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Polyaniline Secondary Cells With Ambient Temperature Molten Salt Electrolytes

N. Koura, H. Ejiri, K. Takeishi
Published 1993 · Chemistry

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An Al/polyaniline (PAn) powder secondary cell with an AlCl[sub 3]-1-butylpyridinium chloride (BPC) or an AlCl[sub 3]-1-ethyl-3-methylimidazolium chloride (EMIC) electrolyte has been investigated. The configuration of the Al/PAn secondary cell with an acidic AlCl[sub 3]-EMIC electrolyte was: open-circuit voltage (OCV) = 1.7 V, discharge capacity = 42 Ah, charge/discharge efficiency = 90%. 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 AlCl[sub 3], the redox potential of PAn was less noble and the reaction current was large. A PAn/PAn secondary cell with the acidic AlCl[sub 3]-EMIC 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.



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