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

研究成果: Article同行評審

8 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)3699-3708
頁數10
期刊Electrochimica Acta
48
發行號24
DOIs
出版狀態Published - 2003 10月 30

All Science Journal Classification (ASJC) codes

  • 化學工程 (全部)
  • 電化學

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