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2 Materials Science Poland

2 2006

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

100%

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

Materials Science Poland

2006

tom 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.

Application of silicon and titanium alkoxylates as bifunctional additives for composite polymeric electrolytes

86%

Sitarek A. , Rajewski P. , Żukowska G. , Wyciślik H. , Ciosek M. , Siekierski M.

Materials Science Poland

2006

tom Vol. 24, No. 1

213--219

Addition of ceramic grains is widely recognized as an important method for polymer matrix modification. As grain size plays an important role (smaller grains interact stronger), a serious problem appears for nano-sized grains due to their easy agglomeration and difficulties with homogenisation. On the other hand, residual water must be carefully removed from the electrolyte. In this work, we propose a method of simultaneous in-site filler generation and water trapping in the hydrolysis of silicon and titanium alkoxylates. Ti(OEt)4 and Si(OEt)4 used are both commercially available. Conductivity studies were correlated with FT-IR investigations to compare the effect of classical (thermo-vacuum) and chemical drying. Lithium perchlorate and lithium trifluoromethanosulfonate were used as doping salts. Low molecular weight polyglycol in the form of mono- and dimethyl ether was used as the polymer matrix. We observed the influence of drying on ion association in the electrolyte, together with respective conductivity changes. The drying process decreases the conductivity of the composite, whereas filler grain formation increases it. The sign of the final conductivity change varies with the matrix and salt type.