Composite Polymer Positive Electrodes in Solid‐State Lithium Secondary Batteries

Publisher Website
Google Scholar
Abstract
We have developed composite polymer electrodes for use in all solid‐state batteries in combination with Li. The composite is formed from water soluble polypyrrole which is combined with the solid polymer electrolyte polyethylene oxide. The composite electrode shows enhanced coulombic capacity as compared to an electrode composed only of the electroactive material, polypyrrole. Coulombic efficiency is good (90–95%) and energy efficiency is acceptable (80–85%) in galvanostatic studies. Charge retention is rather poor due to self‐discharge. We have obtained proof that the electroactivity is due to polypyrrole, through the use of in situ spectroelectrochemical studies. We have characterized the composite electrode using scanning electron microscopy and conductivity measurements, and conclude that the composite material consists of very small globules of electroactive material in a matrix of polyethylene oxide. Based on these results we argue that solid solutions of electroactive polymers in polymeric electrolytes offer interesting alternatives for solid‐state batteries.

This publication has 0 references indexed in Scilit: