Low-temperature Li-S batteries enabled by all amorphous con version process of organosulfur cathode  

作　　者：Zhenkang Wang Xiaowei Shen Sijie Li Yuxuan Wu Tingzhou Yang Jie Liu Tao Qian Chenglin Yan 

机构地区：[1]College of Energy,Key Laboratory of Advanced Carb on Materials and Wearable Energy Technologies of Jiangsu Province,Soochow University,Suzhou 215006,Jiangsu,China [2]College of Chemistry and Chemical Engineering.Nantong University,Seyuan 9,Nantong 226000,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2022年第1期496-502,I0013,共8页能源化学（英文版）

基　　金：support from the National Natural Science Foundations of China (grants 52071226 and 51872193);the Natural Science Foundations of Jiangsu Province (BE2020003-3 and BK20201171);the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘　　要：The high degree of crystallinity of discharging in termediates of Li-S batteries(Li_(2)S_(2)/Li_(2)S)causes a severe capacity attenuation at low temperatures.Herein,a sulfur-rich polymer is fabricated,which enables all the discharging in termediates to exist in an amorphous state without long-range order,promoti ng the substantial conversion of discharging intermediates and enhancing Li-S batteries'performance at low temperatures greatly.This cathode material exhibits excellent performance both at room and low temperatures.Even under an extremely low temperature(-40℃),the discharge capacity can remain 67% of that at room temperature.Besides,in-situ UV/Vis spectroscopy and density functional theory calculations reveal that this organosulfur cathode undergoes a new mechanism during discharge.Li_(2)S_(6) and Li_(2)S_(3) are the primary discharging intermediates that are quite different from conventional Li-S batteries.These results provide a new directi on for a broader range of applications of Li-S batteries.

关 键 词：Low temperature Organosulfur polymers Li-S battery CRYSTALLINITY 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]