Journal
ELECTROCHIMICA ACTA
Volume 302, Issue -, Pages 161-168Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.02.040
Keywords
Li-ion battery; Imidazolium salts; Additives; Ionic conductivity; Specific capacity
Categories
Funding
- Technology Development Program of MSS [S2624700]
- ICT development R&D program of MSIT [S2624700]
- Small and Medium Business Administration (SMBA)
- Korea Institute for Advancement of Technology (KIAT) through the World Class 300 project RD
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Herein, we report the synthesis of a novel imidazolium-based ionic salt, lithium (fluorosulfonyl) ((3-(1-methyl-1H-imidazol-3-ium-3-yl)propyl)sulfonyl) bis(fluorosulfonyl)imide (LiFSMIPFSI) as an electrolyte for the application in lithium-ion battery (LIB). The as-synthesized LiFSMIPFSI exhibited high purity and yield, which was characterized by various spectroscopic techniques. The LiFSMIPFSI electrolyte with a mixed solvent of ethylene carbonate (EC) and dimethyl sulfoxide (DMSO) (75:25 v/v) showed a wide electrochemical stability (ca. 4.5 V vs. Li/Li+) and high thermal stability (300 degrees C), good Li+ conductivity (ca. 8.02 mS/cm at 30 degrees C), and low intrinsic viscosity, which concurrently delivered a specific discharge capacity of ca. 125 mAhg(-1) at 0.1 C with the full LIB configuration of LiFePO4/electrolytes/graphite. The performance of this LiFSMIPFSI electrolyte was enhanced further by the addition of conventional lithium bis(fluoro-sulfonyl)imide (LiFSI) and lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) ionic salts (20% each) as additives with the specific discharge capacity of ca. 147 and 139 mAhg (-1), respectively, at 0.1 C. This is mainly due to the additional enhancement of Li+ conductivity and its concentrations in the electrolytes induced by the additives. The LiFSMIPFSI electrolyte with LiFSI additive based LIB showed the highest cycling stability (capacity retention ca. 97%) among the electrolytes after 500 charge-discharge cycles. Thus, the present work contributes to the development of new ionic salts and its effects upon the addition of additives on LIB performance. (C) 2019 Elsevier Ltd. All rights reserved.
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