Synthesis of an imidazolium functionalized imide based electrolyte salt and its electrochemical performance enhancement with additives in li-ion batteries

Add time:07/12/2019    Source:sciencedirect.com

This research demonstrates the synthesis of an imidazolium functionalized imide based electrolyte salt, lithium (fluorosulfonyl)((3-(1-methyl-1H-imidazol-3-ium-3-yl)propyl)sulfonyl)imide) bis(trifluorosulfonyl)imide (LiFSMIPTFSI) for the development of lithium-ion battery (LIB). The LiFSMIPTFSI electrolyte with a mix-solvent of ethylene carbonate (EC) and dimethyl sulfoxide (DMSO) (75:25 v/v) shows high electrochemical oxidative stability (up to 5.3 V vs. Li/Li+), good Li+ conductivity (ca. 6.10 mS/cm at 30 °C) and transference number (ca. 0.55), and low viscosity, which concurrently provide a specific capacity of ca. 141 mAhg−1 at 0.1 C with a full LIB structure of LiFePO4/LiFSMIPTFSI/graphite. The electrochemical performance of this electrolyte is enhancing additionally by adding conventional imide salts (lithium bis(fluoro-sulfonyl)imide (LiFSI) and lithium bis(trifluoromethylsulfonyl)imide (LiTFSI)) (20% each) as additives with the specific capacity of ca. 160 and 150 mAhg−1, respectively, at 0.1 C. This is mainly due to the additional enhancement of Li+ conductivity and transference number of the LiFSMIPTFSI electrolyte induce by the additives. The LiFSMIPTFSI electrolyte with LiFSI additive based LIB shows the maximum capacity retention of ca. 95.50% among the electrolytes after 500 charge-discharge cycles, along with high coulombic efficiency (98.50%).

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