Polypyrrole as an electrode material for secondary lithium cells

Polypyrrole is a promising positive electrode material for the application in secondary lithium cells. The elemental analysis performed on electrochemically prepared polypyrrole films indicates a specific capacity of 82 Ah/kg. This specific capacity can be cycled in half cell experiments for many hundred times. The rate of self discharge of such an electrode is about 1%/day. On the basis of these results it will be shown that a lithium polypyrrole cell of optimal design may arrive at an energy density of about 40 ‐ 60 Wh/kg. First results obtained with practical cells of technical design confirm this statement.