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Ionic conduction and charge carrier relaxation in chitosan acetate based solid biopolymer electrolyte embedded with LiClO4

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Abstract

The ionic conduction, charge carrier relaxation and transport properties of a cost-effective and environment friendly chitosan acetate (CA) – lithium perchlorate (LiClO4) solid biopolymer electrolytes (SBE) are reported here. The highest ionic conductivity of 1.33 \(\times\) 10–5 S/cm is obtained for the SBE at 44.44 wt. % LiClO4 concentration at room temperature. Mobility of the free carrier ions is significantly increased by two orders of magnitude with enhanced charge carrier hopping rate due to the inclusion of salt. The frequency dependence of the conductivity spectra are analyzed based on a model considering the fractal nature of the electrode-SBE interface. A remarkable improvement in dielectric constant (from ~ 102 to ~ 105) is observed with increase in salt concentrations. The electric modulus spectra are analyzed using Havriliak–Negami equation, inferring a non-Debye type relaxation process. The relaxation function of the SBE is modeled successfully using non-exponential KWW function. It is observed that the value of the stretched exponent is much less than unity, suggesting that the charge carrier relaxation behavior is highly non-exponential in the SBE. FTIR spectroscopy confirms more lithium ion coordination with the polar amide groups of biopolymer, resulting in ionic transport through the biopolymer chains.

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Acknowledgement

Simantini Majumdar is thankful to DST PURSE – II (Ref. No. P-1/RS/18/17) for the research fellowship. Ruma Ray would like to thank DHESTBT, Government of West Bengal (Project No. 426(Sanc.)/ST/P/S&T/16G-16/2018) and JU-RUSA 2.0 Major Research Support (Project No. R-11/468/19) for providing the financial support. Authors wish to thank DST, Government of India, for developing instrument facility like LCR meter (Agilent 4294A-Precision Impedance Analyzer) under FIST programme at Department of Physics, Jadavpur University.

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  1. Department of Physics, Jadavpur University, Kolkata-700032, India

    Simantini Majumdar & Ruma Ray

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  1. Simantini Majumdar
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Correspondence to Ruma Ray.

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Majumdar, S., Ray, R. Ionic conduction and charge carrier relaxation in chitosan acetate based solid biopolymer electrolyte embedded with LiClO4. J Polym Res 28, 157 (2021). https://doi.org/10.1007/s10965-021-02509-x

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