Imidazolium‐Based Protic Ionic Liquids as Electrolytes for Lithium‐Ion Batteries

2019-03-08 19:34:51 adman 12

Monils Ionic Liquids | Monils Chemical Engineering Science & Technology (Shanghai) co., Ltd

Protic ionic liquids (PILs) have been indicated as a promising class of ionic liquids (ILs) for the realization of high‐performance lithium‐ion batteries (LIBs). In this work we synthesize four different PILs containing the imidazolium‐based cations 1,2‐Dimethylimidazolium (1,2‐DMim+) and 1‐Methylimidazolium (1‐Mim+), and the anions bis(trifluoromethanesulfonyl)imide (TFSI) and bis(fluorosulfonyl)imide (FSI). We show that these PILs display good conductivities and low viscosities and that they can be successfully used in combination with lithium iron phosphate (LFP) electrodes. Among the investigated electrolytes, 0.5 M LiTFSI in 1,2‐DMImTFSI appears as the most promising candidate for the realization of systems with high capacity retentions at high C‐rates and high cycling stabilities.