A hybrid lithium sulfonated polyoxadiazole derived single-ion conducting gel polymer electrolyte enabled effective suppression of dendritic lithium growth  

作　　者：Dazhe Li Longbo Luo Jiadeng Zhu Haimei Qin Pengqing Liu Zhaomei Sun Yi Lei Mengjin Jiang 

机构地区：[1]College of Polymer Science&Engineering,Sichuan University,Chengdu 610065,China [2]Chemical Sciences Division,Oak Ridge National Laboratory,Oak Ridge,TN 37831,United States [3]State Key Laboratory for Physical Chemistry of Solid Surfaces,Fujian Provincial Key Lab of Theoretical and Computational Chemistry,and College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China

出　　处：《Chinese Chemical Letters》2022年第2期1025-1031,共7页中国化学快报（英文版）

基　　金：supported by the Fundamental Research Funds for Central Universities of China and the Key Research and Development Projects of Sichuan (No.2020YFG0127)。

摘　　要：Lithium metal is deemed as an ideal anode material in lithium-ion batteries because of its ultrahigh theoretical specific capacity and the lowest redox potential.However,the rapid capacity attenuation and inferior security resulting from the dendritic lithium growth severely limit its commercialization.Herein a novel hybrid gel polymer electrolyte (GPE) based on electrospun lithium sulfonated polyoxadiazole (LiSPOD) nanofibrous membrane swelled by lithium bis(trifluoromethanesulfonyl)imide (Li TFSI) ether liquid electrolyte is proposed to address the issue of lithium dendrites.The Li-SPOD membrane synthesized by a simple one-pot method exhibits excellent mechanical strength and thermal resistance due to its high molecular weight and rigid backbone.The electron-withdrawing oxadiazole ring and oxadiazole ring-Li;complex,and N,O heteroatoms with lone pairs of electrons in Li-SPOD macromolecular chains facilitate the dissociation of-SO_(3)Li group and Li^(+)transference.The hybrid Li-SPOD GPE exhibits both a high lithium-ion transference number (0.64) and high ionic conductivity (2.03 m S/cm) as well as superior interfacial compacity with lithium anodes.The Li Fe PO_(4)-Li cell using this novel GPE can operate steadily at 2C for 300 cycles,remaining a high discharge capacity of 125 m Ah/g and dendrite-free anode.Remarkable performance improvements for the Li-Li and Cu-Li cells are also presented.

关 键 词：Polyoxadiazole sulfonate Single-ion conductor Gel polymer electrolyte Lithium dendrite Lithium metal battery 

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]