Novel Pyrrolinium-based Ionic Liquids for Lithium Ion Batteries: Effect of the Cation on Physicochemical and Electrochemical Properties
作者:Hyung-Tae Kim、Oh Min Kwon、Junyoung Mun、Seung M. Oh、Taeeun Yim、Young Gyu Kim
DOI:10.1016/j.electacta.2017.04.078
日期:2017.6
enhance the safety properties of LIBs, novel pyrrolinium-based ionic liquids (ILs) were proposed as an alternative electrolyte to the current carbonate electrolyte, which have some task-specific functional groups, i.e., a planar CN double bond, a C-O ether linkage, and no unstable C-H bond, designed to improve their electrochemical performances as well as the physicochemical properties. As a result, the
锂离子电池(LIB)是最有前途的能量转换/存储系统之一,但应改善LIB中当前电解质的低热稳定性,以扩展其潜在应用。为了提高LIB的安全性,提出了一种新型的吡咯基离子液体(ILs)作为目前碳酸盐电解质的替代电解质,该电解质具有一些特定任务的官能团,即平面C N双键,CO醚连接,并且没有不稳定的CH键,旨在改善其电化学性能以及理化性质。结果,与已知IL相比,基于吡咯鎓的IL显示出大大改善的物理化学和电化学性质。在准备好的IL中,N-双烯丙基-2-甲氧基吡咯鎓双(氟磺酰基)酰亚胺(A(OMe)Pyrl-FSI,4)显示出高离子电导率(10.2 mS cm -1),非常好的循环性能(50次循环后保留率为99.3%)使用LiFePO 4电极,锂离子的转移数大大提高(0.19)。IL 4在5 C速率下还具有显着的速率能力,保留率为81.2%(124.8 mA h g -1),而在0.1 C速率下的初始放电容量为153