Löwe Robert, Hanemann Thomas, Zinkevich Tatiana, Hofmann Andreas
Institute for Applied Materials, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.
Department of Microsystems Engineering, University of Freiburg, Georges-Köhler-Allee 102, D-79110 Freiburg, Germany.
Polymers (Basel). 2021 Mar 4;13(5):792. doi: 10.3390/polym13050792.
Eight new polymerized ammonium-based ionic liquids were prepared as thin membrane films and evaluated within the scope of their usage in lithium-ion batteries. The focus of this work is to get a better understanding of the influence of structural modifications of the monomers on the polymerized materials. Further, different concentrations of a lithium-ion conducting salt were applied in order to receive an optimized combination of monomer structure and lithium salt concentration. It was found that an increased side chain length of the studied ammonium-based polymerized ionic liquids leads to a reduction in glass transition temperatures and increased ionic conductivity values. As a result of the addition of conducting salt to the PIL membranes, the glass transition temperatures and the ionic conductivity values decreases. Nevertheless, PFG-NMR reveals a higher lithium-ion mobility for a sample with higher conducting salt content.
制备了八种新型聚合铵基离子液体作为薄膜，并在锂离子电池的应用范围内对其进行了评估。这项工作的重点是更好地理解单体结构修饰对聚合材料的影响。此外，应用了不同浓度的锂离子传导盐，以获得单体结构和锂盐浓度的优化组合。研究发现，所研究的铵基聚合离子液体侧链长度增加会导致玻璃化转变温度降低和离子电导率值增加。向PIL膜中添加传导盐后，玻璃化转变温度和离子电导率值降低。然而，脉冲场梯度核磁共振（PFG-NMR）显示，具有较高传导盐含量的样品具有更高的锂离子迁移率。
