The study on the conductivity and morphology of polyurethaneurea electrolytes based on poly(ethylene glycol) 2000 and LiClO4

Shao Ming Lee, Chuh Yung Chen, Cheng Chien Wang

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7 Citations (Scopus)

Abstract

Polyurethaneureas (PUU), which were synthesized from 4,4′-diphenylmethane diisocyanate (MDI), poly(ethylene glycol) (PEG, MW = 2000), and 3,5-diaminobenzoic acid, were used as the matrix of the polyelectrolytes in this study. Differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FT-IR), and 7Li magic angle spinning (MAS) solid-state NMR were used to monitor changes in the morphology of PUU electrolytes corresponding to the concentration of lithium perchlorate (LiClO4) dopants. The results of DSC and FT-IR indicate the different polymer complexes formed by the interaction of the Li+ ions with the different coordination sites of PUU. The 7Li MAS solid-state NMR investigation of the PUU electrolytes points out that two different Li+ environments exist at lower temperature. The results of DSC and the 7Li MAS solid-state NMR show that Li+ ions are preferentially coordinated to the ether oxygen of the PEG soft-segment when the salt concentration is below 0.1 mmol LiClO4(gPUU)-1. Impedance spectroscopy measurements show that the conductivity behavior followed the Arrhenius equation and was influenced by the hard-segment T g. One of the PUU electrolytes under the investigation has an ionic conductivity as high as 3.0 × 10-5 S cm-1 at 30 °C.

Original languageEnglish
Pages (from-to)3699-3708
Number of pages10
JournalElectrochimica Acta
Volume48
Issue number24
DOIs
Publication statusPublished - 2003 Oct 30

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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