Morphological and conductivity studies of di-ureasil xerogels containing lithium triflate
2002; Elsevier BV; Volume: 47; Issue: 15 Linguagem: Inglês
10.1016/s0013-4686(02)00100-7
ISSN1873-3859
AutoresS.M. Gomes Correia, V. de Zea Bermudez, M.M. Silva, Sandra Cerqueira Barros, Rute A. S. Ferreira, Luís D. Carlos, A.P Passos de Almeida, Michael J. Smith,
Tópico(s)Advanced Battery Materials and Technologies
ResumoSol–gel derived poly(oxyethylene)/siloxane hybrids doped with lithium triflate, LiCF3SO3, have been investigated. The host hybrid matrix of these materials, named di-ureasil and represented by U(600), is composed by a siliceous framework to which polyether chains containing 8.5 oxyethylene repeat units are covalently bonded through urea linkages. Xerogel samples U(600)nLiCF3SO3 with n (where n is the molar ratio of oxyethylene moieties per Li+ ion) between ∞ and 0.1 have been examined. X-ray diffraction and differential scanning calorimetry have provided conclusive evidence that the xerogels analyzed are entirely amorphous. The salt-rich material with n=1 exhibits the highest conductivity over the whole range of temperature analyzed (e.g. 4.3×10−6 and 2.0×10−4 Ω−1 cm−1, respectively, at 25 and 94 °C).
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