Abstract
Porous solid polymer electrolytes (SPE) were prepared in the form of thin films by phase inversion by direct immersion in non-solvent acetone or methanol, using a copolymer of polyacrylonitrile and poly (vinyl acetate) in ethylene carbonate/dimethylene carbonate (EC/DMC 1:1 v/v) as plasticizer, which contained different LiClO4 percentages. SEM images revealed pores on a micrometer scale (average diameter around 2 μm) distributed inside and on the surface of the films. XRD patterns revealed a predominantly amorphous behavior, favorable to the ionic conduction process. Thin films presented low glass transition temperatures (T g), between −67 and −58 °C. Thin films showed a thermal stability higher than those obtained for the gels. Thin films (average thickness of 22 μm) showed ionic conductivity around 10−10 S cm−1 and 10−7 S cm−1 by immersion in acetone and methanol, respectively. The porous thin films when were swollen in liquid electrolyte, the maximum ionic conductivity value reached was of 2.5 × 10−4 S cm−1 with 10 % LiClO4 at 25 °C. The oxidation of the SPE only occurred around 4.5 V for the gel and 4.8 V versus Li/Li+ for the SPE thin film, thus resulting in a wide electrochemical stability. A stable passive layer at the interface between the polymer electrolyte and lithium metal was formed within the first 10 h and maintained during 4 weeks. The cell containing LiCoO2 in thin-film electrolyte presented the one well-known plateaux for the Li-ion intercalation in the 4 V region.
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Acknowledgments
We acknowledge the Radici Crylor of Brazil for providing the PAN/PVA copolymer and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) for technical support. This work was supported by FAPEMIG (grants APQ 2279/2010). L. C. T. Morais and R. G. Rocha are grateful to FAPEMIG for their scholarships (FAPEMIG 2013- EXA041).
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Amaral, F.A., Sousa, R.M., Morais, L.C.T. et al. Preparation and characterization of the porous solid polymer electrolyte of PAN/PVA by phase inversion. J Appl Electrochem 45, 809–820 (2015). https://doi.org/10.1007/s10800-015-0816-1
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DOI: https://doi.org/10.1007/s10800-015-0816-1