Polyaniline Secondary Cells with Ambient Temperature Molten Salt Electrolytes

An Al/polyaniline (PAn) powder secondary cell with an or an electrolyte has been investigated. The configuration of the Al/PAn secondary cell with an acidic electrolyte was: open‐circuit voltage , , . A 24% increase in the discharge capacity over a BPC system electrolyte is obtained. The difference was attributed to the electrolyte properties, i.e. , conductivity and viscosity. In the basic EMIC system bath of 44.4 m/o , the redox potential of PAn was less noble and the reaction current was large. A PAn/PAn secondary cell with the acidic catholyte and the basic anolyte was proposed. The OCV showed 1.0 V and the PAn/PAn secondary cell was promising. A PAn prepared from a nonaqueous BPC system bath was more electrochemically active than that prepared from an aqueous bath. The optimum OCV, discharge capacity, and charge/discharge efficiency of the Al/PAn (from the BPC bath) were 1.6 V, 68 Ah/kg‐PAn, and 99%, respectively.