Encontrados 19 documentos, a visualizar página 1 de 2
Characterization of polyether-poly(methyl methacrylate)-lithium perchlorate ble...
Barbosa, P. C.; Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael John; Valente, Prudência B.; Gonçalves, A.; Fortunato, E.Em publicação ; Solid polymer electrolytes (SPEs) systems based on interpenetrating blends of poly(ethylene oxide-co-propylene oxide) and poly(methyl methacrylate) host matrices, with lithium perchlorate as guest salt, were prepared. These electrolytes were presented as free-standing films, and their thermal and electrochemical properties were characterized by conductivity and electrochemical stability measure...
Characterization of pTMCnLiPF6 solid polymer electrolytes
Barbosa, P. C.; Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael JohnIn this study the results our characterization of a solid polymer electrolyte based on poly(trimethylene carbonate), henceforth designated as p(TMC), and lithium hexafluorophosphate (LiPF6) are described. Samples of solvent-free electrolytes were prepared with a range of concentration of guest salt using solvent casting from tetrahydrofuran and characterized by conductivity measurements, thermal analysis and el...
Di-ureasil hybrids doped with LiBF4 : attractive candidates as electrolytes for...
Barbosa, P. C.; Fernandes, M.; Silva, Maria Manuela; Smith, Michael John; Vilela, Sérgio M. F.; Gonçalves, A.; Olveira, M. C.; Fortunato, E.; Rego, R.The sol-gel process has been used to prepare hybrid electrolytes composed of a poly(oxyethylene) (POE)/siloxane hybrid network doped with lithium tetrafluoroborate (LiBF4) with compositions of n between ∞ and 2.5. In this context the lithium salt concentration is expressed in terms of the number of oxyethylene units in the organic component of the network per Li+ ion. Electrolyte samples with n ≥ 20 are thermal...
Di-ureasil hybrids doped with LiBF4 : spectroscopic study of the ionic interact...
Fernandes, Mariana; Barbosa, P. C.; Silva, Maria Manuela; Smith, Michael John; Zea Bermudez, V. deIn the present work Fourier Transform infrared and Raman spectroscopy were used to characterize the cation/polymer, cation/cross-link, cation/anion and hydrogen bonding interactions in hybrid electrolytes composed of lithium tetrafluoroborate (LiBF4) and di-urea cross-linked poly(oxyethylene) (POE)/siloxane hybrid networks (di-ureasils) designated as d-(2000) and d-U(600) and incorporating polyether chains with...
Solid-state electrochromic devices using pTMC/PEO blends as polymer electrolytes
Barbosa, P. C.; Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael John; Parola, A. J.; Pina, F.; Pinheiro, CarlosFlexible, transparent and self-supporting electrolyte films based on poly(trimethylene carbonate)/poly(ethylene oxide) ((p(TMC)/PEO) interpenetrating networks doped with LiClO4 were prepared by the solvent casting technique. These novel solid polymer electrolyte (SPE) systems were characterized by measurements of conductivity, cyclic voltammetry, differential scanning calorimetry and thermogravimetry. The incor...
Mg2+-doped poly(ε-caprolactone)/siloxane biohybrids
Teixeira, J. C. S.; Fernandes, M.; Zea Bermudez, V. de; Barbosa, P. C.; Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael JohnElectrolytes based on a poly(ε-caprolactone) (PCL)/siloxane organic/inorganic host framework doped with magnesium triflate (Mg(CF3SO3)2) were synthesized by the sol-gel process. In the biohybrid matrix short PCL chains are covalently bonded via urethane linkages to the siliceous network. In this study the salt content of samples was identified using the conventional n notation, where n indicates the number of (...
Synthesis and thermal behaviour of an amorphous solid polymer electrolyte
Barbosa, P. C.; Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael John; Costa, Marta Sílvia Freitas daIn this study the synthesis of an amorphous polymer network, poly[oxymethylene-oligo(oxyethylene)], designated as aPEO, is described. This polymer has been characterized by gel permeation chromatography, thermal analysis, conductivity measurements, evaluation of electrochemical stability and nuclear magnetic resonance spectroscopy. The synthetic procedure developed permits partial fractionation of the product o...
Application of hybrid materials in solid-state electrochemical devices
Rodrigues, L. C.; Barbosa, P. C.; Silva, Maria Manuela; Smith, Michael John; Gonçalves, A.; Fortunato, E.Sol-gel derived cross-linked PEO/siloxane xerogels (designated as di-ureasils) were prepared using lithium trifluoromethanesulfonyl imide (LiTFSI) as a guest salt. In this paper we describe the assembly of a prototype solid-state electrochromic device (ECD) based on a four-layer sandwich structure, with the following configuration: glass/IZO/WO3/polymer electrolyte/IZO/glass. The electrochromic switching perfor...
Di-ureasil xerogels containing lithium triflate for application in solid state ...
Barbosa, P. C.; Silva, Maria Manuela; Smith, Michael John; Gonçalves, A.; Fortunato, E.; Zea Bermudez, V. de; Nunes, SílviaDocumento submetido para revisão pelos pares. A publicar em Electrochimica Acta. ISSN 0013-4686. ; In this study we report the characterization of a solid-state electrochromic device based on poly(ethylene oxide) (PEO)/siloxane hybrid networks doped with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The polymer networks prepared, classed as di-ureasils and represented by d-U(2000), were produced by the ...
Characterization of lithium-based solid polymer electrolytes
Barbosa, P. C.; Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael JohnSol-gel derived poly(oxyethylene)/siloxane hybrids doped with lithium hexafluoroantimonate, LiSbF6, have been prepared. Compositions of these novel xerogel electrolytes were identified using the conventional d-U(2000)nLiSbF6 notation, (where n is the molar ratio of oxyethylene moieties per Li+ ion) and samples with n between ∞ and 2.5 were characterized by conductivity measurements, cyclic voltammetry at a gold...
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