Composite polyether electrolytes with Lewis acid type additives
Władysław Wieczorek , Aldona Zalewska , D. Raducha , Zbigniew Florjańczyk , J. R. Stevens
AbstractThe effects of AlBr3, AlCl3, and α-Al2O3 on the conductivity and ultrastructure of electrolytes based on LiClO4 and polyethers have been studied. The results obtained are analyzed in terms of Lewis acid?base interactions occurring between various chemical moieties within these composite systems. It is shown that aluminum halides form complexes with ClO4- anion acting as plasticizing agents for polyether matrixes. However, aluminum halides interact also with polyethers leading to the formation of polyether?aluminum halide complexes, thus stiffening polymeric electrolytes. It is shown that for low additive concentrations the addition of Lewis acid results in a decrease in the degree of crystallinity of poly(ethylene oxide)-based electrolytes; this is followed by an increase in the conductivity. A significant increase in conductivity was obtained at 0 and 25 °C for samples containing up to 25 mass \% of aluminum halides or α-Al2O3. For samples containing more than 30 mass \% of the additive, the effect of the stiffening of polymer hosts dominates (and is confirmed by the increase in Tg values observed from DSC experiments) and the conductivity decreases.
|Journal series||Journal of Physical Chemistry B, ISSN 1520-6106|
|Publication indicators||: 2006 = 4.115 (2) - 2007=4.475 (5)|
|Citation count*||84 (2015-05-09)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.