The behavior of Li and Mg ions in a polymerized ionic liquid

A polymerized ionic liquid was prepared using 1,3-dibromopropane reacted with 2-methylimidazole, via a two-step synthetic process. Molecular weight analysis via gel permeation chromatography indicated a Mn of 32,600g/mol. An anion exchange is performed to replace the bromide anion of poly(1-propyl-2...

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Bibliographic Details
Published in:Electrochimica acta 2012-06, Vol.72, p.23-27
Main Authors: Sutto, Thomas E., Duncan, Teresa T.
Format: Article
Language:English
Subjects:
Anion exchanging
Applied sciences
Bromides
Cationic polymerization
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Graphite
Ionic conductivity
Ionic liquid
Ionic liquids
Lithium
Magnesium
Polymer
Polymerization
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Summary:A polymerized ionic liquid was prepared using 1,3-dibromopropane reacted with 2-methylimidazole, via a two-step synthetic process. Molecular weight analysis via gel permeation chromatography indicated a Mn of 32,600g/mol. An anion exchange is performed to replace the bromide anion of poly(1-propyl-2-methylimidazolium bromide) with bis(trifluoromethanesulfonyl)imide (TFSI). Chemical analysis results closely matched expected results. This polymer was then dissolved in acetonitrile with LiTFSI or Mg(ClO4)2 at a ratio of 1 metal cation (Li or Mg) to 3 imidazolium cations. Ionic conductivity measurements indicate ionic conductivity at room temperature of 0.4mS/cm for the Li/polymer mixture and 0.15mS/cm for the Mg/polymer mixture. Electrochemical measurements indicate that this polymer does allow for the reversible intercalation of the Li+ and Mg2+ cations into graphite.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2012.03.120