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Study of the role of ceramic filler in composite gel electrolytes based on microporous polymer membranes
Authors:Monika Osińska  Mariusz Walkowiak  Aldona Zalewska  Teofil Jesionowski
Affiliation:1. Institute of Non-Ferrous Metals Branch in Poznań, Central Laboratory of Batteries and Cells, Forteczna 12, 61-362 Poznań, Poland;2. Warsaw University of Technology, Department of Chemistry, Noakowskiego 3, 00-664 Warszawa, Poland;3. Poznan University of Technology, Institute of Chemical Technology and Engineering, Pl. Marii Sk?odowskiej-Curie 2, 60-965 Poznań, Poland
Abstract:The presented contribution aims at reconsidering the role of filler in affecting the ionic transport in composite gel electrolytes for Li-ion cells based on microporous polymer membranes. The gels have been prepared by swelling thin PVdF/HFP membranes either with conventional liquid electrolyte or with pure propylene carbonate solvent. The membranes contained dispersed submicron-size modified silica filler added in a wide range of weight ratios. The effect of filler content on the kinetics of liquid phase absorption and evaporation from the composite membranes, as well as on the conductivity of the corresponding gel electrolytes, has been studied and discussed in terms of the “colloidal” and “soggy sand” electrolyte concepts. It has been found that conductivity increase of composite gels is not directly correlated with the liquid electrolyte uptake. On this basis it is concluded that important part of ionic transport in this type of composite gel polymer electrolytes is realized on the filler grain boundaries, through overlapping space charge layers of the silica grains.
Keywords:Li-ion batteries   Composite polymer gel electrolytes   PVdF/HFP   Silica filler
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