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High-Energy-Density Waterborne Dielectrics from Polyelectrolyte-Colloid Complexes

机译：High-Energy-Density Waterborne Dielectrics from Polyelectrolyte-Colloid Complexes

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摘要

To meet the demands of miniaturization and integration of next-generationpower systems, a major challenge is to improve the energy density of useddielectric capacitors. Polymer nanocomposites are of great potential forhigh-energy-density capacitors. However, most of them are prepared via meltblending at high temperatures or solution processing in hazardous organicsolvents, which are energy consuming and environmentally problematic. Ithas long remained economically and ecologically challenging to develop newdielectric materials. Here, a class of high-energy-density dielectrics madeby electrostatically complexing polyvinylidene fluoride (PVDF) latex withoppositely charged chitosan in an aqueous phase is reported. At the chargeneutralization point, the film of PVDF@Chitosan complexes demonstratesthe highest breakdown strength (630 MV m~(?1)) and recoverable energy density(10.1 J cm~(?3)), which are respectively 279% and 421% higher than the barePVDF latex film, and far beyond most of the conventional solvent- or meltprocessedpolymer films. The largely improved capacitive performancesare ascribed to the significant minimization of losses at the critical chargeneutralization point. The concept can be extended to a wide range of colloids,including polystyrene latex and aqueous bentonite suspension, highlightingthe versatility of the proposed approach to develop environmentally friendlyhigh-performance capacitors.

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