Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/21087
Título: | Structural studies of novel di-ureasil ormolytes doped with lithium hexafluoroantimonate |
Autor(es): | Rodrigues, L. C. Fernandes, M. Zea Bermudez, V. de Silva, Maria Manuela Smith, Michael John |
Palavras-chave: | Xerogel Lithium hexafluoroantimonate Structure Complex impedance |
Data: | Jul-2012 |
Editora: | Elsevier 1 |
Revista: | Solid State Ionics |
Resumo(s): | Hybrid electrolytes produced by the sol-gel process were obtained by doping a di-urea cross-linked POE/siloxane hybrid host framework (d-U(2000)) with lithium hexafluoroantimonate (LiSbF6). Flexible, transparent xerogel films with ∞ > n ≥ 2.5 (where n, composition, represents the molar ratio of oxyethylene units OCH2CH2 per Li+ ion), thermally stable to at least 200 ºC, were prepared. At 30 ºC the highest ionic conductivity of all the electrolytes prepared was 1.32x10-5 Scm-1 for n = 30. The electrochemical stability windows of these materials span at least 6.0 V. Samples with n < 200 are amorphous, homogeneous and non-porous. Crystallites of POE are formed in the most dilute electrolyte (n = 200). The guest Li+ ions were shown to coordinate to the oxygen atoms of the urea carbonyl groups over the entire range of salt concentration. The great majority of the SbF6- ions interact with the Li+ ions. Contact ion pairs were detected only at n = 200. Trace amounts of “free” anions exist in all electrolyte samples. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/21087 |
DOI: | 10.1016/j.ssi.2012.07.012 |
ISSN: | 0167-2738 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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SSI.MJS.ok.doc | documento principal | 1,4 MB | Microsoft Word | Ver/Abrir |