期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 75, 期 6, 页码 765-774出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2014.02.008
关键词
Polymers; X-ray diffraction; Dielectric properties; Electrical properties
资金
- Department of Science and Technology (DST), New Delhi through DTS-FITS Program [SR/S2/CMP-09/2002, SR/S2/CMP-0072/2010, SR/ FTP/PS-013/2012]
Solid polymer nanocomposite electrolytes (SPNEs) consisted of poly(methyl methacrylate) (PMMA) and lithium perchlorate (LiClO4) of molar ratio C=0:Li+ =4:1 with varying concentration of montmorillonite (MMT) clay as nanofiller have been prepared by classical solution casting and high intensity ultrasonic assisted solution casting methods. The dielectric/electrical dispersion behaviour of these electrolytes was studied by dielectric relaxation spectroscopy at ambient temperature. The dielectric loss tangent and electric modulus spectra have been analyzed for relaxation processes corresponding to the side groups rotation and the segmental motion of PMMA chain, which confirm their fluctuating behaviour with the sample preparation methods and also with change of MMT concentration. The feasibility of these relaxation fluctuations has been explained using a transient complex structural model based on Lewis acid-base interactions. The low permittivity and moderate dc ionic conductivity at ambient temperature suggest the suitability of these electrolytes in fabrication of ion conducting electrochromic devices and lithium ion batteries. The amorphous behaviour and the exfoliated/intercalated MMT structures of these nanocomposite electrolytes were confirmed by X-ray diffraction measurements. (C) 2014 Elsevier Ltd. All rights reserved.
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