Project/scholarship details

  • Funder

    FCT - Fundação para a Ciência e a Tecnologia, I.P.

  • Funder's country

    Portugal

  • Funding program

    POCI

  • Funding amount

    52,000.00 €

  • Start date

    2005-07-01

  • End date

    2008-08-30

Documents

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

Silva, Maria Manuela; Nunes, Sílvia; Barbosa, P. C.; Evans, A.; Zea Bermudez, V. de; Smith, Michael John; Ostrovskii, David

Solid polymer electrolytes (SPEs) synthesized by the sol-gel process and designated as ormolytes (organically modified electrolytes), have been prepared through the incorporation of lithium perchlorate, LiClO4 into the 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 ...

Date: 2006   |   Origin: RepositóriUM - Universidade do Minho
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Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate

Nunes, Sílvia; Zea Bermudez, V. de; Ostrovskii, David; Tavares, P. B.; Barbosa, P. C.; Silva, Maria Manuela; Smith, Michael John

Di-urea cross-linked POE/siloxane hybrid ormolytes (di-ureasils) doped with a wide concentration range of lithium perchlorate trihydrate (LiClO4·3H2O) (200 ≥ n ≥ 0.5, where n expresses the salt content in terms of the number of ether oxygen atoms per Li+ ion) have been analysed by Fourier transform infrared and Raman (FT-IR and FT-Raman, respectively) spectroscopies and X-ray diffraction (XRD). The results obta...

Date: 2007   |   Origin: RepositóriUM - Universidade do Minho
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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 da

In 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...

Date: 2010   |   Origin: RepositóriUM - Universidade do Minho
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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. de

In 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...

Date: 2011   |   Origin: RepositóriUM - Universidade do Minho
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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 measureme...

Date: 2011   |   Origin: RepositóriUM - Universidade do Minho
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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...

Date: 2011   |   Origin: RepositóriUM - Universidade do Minho
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Characterization of pTMCnLiPF6 solid polymer electrolytes

Barbosa, P. C.; Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael John

In 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...

Date: 2011   |   Origin: RepositóriUM - Universidade do Minho
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