Practical limitations of polyacetylene used as a high-power-density cathode

Abstract

Secondary cells of the type [CH(ClO₄)_0.06]_x|propylene carbonate, LiClO₄|Li containing polyacetylene, (CH)_x, in a film and foam morphology have been compared for maximum power density. High power densities obtained are a result of the thin-film nature of the polymer. When the same weight-to-projected area ratio of (CH)_x is used, power densities are the same and are limited by electrolyte resistance rather than interfacial charge-transport resistance. A theoretical relationship is derived showing an inverse proportionality of maximum power density to film thickness. The contributions of film resistance to cell internal resistance are analysed and used to explain relative depths of discharge and limiting power densities for polyacetylene with point and surface contact.