TiO2 nano material doped double-layer polyvinylidene fluoride composite medium and preparation method thereof

Abstract

The invention discloses a TiO2 nano-material doped double-layer polyvinylidene fluoride composite medium and a preparation method thereof. The TiO2 nano-material doped double-layer polyvinylidene fluoride composite medium is characterized by comprising an upper pressure bearing layer and a lower polarization layer, wherein the upper pressure bearing layer is obtained by filling polyvinylidene fluoride with TiO2 nano-fibers arranged perpendicular to the direction of an electric field, and the lower polarization layer is obtained by filling polyvinylidene fluoride with a TiO2 nano array arranged parallel to the direction of the electric field. The preparation method comprises the following steps: casting a TO NWs / PVDF suspension on a lower polarization layer to form an upper pressure bearing layer doped with TiO2 nanofibers arranged perpendicular to the direction of an electric field, controlling the thickness ratio of the upper pressure bearing layer to the lower polarization layer to be (0.5-5):1, heating after drying in vacuum drying oven, quickly quenching in ice-water bath, and drying in the vacuum drying oven to obtain composite medium. The composite medium of the invention has the advantages that polarization and breakdown field strength can be improved at the same time.

Description

technical field [0001] The invention belongs to the field of dielectric capacitors, in particular to a TiO 2 A nanomaterial-doped double-layer polyvinylidene fluoride composite medium and a preparation method thereof. Background technique [0002] For linear dielectric materials, the calculation of energy density can be expressed as , according to this formula, it can also be seen that the dielectric constant or breakdown strength E b The enhancement can lead to the improvement of energy density. Therefore, in order to meet the needs of the development of modern electronic power systems, the pursuit of dielectric materials with high dielectric constant, high breakdown strength, and low energy loss is the top priority for improving the energy storage capacity of dielectric capacitors. In order to obtain dielectric capacitors with excellent energy storage performance, people introduce inorganic nano-ceramic materials with high dielectric constant into polymer matrix wit...

AI Technical Summary

Problems solved by technology

According to the research status of polymer-based dielectric capacitors, the improvement of the dielectric constant of single-layer nanocomposites is usually at the expense of the breakdown strength of the polymer, because of the huge dielectric difference produced by the addition of high-permittivity inorganic materials. It will lead to serious distortion of the local electric field, thereby reducing the breakdown field strength

Therefore, a single inorganic material combined with a polymer cannot satisfy both the dielectric constant and the breakdown field strength.

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