Polyaniline, a conjugated polymer, has attracted great attention for electrode materials in the field of energy storage due to its good capacity, conductivity, and ease of synthesis. However, it is challenging to disperse the conductive form of polyaniline in many solvents. As an electrode in a non-aqueous energy storage system, polyaniline gradually loses its electrochemical activity due to its irreversible oxidation to pernigraniline base. Here, we present polyaniline: poly(2-acrylamido-2-methylpropane sulfonic acid) (PANI:PAAMPSA) colloids as a water-processable material for electrodes in non-aqueous energy storage systems. We demonstrate that PANI:PAAMPSA stores 230 mAh/g of polyaniline for over 800 cycles, while homopolymer polyaniline loses nearly all of its capacity after 100 cycles. PANI:PAAMPSA is stable up to 4.5 V vs Li/Li+, the formation of pernigraniline base is prevented, and the resulting energy storage performance far exceeds that of polyaniline homopolymer. Instead PANI:PAAMPSA reversibly switches among leucoemeraldine base, emeraldine salt, and pernigraniline salt forms.

Oxidatively stable and water-processable polyaniline: Poly(2-acrylamido-2-methylpropane sulfonic acid) complexes for electrochemical energy storage

245th National Meeting (2013)

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