用于电池应用的新型基于鏻的离子液体电解质。

Novel Phosphonium-Based Ionic Liquid Electrolytes for Battery Applications.

作者信息

Hofmann Andreas, Rauber Daniel, Wang Tzu-Ming, Hempelmann Rolf, Kay Christopher W M, Hanemann Thomas

机构信息

Institute for Applied Materials, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.

Department of Chemistry, Saarland University, Campus B2.2, 66123 Saarbrücken, Germany.

出版信息

Molecules. 2022 Jul 24;27(15):4729. doi: 10.3390/molecules27154729.

DOI:10.3390/molecules27154729

PMID:35897904

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9329924/

Abstract

In this study, we address the fundamental question of the physicochemical and electrochemical properties of phosphonium-based ionic liquids containing the counter-ions bis(trifluoromethanesulfonyl)imide ([TFSI]) and bis(fluorosulfonyl)imide ([FSI]). To clarify these structure-property as well as structure-activity relationships, trimethyl-based alkyl- and ether-containing phosphonium ILs were systematically synthesized, and their properties, namely density, flow characteristics, alkali metal compatibility, oxidative stability, aluminum corrosivity as well as their use in Li-ion cells were examined comprehensively. The variable moiety on the phosphonium cation exhibited a chain length of four and five, respectively. The properties were discussed as a function of the side chain, counter-ion and salt addition ([Li][TFSI] or [Li][FSI]). High stability coupled with good flow characteristics were found for the phosphonium IL [P1114][TFSI] and the mixture [P1114][TFSI] + [Li][TFSI], respectively.

摘要

在本研究中，我们探讨了含有双（三氟甲磺酰）亚胺（[TFSI]）和双（氟磺酰）亚胺（[FSI]）抗衡离子的鏻基离子液体的物理化学和电化学性质这一基本问题。为了阐明这些结构-性质以及结构-活性关系，系统合成了基于三甲基的含烷基和醚的鏻离子液体，并全面研究了它们的性质，即密度、流动特性、碱金属相容性、氧化稳定性、铝腐蚀性以及它们在锂离子电池中的应用。鏻阳离子上的可变部分分别呈现出四个和五个的链长。这些性质作为侧链、抗衡离子和盐添加量（[Li][TFSI]或[Li][FSI]）的函数进行了讨论。分别发现鏻离子液体[P1114][TFSI]以及混合物[P1114][TFSI] + [Li][TFSI]具有高稳定性和良好的流动特性。