materials Innovations,College of Energy,Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province,Soochow University,Suzhou 215006,Jiangsu,China [2]Institute of Chemical Industry of Forestry Products,Chinese Academy of Forestry,Nanjing 210042,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2021年第5期238-244,共7页能源化学（英文版）

基　　金：support from the National Natural Science Foundations of China(grants 51622208,21703149,and 51872193);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。

摘　　要：Small molecules with adjustable sulfur atoms in the confined structure were acted as precursor for the synthesis of polymer cathodes for lithium-organosulfur batteries.Among them,poly(diallyl tetrasulfide)(PDATtS)delivered a high capacity of 700 mAh g^(-1),stable capacity retention of 85%after 300 cycles,high areal capacity~4 m Ah cm^(-2) for electrode with up to 10.3 mg cm^(-2) loading.New insight into the reaction mechanism of PDATtS electrode that radicals arisen from the homolytic cleavage of S-S bond in PDATtS reacted with Li+to generate thiolates(RSLi)and insoluble lithium sulfides(Li_(2)S)or lithium disulfide(Li_(2)S_(2))was clearly verified by in-situ UV/Vis spectroscopy,nuclear magnetic resonance(NMR)studies and density-functional theory(DFT)calculations.Therefore,based on the unique reaction mechanism,problems of rapid capacity fading due to the formation of soluble polysulfide intermediates and their serious shuttle effect in conventional lithium-sulfur(Li-S)batteries was totally avoided,realizing the dendrite-free lithium sulfur batteries.This study sets new trends for avenues of further research to advance Li-S battery technologies.

关 键 词：Lithium-sulfur battery Organosulfur polymer Adjustable sulfur chains Cathode material 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]