Polypyrrole/polyvinylidene fluoride composite film with sandwich structure, and preparation method thereof

Abstract

The invention discloses a preparation method of a polypyrrole / polyvinylidene fluoride composite film with a sandwich structure, and belongs to the application field of high-energy-storage-density dielectric capacitors. The problem that the breakdown strength is too low due to filler doping is solved. The composite film is divided into three layers, the upper layer and the lower layer are polyvinylidene fluoride films, and the middle layer is a doped polypyrrole / polyvinylidene fluoride composite film. The upper layer and the lower layer are prepared by a tape casting method; the middle layer is prepared by adopting an electrostatic spinning method; and the sandwich structure composite film is obtained through a hot pressing method. By introducing the sandwich structure, the breakdown strength of the composite film is greatly improved, and the composite film has relatively low loss. The polypyrrole / polyvinylidene fluoride composite film with the sandwich structure has excellent energy storage performance, is simple and safe in design scheme, has good potential in the field of energy storage, and particularly has more obvious effects in the aspects of miniaturization, light weight and integration of electrical and electronic equipment.

Description

technical field [0001] The invention belongs to the application field of high energy storage density dielectric capacitors and specifically relates to a sandwich structure polypyrrole / polyvinylidene fluoride composite film and a preparation method thereof. Background technique [0002] Today, human consumption and dependence on energy are increasing day by day. How to effectively store energy and reduce energy loss has become a hot research topic. Due to the fast charging speed and high discharge rate, dielectric capacitors have high application value. However, the main disadvantage of dielectric capacitors is their low energy density, which cannot meet the growing demands of advanced applications. The dielectric layer of a dielectric capacitor is a polymer, so it is necessary to increase the energy storage density by developing polymer matrix composites with excellent dielectric properties. Typically, it can be achieved by adding ferroelectric or conductive fillers in th...

AI Technical Summary

Problems solved by technology

However, in order to alleviate the problem of decreased breakdown strength caused by the addition of fillers, it is necessary to design composite films with a sandwich structure

[0004] The present invention solves the technical problem of low breakdown strength caused by doping fillers; and provides a sandwich structure polypyrrole / polyvinylidene fluoride composite film and its preparation method

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