Mixed solid device based on conducting polymer composite and polymer electrolyte

Tetraethyl orthosilicate (TEOS) derived sol-gel porous films have been utilized as template for the electrochemical polymerization of aniline. Polyaniline-silica composites were obtained and the redox behavior and charge/discharge capacities of a lithium polymeric battery using poly (dimethylsiloxane-co-ethylene oxide) as gel polymeric electrolyte, were investigated. The composite presented a high initial capacity (140 mA h g(-1)) and a reversible capacity of 75 mA h g(-1) after 100 charge/discharge cycles. The decrease in the specific capacity was attributed to an increase in charge transfer resistance and a decrease in the diffusion coefficient measured by electrochemical impedance spectroscopy.