Sol-gel preparation of a di-ureasil electrolyte doped with lithium perchlorate |
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Authors: | M.M. Silva S.C. Nunes A. Evans M.J. Smith |
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Affiliation: | a Departamento de Química, Universidade do Minho, Gualtar, 4710-057 Braga, Portugal b Departamento de Química and CQ-VR, Universidade de Trás-os-Montes e Alto Douro, 5000-911 Vila Real, Portugal c Department of Applied Physics, Chalmers University of Technology, 41296 Goteborg, Sweden |
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Abstract: | Solid polymer electrolytes (SPEs) synthesized by the sol-gel process and designated as di-ureasils have been prepared through the incorporation of lithium perchlorate, LiClO4, into the d-U(2000) organic-inorganic hybrid network. Electrolytes with lithium salt compositions of n (where n indicates the number of oxyethylene units per Li+ ion) between ∞ and 0.5 were characterized by conductivity measurements, cyclic voltammetry at a gold microelectrode, thermal analysis and Fourier transform Raman (FT-Raman) spectroscopy. The conductivity results obtained suggest that this system offers a quite significant improvement over previously characterized analogues doped with lithium triflate [S.C. Nunes, V. de Zea Bermudez, D. Ostrovskii, M.M. Silva, S. Barros, M.J. Smith, R.A. Sá Ferreira, L.D. Carlos, J. Rocha, E. Morales, J. Electrochem. Soc. 152 (2) (2005), A429]. “Free” perchlorate ions, detected in all the samples examined, are identified as the main charge carriers in the sample that yields the highest room temperature conductivity (n = 20). In the di-ureasils with n ≤ 10 ionic association is favoured and the ionic conductivity drops. |
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Keywords: | Solid polymer electrolytes Lithium perchlorate Sol-gel process Organic-inorganic hybrid networks |
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