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Sol-gel preparation of a di-ureasil electrolyte doped with lithium perchlorate

M. M. Silva ; S. C. Nunes ; P. C. Barbosa ; A. Evans ; V. De Zea Bermudez ; M. J. Smith ; Denis Ostrovskii (Institutionen för teknisk fysik)
Electrochimica Acta (00134686 ). Vol. 52 (2006), 4, p. 1542-1548.
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2009-12-07.
CPL Pubid: 102927


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Institutionen för teknisk fysik (1900-2015)


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