Insight into the reaction mechanism of sulfur chains adjustable polymer cathode for high-loading lithium-organosulfur batteries |
| |
作者姓名: | Jinqiu Zhou Xi Zhou Yawen Sun Xiaowei Shen Tao Qian Chenglin Yan |
| |
作者单位: | Soochow Institute for Energy and Materials Innovations;Institute of Chemical Industry of Forestry Products |
| |
基金项目: | 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(Li2S)or lithium disulfide(Li2S2)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 |
本文献已被 维普 等数据库收录! |