Evaluation of elaboration parameters of a solid biopolymer electrolyte of cassava starch on their performance in an electrochemical accumulator

In this work, the evaluation of the performance of a solid biopolymer electrolyte elaborated from cassava starch according to its composition, humidity and thickness in an electrochemical accumulator made with polypyrrole electrodes is presented. An experiment design was carried out with the composition, humidity and thickness of the films. The response was evaluated in terms of specific capacity and specific energy of the accumulators. In addition, the electrochemical behavior was evaluated by impedance spectroscopy. The results showed that the studied factors did not modify the electrochemistry response model of the films, therefore these factors did not influence the conduction mechanisms of the solid electrolyte. However, the values of capacitance and resistance obtained from the equivalent models in the different films showed marked differences in their values. On the other hand, it was observed that one of the most influential factors in the performance of the accumulators was the composition of the films and the one that had the least influence was the humidity of the same. It was possible to conclude that although the elaboration parameters of the solid electrolyte did not have an effect on the conduction mechanisms, they did affect their electrochemical performance in a charge accumulator.

Keywords: solid biopolymer electrolyte, cassava, polypyrrole, electrochemistry accumulator.