Achieving synergistic improvement in dielectric and energy storage properties at high-temperature of all-organic composites <i>via</i> physical electrostatic effect

Shang, Yanan; Feng, Yu; Meng, Zhaotong; Zhang, Changhai; Zhang, Tiandong; Chi, Qingguo

doi:10.1039/d3mh01822a

Cited by 10 publications

(1 citation statement)

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“…A modified bipolar charge injection and transport model based on the Schottky injection mechanism is established to investigate the charging behavior in polymer/organic molecular semiconductors all-organic polymer composites under high operating voltage [12,20]. The current density at the interface between the electrode and the polymer/organic molecular semiconductors all-organic polymer is presented as [9,12,21],…”

Section: Methodsmentioning

confidence: 99%

High-throughput phase field simulation and machine learning for predicting the breakdown performance of all-organic composites

Liu,

Li,

Zhu

et al. 2024

J. Phys. D: Appl. Phys.

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All-organic dielectric polymers are materials of choice for modern power electronics and high-density energy storage, and their performance can be significantly improved by doping trace amounts of organic molecular semiconductors with strong electron-affinity energy to suppress charge conduction losses. Insight into the breakdown mechanism of polymers/organic molecular semiconductor composites is essential for the design of high-performance dielectric polymers. This study investigates the impact of the doping concentration of organic molecular semiconductors, dielectric constants, and trap depths on the breakdown performance of dielectric polymers under high temperature and electric fields. A modified phase-field model, incorporating deep traps and carriers’ coulomb capture radius, has been developed to facilitate high-throughput simulations of electrical breakdown in polymer/organic molecular semiconductor composites. This work accurately predicted the breakdown strength of all-organic composites using high-throughput phase-field simulation data as input for machine learning, which provides crucial theoretical support for designing all-organic composite dielectric polymers for energy storage capacitors under extreme conditions.

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Section: Methodsmentioning

confidence: 99%

High-throughput phase field simulation and machine learning for predicting the breakdown performance of all-organic composites

Liu,

Li,

Zhu

et al. 2024

J. Phys. D: Appl. Phys.

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Remarkably Boosted High‐Temperature Electrostatic Energy Storage of Polyetherimide Film Induced by TiO₂@Au@AlO_x@Au Core‐shell Nanofibers

Ren,

Lei,

Zhu

et al. 2024

Adv Funct Materials

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Polymer dielectrics have broad applications in advanced electronics and power systems. However, they suffer from low energy density and poor breakdown performance at high temperatures, limiting their applications in high‐temperature environments. Herein, TiO2@Au@AlOx@Au nanofibers with double coulomb blockade nanolayers are obtained via a physical sputtering strategy to improve the high‐temperature energy storage performance of polyetherimide composites. Experimental studies and finite elemenet phase‐field simulations demonstrate that the double‐layer coulomb blockade effect and micro‐capacitor effect of Au nanoparticles synergistically enhance the breakdown strength and dielectric permittivity of polyetherimide composite at high temperatures. Notably, the composite exhibits ultra‐high discharged energy densities of 11.33 and 9.70 J cm−3 at 150 and 200 °C, respectively, along with high charge–discharge efficiencies of 93.4% and 84%, which far exceed that of the polymer nanocomposites reported so far. Furthermore, the composite exhibits excellent charge–discharge cycling performance (>50000 cycles at 400 MV m−1) and high‐power density (1.16 MW cm−3) at 200 °C, making it an ideal candidate for high‐temperature capacitors. Hopefully, these nanofibers not only serve as excellent nanofillers for high‐temperature energy storage dielectric composites but also holds tremendous potential and inspirational significance for other applications such as electronics, biomedical fields, optics, and catalysis.

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Largely enhanced high‐temperature energy storage performance of P(VDF‐HFP) dielectric films via calcium niobate nanosheets

Lin,

Bao,

Wang

et al. 2024

Polymer Composites

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The capacitive energy‐storage capacity of most emerging devices rapidly diminishes with increasing temperature, making high‐temperature dielectrics particularly desirable in modern electronic systems. In this work, calcium niobate (Ca2Nb3O10, CNO) nanosheets have been added into poly(vinylidene fluoride‐hexafluoropropylene) (P(VDF‐HFP), PVHP), forming PVHP/CNO nanocomposites with exceptional temperature stability and ultrahigh energy storage density. Especially, at 80°C and 450 MV/m, the PVHP/0.3 wt%CNO nanocomposite shows an excellent Wrec of 10.81 J/cm3 which is higher than previous PVDF‐based composite films at high temperatures. Because of the high dielectric permittivity of CNO nanosheets and the way that the parallel organization of the nanosheets blocks the course of electrical trees, nanocomposites exhibit greater dielectric constants and breakdown field strengths simultaneously. These findings, will be helpful in the development of flexible, high‐energy‐density capacitors that have stable performance at high temperatures.Highlights A record‐high high‐temperature Wrec is obtained. Excellent temperature stability from 25 to 80°C is achieved. The incorporation of Ca2Nb3O10 nanosheets significantly enhances Eb.

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Achieving synergistic improvement in dielectric and energy storage properties at high-temperature of all-organic composites via physical electrostatic effect

Abstract: In response to the increasing demand for miniaturization and lightweight equipment, as well as the challenges of application in harsh environments, there is an urgent need to explore the new...

Cited by 10 publications

References 40 publications

High-throughput phase field simulation and machine learning for predicting the breakdown performance of all-organic composites

High-throughput phase field simulation and machine learning for predicting the breakdown performance of all-organic composites

Remarkably Boosted High‐Temperature Electrostatic Energy Storage of Polyetherimide Film Induced by TiO₂@Au@AlO_x@Au Core‐shell Nanofibers

Largely enhanced high‐temperature energy storage performance of P(VDF‐HFP) dielectric films via calcium niobate nanosheets

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Achieving synergistic improvement in dielectric and energy storage properties at high-temperature of all-organic composites via physical electrostatic effect

Abstract: In response to the increasing demand for miniaturization and lightweight equipment, as well as the challenges of application in harsh environments, there is an urgent need to explore the new...

Cited by 10 publications

References 40 publications

High-throughput phase field simulation and machine learning for predicting the breakdown performance of all-organic composites

High-throughput phase field simulation and machine learning for predicting the breakdown performance of all-organic composites

Remarkably Boosted High‐Temperature Electrostatic Energy Storage of Polyetherimide Film Induced by TiO2@Au@AlOx@Au Core‐shell Nanofibers

Largely enhanced high‐temperature energy storage performance of P(VDF‐HFP) dielectric films via calcium niobate nanosheets

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Product

Resources

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Remarkably Boosted High‐Temperature Electrostatic Energy Storage of Polyetherimide Film Induced by TiO₂@Au@AlO_x@Au Core‐shell Nanofibers