Abstract
PVDF/PAN/SiO2 polymer electrolyte membranes based on non-woven fabrics were prepared via introducing a chemical reaction into Loeb-Sourirajan (L-S) phase inversion process. It was found that physical properties (porosity, electrolyte uptake and ionic conductivity) and electrochemical properties were obviously improved. A favorable membrane structure with fully connective porous and uniform pore size distribution was obtained. The effects of PVDF/PAN weight ratio on the morphology, crystallinity, porosity, and electrochemical performances of membranes were studied. The optimized PVDF/PAN (70/30 w/w) (designated as Mpc30) polymer electrolyte membrane delivered excellent electrolyte uptake of 246.8 % and the highest ionic conductivity of 3.32 × 10−3 S/cm with electrochemical stability up to 5.0 V (vs. Li/Li+). In terms of cell performance, the Li/Mpc30 polymer electrolyte/LiFePO4 battery exhibited satisfactory electrochemical properties including high discharge capacity of 149 mAh/g at 0.2 C rate and good discharge performance at different current densities. The promising results reported here clearly indicated that PVDF/PAN/SiO2 polymer electrolyte membranes prepared by the combination of phase inversion and chemical reaction method were promising enough to be applied in power lithium ion batteries.
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Acknowledgments
The authors wish to thank the Beijing Municipal Natural Science Foundation (Project No. 2122009) for the financial support of this study.
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Liu, L., Wang, Z., Zhao, Z. et al. PVDF/PAN/SiO2 polymer electrolyte membrane prepared by combination of phase inversion and chemical reaction method for lithium ion batteries. J Solid State Electrochem 20, 699–712 (2016). https://doi.org/10.1007/s10008-015-3095-1
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DOI: https://doi.org/10.1007/s10008-015-3095-1