ABSTRACT
Abstract ................................................................................................... 78 7.1 Introduction .................................................................................... 78 7.2 Experimental Part ........................................................................... 80 7.3 Results and Discussion .................................................................. 81 7.4 Conclusions .................................................................................... 93 Acknowledgements ................................................................................. 93 Keywords ................................................................................................ 94 References ............................................................................................... 94
ABSTRACT
The electrical conductivity of solid polymer electrolyte membranes based on three type of polysiloxanes containing propyl butyrate, acetyl acetonate and allyl cyanide as pendant groups and lithium trifluoromethylsulfonate (triflate) or lithium bis(trifluoromethylsulfonyl)-imide were investigated by impedance spectroscopy. It is experimentally shown that the dependence of conductivity of polyelectrolytes has extreme character – corresponding curves are characterized with maximums, the intensity and location of which are determined by types of polymer matrix and Li-salt. This result is explained in terms of formation of ion-pairs at relatively high concentrations of anions, the mobility of which is lower in comparison with monoions. Temperature dependence of the electrolytes conductivity describes by Vogel-Tamman-Fulcher (VTF) or Arrhenius formula. These dependences are defined mainly with the value of ion mobility in the polymer matrix. The electrical conductivity of these materials at room temperature belongs to the range of 7×10-9 to 4×10-4 S/cm. The voltamogrames of investigated polyelectrolytes for small values of voltages have been obtained.
