Ester Modified Pyrrolidinium Based Ionic Liquids as Electrolyte Component Candidates in Rechargeable Lithium Batteries
作者:Xia Cao、Stephan Röser、Babak Rezaeirad、Xin He、Benjamin Streipert、Martin Winter、Isidora Cekic-Laskovic
DOI:10.1002/zaac.201500554
日期:2015.11
Room temperature ionic liquids (RTILs), especially pyrrolidinium based RTILs with bis(trifluoromethane-sulfonyl)imide (TFSI) as counterion, are frequently proposed as promising electrolyte component candidates thanks to their high thermal as well as high oxidation stability. In order to avoid a resource intensive experimental approach, mainly based on trial and error experiments, a computational screening
室温离子液体 (RTIL),尤其是以双(三氟甲烷-磺酰基)亚胺(TFSI)作为抗衡离子的基于吡咯烷的 RTIL,由于其高热稳定性和高氧化稳定性,经常被认为是有前途的电解质组分候选物。为了避免资源密集型实验方法,主要基于试错实验,采用计算筛选方法预先选择合适的候选分子,并通过修饰吡咯烷 RTIL 的阳离子结构合成了三个同源系列化合物。获得的高纯度RTILs:甲基-甲基羧甲基吡咯烷鎓TFSI(MMMPyrTFSI)、甲基-乙基羧甲基吡咯烷鎓TFSI(MEMPyrTFSI)和甲基丙基羧甲基吡咯烷鎓TFSI(MPMPyrTFSI)在高于300°C时表现出优异的热稳定性。此外,MMMPyrTFSI 和 MPMPyrTFSI 表现出高达 5.4 V vs. Li/Li+ 的高氧化稳定性。在 5 V vs. Li/Li+ 下未观察到集电器的铝腐蚀。除此之外,与未修饰的 RTIL 1-丁基-1-甲基吡咯烷鎓