Abstract
This study investigates Li+ ion-conducting biopolymer blend electrolytes-based on chitosan (CS) and potato starch (PS) with glycerol plasticization. The advanced techniques including FTIR, impedance, TNM, LSV, and CV were employed to characterize the compositional and electrochemical properties of the solid films. The FTIR analysis indicates significant influence of glycerol on polymer/salt interactions, evidenced by the shift of FTIR bands to lower wavenumbers, signifying an increase in free ions within the host polymer system. Impedance results indicate that plasticizer addition reduces the bulk resistance to an optimum value of 49 Ω. The calculated DC values demonstrate the suitability of the electrolyte for use in energy storage applications (ESAs) with the highest ionic conductivity of 2.01 × 10−4 S cm−1. The high values of both \({\epsilon }^{{\prime }}\) and \({\epsilon }^{{\prime }{\prime }}\) at lower frequencies are due to interfacial polarization and the accumulation of charges, respectively. The sample with the largest plasticizer content has shown the highest \({\epsilon }^{{\prime }}\) of 112.4 at 105 Hz. The shifting of tan δ peaks to the higher frequency side with the increase of plasticizer indicates an increase in the mobility of cations. The combination of tan δ plot and Argand plot was used to explore the dominant mechanism in ion conduction. The electrochemical studies were performed to detect the ability of the films to be used for EDLC applications. The TNM (tion=0.947) and LSV (decomposition voltage = 3.1 V) values favor the films for ESAs. The pattern of CV curves at various scan rates established the successful design of the EDLC device. The calculated capacitance from the area under CV curves is sufficiently high. The capacitance was influenced by scan rates and changed from 12.92 to 38.68 F/g.
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Acknowledgements
The authors gratefully acknowledge all the support for this study from the Ministry of Higher Education and Scientific Research-Kurdish National Research Council (KNRC), Kurdistan Regional Government. The support from the University of Sulaimani, University of Humburg, University of Charmo, University of Cihan Sulaimaniya, University of Raparin and University of Malaya are greatly acknowledged. The authors express their gratitude to the Researchers Supporting Project Number (RSP2024R348), King Saud University, Riyadh, Saudi Arabia.
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Aziz, D.M., Abdulwahid, R.T., Hassan, S.A. et al. Development and Investigation of Electrochemical and Dielectric Properties of Eco-Friendly Lithium-Ion Conductor Biopolymer Electrolyte for Energy Storage Application. J Polym Environ (2024). https://doi.org/10.1007/s10924-024-03198-5
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DOI: https://doi.org/10.1007/s10924-024-03198-5