All organic PVDF-based polymer composite for capacitive energy storage engineered via structural evolution

Le résumé fourni par la source

Poly(vinylidene fluoride)-based ferroelectric polymers with high dielectric constant can be harnessed for high-energy-density capacitors with fast discharge rates. However, notable losses arising from ferroelectricity and conductivity dramatically deteriorate charge-discharge efficiency, which is the central bottleneck for practical use of poly(vinylidene fluoride)-based polymers in electrostatic capacitors. Here we describe a novel composite strategy by incorporating a small fraction of semicrystalline and strongly dipolar organic molecular poly(arylene ether urea) into poly(vinylidene fluoride)/poly(methyl methacrylate) base polymer characterized by low crystallinity and moderate ferroelectric loss. The introduction of poly(arylene ether urea) into the poly(vinylidene fluoride)/poly(methyl methacrylate) base polymer is associated with a phase transition in poly(vinylidene fluoride) from a polar to a non-polar phase and with local structural changes in poly(arylene ether urea) toward a less-conjugated configuration. These structural changes are correlated with reduced ferroelectric and conductive losses while retaining a relatively large switchable polarization change. Consequently, we have achieved a large discharged energy density of 11.4 J cm −3 with efficiency over 90%. These results suggest a promising all-organic route toward improving room-temperature dielectric energy-storage performance in PVDF-based polymers.

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