Lightweight flexible polymer-based high-energy-density material and preparation method thereof

Abstract

The invention discloses a lightweight flexible polymer-based high-energy-density material and a preparation method thereof. The lightweight flexible polymer-based high-energy-density material disclosed by the invention is prepared from a fluoride ferroelectric polymer as matrix and modified graphene as a filler by the processes of solution blending, film casting, hot-press molding and the like, wherein the added graphene is subjected to one-step process green reduction and functionalization by using dopamine, and then a fluorine-containing polymer is grafted onto the surface of the graphene by a clicking chemical method, the grafted fluorine-containing polymer can improve the dispersibility of the graphene, and also can be well compatible with fluoride ferroelectric polymer matrix, and the interface bonding force between the polymer matrix and the graphene filler is enhanced. The material prepared by the method has the characteristics of light weight, good flexibility, high energy density and the like, and is applicable to preparation of advanced electronic-electrical equipments such as high-energy-density capacitors, embedded capacitors, field effect transistors and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of dielectric materials and energy storage materials, and in particular relates to a lightweight flexible polymer-based material with high energy storage density and a preparation method thereof. Background technique [0002] In recent years, dielectric materials with high energy storage density have been widely used in electronic and electrical equipment such as mobile energy storage capacitors, embedded capacitors, cable terminals, and field-effect transistors. With the rapid development of information technology and electronics industry, electronic devices are moving towards lightweight and miniaturization, and the preparation of lightweight and flexible dielectric materials with high energy storage density will be a key way to reduce the volume, quality and cost of electronic devices one. [0003] According to the theory of dielectric physics, the maximum energy storage density of dielect...

AI Technical Summary

Problems solved by technology

The addition of ceramic particles is not very effective in increasing the dielectric constant of the composite material. Usually, it is necessary to add ceramics with a volume fraction of more than 50%, so that the dielectric constant of the composite material can reach about 50, but at this time the material usually becomes Very brittle, poor mechanical properties, loses flexibility

The mechanism of adding conductive particles is to build a threshold percolation system. The amount of fillers required to be added to this system is usually relatively small (a volume fraction less than 20%), which can guarantee the mechanical properties and flexibility of the composite material to a certain extent. However, when the conductive filler is close to the percolation threshold, the dielectric loss of the composite material will increase sharply, thereby affecting the dielectric properties of the material.

At the same time, when preparing polymer-based composites, due to the polarity difference between the polymer and the filler and the agglomeration effect of the filler particles, the dispersion of the filler in the polymer matrix is ​​often poor, and the filler is incompatible with the polymer. As a result, the interface polarization is strengthened, the dielectric loss is increased, and the breakdown strength is significantly reduced, which limits the further improvement of the performance of the composite material.

There are currently no reports on this technical solution

Images