Structurally tunable characteristics of ionic liquids for optimizing lithium plating/stripping via electrolyte engineering

作     者：Shihan Qi Jiandong Liu Jian He Huaping Wang Mingguang Wu Daxiong Wu Junda Huang Fang Li Xin Li Yurong Ren Jianmin Ma Shihan Qi;Jiandong Liu;Jian He;Huaping Wang;Mingguang Wu;Daxiong Wu;Junda Huang;Fang Li;Xin Li;Yurong Ren;Jianmin Ma

作者机构：School of Physics and ElectronicsHunan UniversityChangsha 410082HunanChina School of Materials Science and EngineeringJiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringChangzhou UniversityChangzhou 213164JiangsuChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第12期

页      面：270-277,I0006页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (No. 51971090) 

主　　题：Electrolyte chemistry Ionic liquids Solvation structure Lithium anode Solid electrolyte interphase 

摘      要：Electrolyte chemistry offers the opportunity to regulate the solid electrolyte interphase(SEI) and Li^(+)solvation,which is considered to be crucial to the growth of lithium crystals for safe lithium metal batteries(LMBs).Structurally tunable characteristics of ionic liquids(ILs) from anion type,cationic substituent chain length and cationic substituents,will contribute this ***,we explore the influence mechanism of imidazole-based ILs as electrolyte additives on Li+solvation and the formation of *** can participate into the formation of efficient SEI,together with cathode electrolyte interphase(CEI).Moreover,ILs can also regulate the sheath structure of Li^(+)solvation,to fasten the kinetics of ***,the imidazole-based cations with long alkyl chain can form an electrostatic shield around newly formed Li nucleus,and suppress further Li plating at this *** the optimized condition,the 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide([OMIm]TFSI) additive shows the best ability to enhance the electrochemical performance,endowing the Li||Li symmetric cell with a stable life(over800 h) at 0.5 mA cm^(-2) and the Li||LiNi_(0.6)Mn_(0.2)Co_(0.2)O_(2)(NMC622) full cell with a high capacity of 141.7 mAh g^(-1) after 200 cycles at 0.5 C.