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Entropy-Driven Conformational Disorder Enables Outstanding High-Temperature Energy Storage in Dielectric Polymers.

Hongfei Li¹, Sifan Chen¹, Dingqu Liu¹

¹Shanghai Engineering Research Center of Advanced Thermal Functional Materials, Shanghai Polytechnic University, Shanghai, China.

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Summary

This summary is machine-generated.

Researchers developed a novel random copolymerized polyimide (R-PI) using an entropy-driven strategy. This material achieves superior high-temperature dielectric performance by suppressing charge leakage, enabling advanced energy storage solutions.

Keywords:

conformational entropy electron localization energetic disorder high‐temperature energy storage random copolymers

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Area of Science:

Materials Science
Polymer Chemistry
Electrical Engineering

Background:

High-temperature polymer dielectrics face a trade-off between electrical insulation and thermal stability.
Aromatic polyimides (PI) exhibit thermal resistance but suffer from charge leakage due to π-π stacking, limiting high-temperature applications.

Purpose of the Study:

To overcome the limitations of conventional polyimides for high-temperature energy storage.
To design a polyimide with enhanced dielectric properties through an entropy-driven conformational disorder strategy.

Main Methods:

Developed a ternary random copolymerized polyimide (R-PI) to maximize conformational entropy.
Utilized density functional theory (DFT) and molecular dynamics (MD) to analyze structural and electronic properties.
Investigated the effect of dynamic conformational flipping on π-conjugation and charge transport.

Main Results:

The R-PI exhibited maximized conformational entropy (ΔS_conf = 5.76 J/(mol·K)) with decoupled π-conjugation and localized electrons.
Computational studies revealed a fluctuating electrostatic potential field creating deep energy traps that suppress charge carrier transport.
The optimal R-PI-0.5 achieved a discharged energy density of 6.12 J/cm³ with 91.1% efficiency at 200°C and 650 MV/m.

Conclusions:

The entropy-driven conformational disorder strategy effectively enhances dielectric performance at high temperatures.
This molecular design paradigm offers a pathway for developing next-generation harsh-environment energy storage materials.
The R-PI demonstrates potential for advanced applications requiring robust high-temperature dielectrics.