Dielectric Polymer Design for High-Temperature Energy Density
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Solution Overview
Problem
Current polymer dielectrics used in high energy density applications, such as capacitors, face limitations in withstanding high electric fields and maintaining performance at high temperatures, with commercially available materials like biaxially oriented polypropylene (BOPP) exhibiting low dielectric constant and energy density that degrades significantly above room temperature.
Innovation Solution
Development of new dielectric polymers with a band gap of 4.0-5.0 eV, glass transition temperature (Tg) between 200-250°C, and dielectric constant of 2.5-3.5, achieved through AI-assisted design and synthesis, which enables high energy density storage up to 200°C, surpassing the performance of existing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If biaxially oriented polypropylene (BOPP) is used as dielectric material, then breakdown strength is improved (700 V/μm), but dielectric constant deteriorates (2.2) and energy density deteriorates (5 J/cc) and temperature performance deteriorates
Solution Approach 1:
The patent employs composite material design by incorporating polar groups (such as carbonyl, hydroxyl, or ether oxygen) into the polymer backbone or side chains to create a dielectric material that combines high breakdown strength with enhanced dielectric constant. This allows the material to achieve both electrical insulation performance and energy storage capability simultaneously.
Solution Approach 2:
The patent modifies the polymer structure by changing chemical parameters - introducing polar functional groups with specific dipole moments and adjusting the polymer architecture (chain flexibility, crystallinity, crosslinking density) to optimize the balance between breakdown strength and dielectric constant while maintaining thermal stability.
2Quantity of substance
If polymer dielectric is designed for high energy density, then dielectric constant is improved, but breakdown strength deteriorates and thermal stability deteriorates
Solution Approach 1:
The patent applies local quality modification by introducing polar groups at specific locations within the polymer structure - either in the backbone or as side chains - to locally enhance dielectric constant without compromising the overall structural integrity and breakdown strength. The distribution and concentration of polar groups are optimized to achieve the desired property balance.
3Stability of the object's composition
If polymer dielectric operates at high temperature, then thermal stability is improved, but energy density deteriorates and dielectric constant deteriorates
Solution Approach 1:
The patent changes the thermal parameters of the polymer by introducing rigid aromatic structures, increasing crosslinking density, or adding thermal stabilizing groups to maintain structural integrity at high temperatures. Simultaneously, the polar group configuration is optimized to preserve dielectric constant and energy density capability even at elevated temperatures up to 200°C.
4Ease of manufacture
If polymer structure is simplified for ease of synthesis, then manufacturing is improved, but dielectric constant and breakdown strength deteriorate
Solution Approach 1:
The patent segments the polymer synthesis into modular steps by using commercially available monomers with standardized functional groups and employing step-growth polymerization or controlled radical polymerization methods. This allows the incorporation of polar groups through straightforward chemical reactions while maintaining high dielectric constant and breakdown strength through careful monomer selection and sequence control.
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 new polymers demonstrate record-breaking energy density of 8.3 J/cc at 200°C, significantly higher than commercial alternatives, and maintain stability and performance across a broad temperature range, addressing the limitations of existing materials in high-temperature applications.
Implementation Method 1
High energy density capacitors that make use of polymer dielectrics... capable of withstanding high electric fields at high temperatures, while possessing a high dielectric constant
Implementation Method 2
The maximum electric field that can be applied to a dielectric polymer without destroying its insulating characteristics is known as the dielectric breakdown strength
Data Source
AI summary
An exemplary embodiment of the present disclosure provides a method of designing a polymer. The method can include: providing a set of polymer data; generating a set of polymer structures; providing one or more target properties for the polymer, predicting properties of each polymer structure of the set of polymer structures, and design considerations for the set of polymer structures; and selecting one or more polymer structures from the set of polymer structures, based at least in part, on the predicted properties of the polymer structures. The polymer data can include a set of monomer structures.