Abstract
An all solid‐state lithium/polypyrrole (PPy) battery using polyethylene oxide 
as a solid polymer electrolyte was assembled, and the effects of the morphology of the PPy film and the concentration of 
on battery performance were investigated. Optimum conditions for the redox properties of PPy films in 
at 80°C were obtained with an 
concentration of 
when using rough PPy film. A Li/PPy battery using
with optimized conditions exhibited high coulombic efficiency, above 90% at 0.1 mA cm−2 at 80°C. Cyclability of 1400 cycles with high coulombic efficiency was attained.