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PEO/P(VdF-HFP) blend based Li+ ion-conducting composite polymer electrolytes dispersed with dedoped (insulating) polyaniline nanofibers

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Abstract

Composite polymer electrolyte membranes composed of poly(ethylene oxide) (PEO), poly(vinylidene fluoride-hexafluoropropylene) {P(VdF-HFP)} blends, dedoped (insulating) polyaniline (PAni) nanofibers, and LiClO4 as salt have been synthesized with varying fraction of dedoped PAni nanofibers (from 2 to 10 wt.%). The ionic conductivity of PEO–P(VdF-HFP)–LiClO4 electrolyte system increases with increase in the fraction of dedoped polyaniline nanofibers. This could be attributed to the incorporation of nanofibers (aspect ratio >50), which may provide high ion conducting path along the interface due to Lewis acid–base interactions between Li+ ions and lone pair of electrons of nitrogen atom of polyaniline. However, at higher fraction (>6 wt.%), the nanofibers get phase separated from the polymer matrix and form domain-like structures, which may act as physical barrier to the conduction of Li+ ions resulting in decreased ionic conductivity. Electrochemical potential window and interfacial stability of nanofibers dispersed polymer electrolyte membranes are also better than that of nanofibers free membranes.

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Acknowledgment

The authors would like to thank Mr. A.K. Nath and Mr. Somik Banerjee, Department of Physics, Tezpur University, for their help in synthesis and making measurements during the course of this work.

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  1. Materials Research Laboratory, Department of Physics, Tezpur University, Napaam, Tezpur, Assam, 784028, India

    Ashok Kumar & Madhuryya Deka

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  1. Ashok Kumar
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  2. Madhuryya Deka
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Correspondence to Ashok Kumar.

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Kumar, A., Deka, M. PEO/P(VdF-HFP) blend based Li+ ion-conducting composite polymer electrolytes dispersed with dedoped (insulating) polyaniline nanofibers. J Solid State Electrochem 16, 35–44 (2012). https://doi.org/10.1007/s10008-010-1271-x

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