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FTIR characterization of PEO + LiN(CF₃SO₂)₂ electrolytes

Publication Type

Journal Article

Date Published

05/1996

Authors

Wen, Shi-Jie, Thomas J. Richardson, Dania I. Ghantous, Kathryn A. Striebel, Philip N. Ross, Elton J. Cairns

DOI

10.1016/0022-0728(96)04536-6

Abstract

FTIR transmission spectra of thin films of polyethylene oxide (PEO) + lithium trifluoromethanesulfonimide (LiN(CF₃SO₂)₂, LiTFSI) mixtures have been obtained for ethylene oxideLi ratios from 64:1 to 2:1. The phase information from these spectra is compared with the reported phase diagrams based on thermal measurements. The infrared spectrum of LiTFSI is assigned by analogy with those of related compounds. Using the spectral subtraction technique, the effects of Li⁺ solvation on the PEO matrix and of ion pairing and aggregate formation on the TFSI anion are revealed. An explanation is offered for the variation in ionic conductivity for compositions within the “crystallinity gap”.

Journal

Journal of Electroanalytical Chemistry

Volume

408

Year of Publication

1996

Issue

1-2

ISSN

15726657

Organization

Energy Storage Group, Energy Storage and Distributed Resources Division, Battery Group

FTIR characterization of PEO + LiN(CF3SO2)2 electrolytes