Montmorillonite/PVDF-HFP-based energy conversion and storage films with enhanced piezoelectric and dielectric properties

摘要

Energy conversion and storage devices are considered to be potential candidates for application in health monitoring, smart-sensor and clean-energy harvesting. In this study, Li+ modified montmorillonite/poly(vinylidene fluoride-co-hexafluoropropylene) (MMT(Li)/PVDF-HFP) with energy conversion and storage abilities were prepared, and the effects of Li+ ions and adsorbed water on phase transformation as well as dielectric and piezoelectric performance were studied. MMT(Li)/PVDF-HFP composite film with 15 wt% MMT and 1.72 wt% H2O exhibited the good energy conversion and storage performances with high dielectric constant, generated current, open circuit voltage and holding time because of the Li+ polarization and beta-phase nucleation by hydrogen bonds. Therefore, MMT modified by ion and H2O was an effective reinforce filler to prepare excellent energy conversion and storage film. We hope this modification method could inspire the performance optimization of other clay/polymer in the flexible electronic field.