Synthesis and electrochemical characterization of crosslinked poly(ethylene oxide) containing LiN(CF₃SO₂)₂

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• 作者：Guegan ; P. ; Cheradame ; H. ; Carvalho ; L.M. ; Gomes ; A.S.
• 刊名：European Polymer Journal
• 出版年：1997
• 期刊代码：35_00143057
• 类别：ms
• 出版时间：October, 1997
• 卷：33
• 期：1
• 页码：1741-1745
• 文件大小：411 K

摘要

The ionic conductivity of polymeric electrolyte systems comprising a network of poly(ethylene oxide) (PEO) crosslinked with urethane functions and containing LiN(CF₃SO₂)₂ (TFSILi), was studied. Polyurethanes based on three different PEO molecular weights were prepared. Diffusion studies of TFSILi in swollen PEO-urethane membranes with acetonitrile were performed showing a diffusion coefficient for PEO₂₀₀₀ higher than that observed with LiClO₄ in the same material, and were correlated with the variation of T_g's of the dried membranes which were determined as a function of salt concentration and crosslink density. The influence of a salt molecule on the T_g (for the TFSILi charged membranes) is equivalent to 25%of the influence of a covalent crosslink in the range of molecular weight between crosslinks used in this study. The relatively high slope for the plot T_g⁻¹ vs salt concentration for the network in PEO₆₀₀ allows to consider a high chain rigidification due to the introduction of salt. The conductivity of network based on PEO₂₀₀₀, with a molar concentration ratio O/Li = 43 reached 10⁻⁵ S cm⁻¹.