Abstract
Li ion conducting polymer electrolyte films were prepared based on poly(vinyl alcohol) (PVA) with 5, 10, 15, 20, 25 and 30 wt% lithium iron phosphate (LiFePO4) salt using a solution-casting technique. X-ray diffraction (XRD) was used to determine the complexation of the polymer with LiFePO4 salt. Differential scanning (DSC) calorimetry was used to determine the melting temperatures of the pure PVA and complexed films. The maximum ionic conductivity was found to be 1.18 × 10−5 S cm−1 for (PVA:LiFePO4) (75:25) film, which increased to 3.12 × 10−5 S cm−1 upon the addition of propylene carbonate (PC) plasticizer at ambient temperature. The Li+ ion transport number was found to be 0.40 for (PVA: LiFePO4) (75:25) film using AC impedance and DC polarization methods. Dielectric studies were performed for these polymer electrolyte films in the frequency range of 10 Hz to 10 MHz at different temperatures. The activation energies of the complexed films were calculated from the dielectric loss tangent spectra and were found to be 0.35, 0.30, 0.27 and 0.28 eV. The cyclic voltammogram (CV) curves of (PVA: LiFePO4) (75:25)+PC film exhibited higher specific capacities than those for other films.
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Acknowledgements
One of the authors (V.M. Mohan) wishes to thank Wuhan University of Technology Management for its financial support in the form of a postdoctoral fellowship, which enabled the above work to be carried out. This work is supported by the Chinese Postdoctoral Science Foundation (CPSF; No; 20080440966), the National Nature Science Foundation of China (no. 50672071), and the Program for Changjiang Scholars and Innovative Research Team in University, Ministry of Education, China (PCSIRT) (No. IRT0547).
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Mohan, V.M., Qiu, W., Shen, J. et al. Electrical properties of poly(vinyl alcohol) (PVA) based on LiFePO4 complex polymer electrolyte films. J Polym Res 17, 143–150 (2010). https://doi.org/10.1007/s10965-009-9300-0
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DOI: https://doi.org/10.1007/s10965-009-9300-0