Polymer electrolytes based on polyvinyilidene fluoride are widely studied for their applications in lithium batteries and proton fuel cells. Semicrystalline, porous membranes are conveniently obtained by phase inversion methods. In this paper, we report on the preparation of membranes with porosity ranging from ∼7% to ∼85% and morphology which depends on the preparation conditions. The contributions to the overall electrolyte uptake given by pores filling up and swelling of the polymer amorphous phase are separated. The ionic conductivity of the membranes is discussed in terms of tortuosity and percolation through a continuous medium, that can be approximated by a fractal Bethe lattice.
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Quartarone et al. (2002) studied this question.
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