Preparation of FeCl3-graphite interlayer compounds and their influence on conductivity of polyvinylidene fluoride membrane
FeCl3-intercalated graphite interlayer compounds(FeCl3-GICs)with high-conductivity are conveniently prepared by using FeCl3 and flake graphite as raw materials through an improved molten salt method.These compounds are used as conductive fillers in a polyvinylidene fluoride(PVDF)matrix to fabricate FeCl3-GICs/PVDF composite conductive membrane with anisotropic conductivity.The prepared FeCl3-GICs fillers and composite conductive membrane are characterized and evaluated under various methods.Results show that the interlayer spacing of the prepared FeCl3-GICs increases to 0.94 nm from 0.335 nm of the graphite raw material,and the conductivity of FeCl3-GICs powder enhances to 9.09×104 S·m-1 from 2.86×104 S·m-1 of the graphite,improving the conductivity by more than threefold.The composite conductive membrane prepared with FeCl3-GICs as the conductive fillers can increase the in-plane conductivity of PVDF membrane by ten orders of magnitude,and also exhibits anisotropic conductivity distribution.Additionally,the prepared composite conductive membrane demonstrates excellent flexibility and stability,indicating a promising application potential.
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