FTIR characterization of PEO + LiN(CF3SO2)2 electrolytes

FTIR characterization of PEO + LiN(CF3SO2)2 electrolytes

TitleFTIR characterization of PEO + LiN(CF3SO2)2 electrolytes
Publication TypeJournal Article
Year of Publication1996
AuthorsShi-Jie Wen, Thomas J Richardson, Dania I Ghantous, Kathryn A Striebel, Philip N Ross, Elton J Cairns
JournalJournal of Electroanalytical Chemistry
Volume408
Issue1-2
Pagination113-118
Date Published05/1996
ISSN15726657
Keywordsftir, Lithium trifluoromethanesulfonimide, polyethylene oxide, thin films
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”.

DOI10.1016/0022-0728(96)04536-6
Short TitleJournal of Electroanalytical Chemistry