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1 Materials Science Poland

1 2006

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Novel composite polymer-in-salt electrolytes based on a PVdF matrix obtained with a solvent-free technique

Piekarska J., Ptasińska M., Żukowska G., Wyciślik H., Siekierski M.

Materials Science Poland

2006

Vol. 24, No. 1

205--211

Polymer-in-salt electrolytes have been widely investigated as potentially interesting materials for applications in both lithium devices and for basic studies of materials being halfway between polymeric electrolytes and conductive inorganic glasses. Novel composite "polymer-in-salt" electrolytes were synthesized based on a poly(vinylidene difluoride) matrix and various lithium salts. The polymer was chosen due to its high chemical, electrochemical, and thermal stability, widely known from the application in gel electrolytes in lithium batteries. On the other hand, it is well known that a solvent, once incorporated into a PVdF structure, is impossible to remove. Thus a novel method, based on thermal sintering of the composite, was developed to avoid contamination of the sample. Electrolytes of different polymer-to-salt molar ratios, varying from 0.5:1 to 2:1, were synthesized. The influence of preparation conditions (sintering time, temperature and the number of sintering cycles) was also examined. Impedance spectroscopy was used to measure electrical conductivity. Infrared spectroscopy was introduced to investigate ion-ion and ion-polymer interactions and the phase structure of the polymer matrix. Additionally, X-ray diffractometry was applied in structural studies.