NMR and conductivity study of PEO-based composite polymer electrolytes

• Published in: Electrochimica acta Vol. 48; no. 14; pp. 2239 - 2246
• Main Authors: Bloise, A.C, Donoso, J.P, Magon, C.J, Rosario, A.V, Pereira, E.C
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 30.06.2003; Elsevier
• Subjects: Applied sciences; Chemistry; Composite; Composites; Electrochemistry; Exact sciences and technology; Forms of application and semi-finished materials; General and physical chemistry; Ionic conductivity; NMR; PEO; Polymer electrolyte; Polymer industry, paints, wood; Properties of electrolytes: conductivity; Technology of polymers; TiO 2; Polymer electrolyte; NMR; PEO; Composite; TiO 2; Ionic conductivity; Titanium IV Oxides; Electrical properties; Nanoparticle; Spin lattice relaxation; Lithium Perchlorates; Temperature effect; Polymer solid electrolyte; NMR spectrometry; X ray diffraction; Composite material; Ethylene oxide polymer; Lithium 7; Surface properties; Surface area; TiO2
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/S0013-4686(03)00210-X

The influence of the space charge created by the presence of TiO 2 nanoparticles on the lithium and polymer chain mobility have been investigated in solid composite polymer electrolytes (CPE), poly(ethylene oxide) (PEO) LiClO 4, by using complex impedance spectroscopy and nuclear magnetic resonance (NMR). Special care was taken with the synthesis and the characterization of the TiO 2 particles and with the composite preparation. The conductivity and NMR measurements were undertaken in composite samples nanoparticles having constant total surface area. Proton ( 1H) and lithium ( 7Li) lineshapes and spin-lattice relaxation times were measured as a function of temperature. Activation energies extracted from the 7Li relaxation data are in the range 0.20–0.22 eV. The NMR decoupling experiment suggests that the Li–Li interactions are stronger in the composites when compared with those of the ceramic free electrolytes.