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1 Materials Science Poland

1 2006

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

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

Materials Science Poland

2006

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.