Novel bis(fluorosulfonyl)imide-based and ether-functionalized ionic liquids for lithium batteries with improved cycling properties

被引:32
作者
Tsurumaki, Akiko [1 ]
Ohno, Hiroyuki [2 ,3 ]
Panero, Stefania [1 ]
Navarra, Maria Assunta [1 ]
机构
[1] Sapienza Univ Rome, Dept Chem, Piazzale Aldo Moro 5, I-00185 Rome, Italy
[2] Tokyo Univ Agr & Technol, Dept Biotechnol, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan
[3] Tokyo Univ Agr & Technol, Grad Sch Engn, Funct Ion Liquid Labs, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan
基金
日本学术振兴会;
关键词
Ionic liquids; Lithium ion batteries; Safety; Ether functionalizations; Bis(fluorosulfonyl)imide; PHYSICOCHEMICAL PROPERTIES; ELECTROLYTES; CHALLENGES; ANION;
D O I
10.1016/j.electacta.2018.09.205
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Novel ionic liquids (ILs), which were functionalized with ether oxygens to suppress crystallization and with bis(fluorosulfonyl) imide (FSI) anions to improve ionic conductivity, were synthesized and compared. Electrolyte mixtures were prepared by adding LiFSI to N-ethoxyethyl-N-methylpiperidinium FSI ([P-1,P-2O2][FSI]) and N-ethoxyethyl-N-methylmorpholinium FSI ([M-1,M-2O2][FSI]) in ratio of 1: 9 (mol/mol). The electrolyte mixtures were found to exhibit a glass transition temperature between -71 and -93 degrees C and a decomposition temperature higher than 266 degrees C. Between these temperatures, the electrolytes were ion conductive and thermally stable liquids. [P-1,P-2O2][FSI]-LiFSI exhibited a wider electrochemical stability window and possessed an ability to form solid electrolyte interfaces having a lower resistance compared to [M-1,M-2O2][FSI]-LiFSI. Based on these results, the Li vertical bar LiFePO4 cells containing [P-1,P-2O2][FSI]-LiFSI as electrolytes were assembled and found to possess a high capacity, reaching to the nominal capacity 150 mAh g(-1) at C/10. Moreover, the cell retained flat potential profiles throughout 50 cycles. (c) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:160 / 165
页数:6
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