Li+ ION TRANSPORT IN GEL ELECTROLYTES OF PU-EC-PC SYSTEM
Partially cross inked polyurethane gels were synthesized with PEO triol and 4,4’-methylenediphenyl diisocyanate as the reactants, propylene carbonateethylene carbonate as mixed solvents and LiClO4 as salt.. Transport properties of these gel electrolytes were studied by impedance spectroscopy over a wide range of frequency and temperature. The gel-electrolyte with optimized composition showed highest ionic conductivity of the order 10-3(S/cm) at room temperature. The environment of the lithium ion and its mobility in the PU gels were studied by NMR spectroscopy. NMR spectra of the gels indicated the presence of lithium ions in three different environments: The varying widths of all these lines as a function of temperature was attributed to the decreasing mobility of Li+ ions as a consequence of increasing viscosity of the solvent. The most shielded Li resonance peak was further characterised by pulsed-gradient spin-echo (PGSE)-NMR in order to get the diffusion coefficient. Li+ ion conductivity of the gels were calculated from diffusion coefficient using Nernst Einstein equation.
R. BALAI R. S. SRINIVASA A. R. KULKARNI JUNICHI KAWAMURA
Indian Institute of Technology-Bombay Powai Mumbai 400076, India Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai, 9
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
324-335
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）