Mechanism of high Li-ion conductivity in poly(vinylene carbonate)-poly(ethylene oxide)cross-linked network based electrolyte revealed by solid-state NMR  

作　　者：Fan Li Tiantian Dong Yi Ji Lixin Liang Kuizhi Chen Huanrui Zhang Guanglei Cui Guangjin Hou 

机构地区：[1]State Key Laboratory of Catalysis,Dalian National Laboratory for Clean Energy,Collaborative Innovation Center of Chemistry for Energy Materials,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Qingdao Industrial Energy Storage Research Institute,Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,Shandong,China

出　　处：《Journal of Energy Chemistry》2024年第6期377-383,I0010,共8页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.22325405,22321002,22279153);Liaoning Revitalization Talents Program(XLYC1807207,XLYC2203134);DICP I202104。

摘　　要：Solid polymer electrolytes(SPEs)have become increasingly important in advanced lithium-ion batteries(LIBs)due to their improved safety and mechanical properties compared to organic liquid electrolytes.Cross-linked polymers have the potential to further improve the mechanical property without trading off Li-ion conductivity.In this study,focusing on a recently developed cross-linked SPE,i.e.,the one based on poly(vinylene carbonate)-poly(ethylene oxide)cross-linked network(PVCN),we used solid-state nuclear magnetic resonance(NMR)techniques to investigate the fundamental interaction between the chain segments and Li ions,as well as the lithium-ion motion.By utilizing homonuclear/heteronuclear correlation,CP(cross-polarization)kinetics,and spin-lattice relaxation experiments,etc.,we revealed the structural characteristics and their relations to lithium-ion mobilities.It is found that the network formation prevents poly(ethylene oxide)chains from crystallization,which could create sufficient space for segmental tumbling and Li-ion co nductio n.As such,the mechanical property is greatly improved with even higher Li-ion mobilities compared to the poly(vinylene carbonate)or poly(ethylene oxide)based SPE analogues.

关 键 词：ssNMR Lithium-ion mobility CROSS-LINK Solid polymer electrolyte 

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