Three-Layer Resin Composite for High Energy Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polymer matrix composites struggle to achieve high permittivity and breakdown strength simultaneously, leading to low energy storage density and high dielectric loss, making them unsuitable for high-performance dielectric capacitors.
Innovation Solution
A three-layer resin-based composite material is developed, comprising aligned carbon nanotubes and polydopamine-coated barium titanate nanofibers, with a unique structural arrangement that enhances permittivity and breakdown strength through microwave curing, resulting in a material with high energy storage density and low dielectric loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If ceramic content is increased to 50 vol% or more in ceramic/polymer composite materials, then permittivity is improved, but structural defects increase and breakdown strength decreases
Solution Approach 1:
The patent applies local quality by creating a multilayer structure where different regions have different functions: the first and third layers contain conductive fillers for charge accumulation, while the second layer contains ceramic particles for high permittivity. This spatial differentiation allows each layer to optimize its specific function without compromising the overall breakdown strength, as the conductive layers protect the ceramic layer from electrical stress.
Solution Approach 2:
The patent uses composite materials by combining conductive filler particles (carbon black, graphite, or metal oxides) with ceramic particles (barium titanate, lead zirconate titanate, or calcium titanate) in a polymer matrix. This composite approach allows simultaneous achievement of high permittivity from ceramic particles and high breakdown strength from the conductive network, resolving the contradiction between these two properties.
2Length of stationary object
If conductor content is increased to achieve high permittivity through seepage phenomenon, then permittivity is improved, but dielectric loss increases and breakdown strength decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the conductor filler content within 1-30 wt% and ceramic particle content within 1-50 wt%, rather than using excessive conductor content. This controlled composition, combined with the multilayer structure, achieves high permittivity through constructive charge accumulation at interfaces while limiting dielectric loss by preventing conductor agglomeration and excessive conductivity.
3Length of stationary object
If multilayer structural composite materials are prepared to improve permittivity, then permittivity is improved, but dielectric loss and breakdown strength remain insufficient
Solution Approach 1:
The patent applies segmentation by dividing the composite material into three distinct layers with different compositions and functions. The first and third layers use conductive fillers for charge storage, while the second layer uses ceramic particles for high permittivity. This segmentation allows each layer to be optimized for its specific function, achieving high overall permittivity while maintaining high breakdown strength through the protective conductive layers.
Solution Approach 2:
The patent applies local quality by creating a multilayer structure where different regions have different functions: the first and third layers contain conductive fillers for charge accumulation, while the second layer contains ceramic particles for high permittivity. This spatial differentiation allows each layer to optimize its specific function without compromising the overall breakdown strength, as the conductive layers protect the ceramic layer from electrical stress.
4Length of stationary object
If aligned carbon nanotube bundles are used to improve dielectric properties, then permittivity is improved, but dielectric loss and breakdown strength decrease
Solution Approach 1:
The patent uses composite materials by combining conductive filler particles (carbon black, graphite, or metal oxides) with ceramic particles (barium titanate, lead zirconate titanate, or calcium titanate) in a polymer matrix. This composite approach allows simultaneous achievement of high permittivity from ceramic particles and high breakdown strength from the conductive network, resolving the contradiction between these two properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite material achieves high permittivity (>1000) and low dielectric loss (<0.6) at 100 Hz, along with a breakdown strength of 4.92, significantly improving energy storage density and making it suitable for large-scale applications.
Implementation Method 1
The energy density of linear dielectric (Ue) is proportional to the permittivity of dielectric (εr) and the breakdown strength (Eb) of the dielectric
Implementation Method 2
Mixing up the curable resin system with the aligned carbon nanotubes to obtain the aligned carbon nanotubes prepolymer
Implementation Method 3
Mixing up the curable resin system with polydopamine-coated barium titanate nanofibers to obtain barium titanate nanofiber prepolymer
Data Source
AI summary
This invention disclosed a resin-based composite material has a three-layer structure and the application thereof. According to the invention, an oriented carbon nanotube bundle/epoxy resin composite material (denoted as layer B) is prepared with the microwave curing method, a barium titanate nanofiber/epoxy resin composite material (denoted as layer E) is prepared by means of a blade coating-heat curing method, and a composite material of a B-E-B three layer structural is formed by means of a layer-by-layer curing technology. Compared to the composite material of the conductor-insulating layer/polymer layer structural prepared in the prior art, the resin-based composite material has a three-layer structure provided by the invention has with high energy storage density, and low dielectric loss and high permittivity; and the preparation process therefor is controllable and easy to operate, short in production cycle, and suitable for large-scale application.