Molecular Catalysis, Catalysis Research Center and Department of Chemistry, Technische Universität München, Lichtenbergstr. 4, 85747 Garching bei München, Germany.
Phys Chem Chem Phys. 2018 Nov 28;20(46):29412-29422. doi: 10.1039/c8cp06099a.
Sodium ion batteries (SIBs) based on IL electrolytes have attracted great attention, particularly in large-scale energy storage systems for renewable energy due to the abundance of sodium and the excellent safety resulting from the use of non-flammable ionic liquid (IL) electrolytes. In this article, a series of 15 functionalized room temperature ionic liquids (RTILs) suitable as electrolytes is presented. Special emphasis was laid on the purity of the synthesized RTILs and a consistent and uniform characterization of their physicochemical properties. Evaluation of the viscosity, conductivity, and thermal and electrochemical stabilities resulted in clear structure-property relationships, rendering the ether functionalized RTILs most promising for application in SIBs. Electrochemical investigations of the ether functionalized IL electrolytes in SIB half cells (Na0.6Mn0.9Co0.1O2 as cathode material) proved their compatibility with a SIB system. Stable cycling performance was achieved with the piperidinium based RTIL IL 6 outperforming the organic electrolyte by far with a retention of 81% after 350 cycles. These results show the suitability of RTILs to enhance the performance of SIB systems and serve as a basis for the design of high performance IL electrolytes.
钠离子电池（SIBs）基于离子液体电解质引起了广泛关注，特别是在可再生能源的大规模储能系统中，因为钠的丰富性以及使用不可燃的离子液体（IL）电解质带来的优异安全性。在本文中，我们提出了一系列 15 种适用于电解质的功能化室温离子液体（RTILs）。特别强调了合成 RTILs 的纯度以及对其物理化学性质的一致和统一的表征。对粘度、电导率、热和电化学稳定性的评估得出了明确的结构-性质关系，使得醚功能化 RTILs 最有希望应用于 SIBs。SIB 半电池（Na0.6Mn0.9Co0.1O2 作为阴极材料）中醚功能化 IL 电解质的电化学研究证明了它们与 SIB 系统的兼容性。具有哌啶基的 RTIL IL 6 实现了稳定的循环性能，在 350 次循环后保留率为 81%，远远超过有机电解质。这些结果表明 RTILs 适合提高 SIB 系统的性能，并为高性能 IL 电解质的设计提供了基础。
