Cyanoethyl cellulose-based eutectogel electrolyte enabling high-voltage-tolerant and ion-conductive solid-state lithium metal batteries

作     者：Hao Zhang Lixue Zhou Xiaofan Du Jianjun Zhang Songwei Tian Tingting Liu Jinning Zhang Sijia Hu Weiling Song Xinhong Zhou Guanglei Cui Hao Zhang;Lixue Zhou;Xiaofan Du;Jianjun Zhang;Songwei Tian;Tingting Liu;Jinning Zhang;Sijia Hu;Weiling Song;Xinhong Zhou;Guanglei Cui

作者机构：Qingdao Industrial Energy Storage Research InstituteQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdaoShandongPR China College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdaoShandongPR China School of Chemical EngineeringUniversity of Chinese Academy of SciencesBeijingPR China 

出 版 物：《Carbon Energy》 (碳能源（英文）)

年 卷 期：2022年第4卷第6期

页      面：1093-1106页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52073298,U1706229,52072195) the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA21070304) the Youth Innovation Promotion Association of CAS(2020217) 

主　　题：cyanoethyl cellulose eutectogel high voltage solid-state lithium metal battery stable interfacial chemistry 

摘      要：Solid-state polymer electrolytes are an important factor in the deployment of highsafety and high-energy-density solid-state lithium metal ***,use of the traditional polyethylene oxide-based solid-state polymer electrolyte is limited due to its inherently low ionic conductivity and narrow electrochemical stability ***,for the first time,we specifically designed a cyanoethyl cellulosein-deep eutectic solvent composite eutectogel as a promising candidate for hybrid solid-state polymer *** is found that the proposed eutectogel electrolyte achieves high ionic conductivity(1.87×10^(−3) S cm^(−1) at 25℃),superior electrochemical stability(up to 4.8 V),and outstanding lithium plating/striping behavior(low overpotential of 0.04 V at 1mAcm^(−2) and 1mAh cm^(−2) over 300 h).With the eutectogel-based solid-state polymer electrolyte,a 4.45 V LiCoO_(2)/Li metal battery delivers prominent long-term lifespan(capacity retention of 85%after 200 cycles)and high average Coulombic efficiency(99.5%)under ambient conditions,significantly outperforming the traditional carbonate-based liquid *** work demonstrates a promising strategy for designing eutectogel-based solid-state polymer electrolytes to realize high-voltage and high-energy lithium metal batteries.