Scalable room-temperature dielectric switchable composites with giant contrast ratio and great cycle stability

Gong, Yutie; Li, Zhenzhen; Li, Hairong; Zhou, Weijie; Zhao, Jiayu; Pei, Xianglin; Jiang, Ming; Gong, Wei

doi:10.1016/j.coco.2022.101407

Cited by 6 publications

(15 citation statements)

References 30 publications

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“…This switching ratio is 4 orders of magnitude higher than the highest (320.6) that has been reported so far. [35] It is noteworthy that the emulsion has an ε′ ratio above 7526 even at higher frequencies (e.g., 10 4 Hz). This suggests the emulsion ultra-high dielectric switching ratios over most of the tested frequency range.…”

Section: Dielectric-switching Effects Caused By Dual Polarization Syn...mentioning

confidence: 96%

“…The structural evolution of the composite system during the crystallization-melting transition of the emulsion leads to impressive dielectric switching behavior and dielectric bistability, which appears to be similar to previous work. [33][34][35][36] In fact, there are essential differences between them, both in terms of mechanism and property.…”

Section: Dielectric-switching Effects Caused By Dual Polarization Syn...mentioning

confidence: 99%

“…Our recent studies [35,36] demonstrate that significantly enhanced dielectric switching ratios can be obtained by modulating the competition between electrode polarization and interfacial polarization. For example, [35] the phase transition of polyethylene glycol has been exploited to alter the mobility of ionic liquid, greatly enhancing the electrode polarization in the molten state, resulting in the highest dielectric switching ratio reported to date (320.6), as shown in Situation 1 of Figure 1c. Alternatively, the opposite approach [36] is used to obtain a high dielectric switching ratio by inhibiting the electrode polarization using the polymer matrix and instead enhancing the interfacial polarization at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…These solid-phase systems not only provide an appreciable dielectric switching ratio, but also excellent stability and mechanical properties. This series of studies [33][34][35][36] all suggest that a change in polarization state due to a significant structural phase transition (e.g., solid/liquid phase transition) is the most promising way to obtain a high dielectric switching ratio. Although the aforementioned composite systems based on interfacial polarization and electrode polarization, respectively, have achieved important success in improving the dielectric switching ratio.…”

Section: Introductionmentioning

confidence: 99%

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Unparalleled Dielectric‐Switching Effects Caused by Dual Polarization Synergy

Gong

Zhao

et al. 2023

Adv Funct Materials

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Dielectric switching materials are prospective candidates for smart electronic/electrical applications, and high dielectric switching ratios are crucial for their practical applications. However, the substantial improvement of the dielectric switching ratio is limited by the available dielectric switching mechanisms, and obtaining high dielectric switching ratios is a major challenge. Here, an unparalleled dielectric switching effect is reported in a water‐in‐oil emulsion system, caused by dual polarization synergy below the dielectric transition temperature in concert with suppression of the electrode polarization above the dielectric transition temperature. The synergistic dielectric switching effect of interfacial polarization and electrode polarization endows the emulsion with unprecedentedly high dielectric switching ratios. The highest room temperature dielectric switching ratio of this emulsion system up to 2.86 × 106 at 20 Hz, is four orders of magnitude higher than the highest switching ratio reported so far. The unparalleled high dielectric switching ratio, reliable cycle stability, good frequency adaptability, and satisfactory scalability make the inorganic salt solution/octadecane emulsions potentially excellent candidates for high‐sensitivity room‐temperature smart switching or sensing devices.

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Section: Dielectric-switching Effects Caused By Dual Polarization Syn...mentioning

confidence: 96%

Section: Dielectric-switching Effects Caused By Dual Polarization Syn...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unparalleled Dielectric‐Switching Effects Caused by Dual Polarization Synergy

Gong

Zhao

et al. 2023

Adv Funct Materials

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“…[5][6][7][8][9] Therefore, the research of high-temperature-resistant polymer dielectrics with high dielectric constant, low loss, and high breakdown strength is the key to whether the nextgeneration film capacitors can be applied in harsh environments. [10][11][12][13][14] Polyimide (PI) has been widely applied ranging from microelectronics to aerospace due to exceptional properties, such as excellent thermal stability, outstanding chemical resistance and high mechanical strength, because of the main chain of imide structure. 15,16 Meanwhile, PI with excellent dielectric properties, including low loss factor, high breakdown strength, and high resistivity, can be applied as the high-temperature dielectric capacitors.…”

Section: Introductionmentioning

confidence: 99%

Functionalized carbon nanotubes/polyimide nanocomposites with high energy density for high‐temperature dielectric materials

Zhou

et al. 2023

J of Applied Polymer Sci

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Polymer-based dielectric capacitors have attracted much attention because of their good flexibility, lightness, and high-power density. However, the current polymer dielectric capacitors usually have too low energy density and cannot be used in high temperature environments, which limits the further development. Therefore, it has become increasingly important to develop hightemperature dielectric materials with high energy density and low dielectric loss. In this study, long-chain functionalized carbon nanotubes (CNTF) were introduced in Polyimide (PI) to obtained CNTF/PI composite film. CNTF have good compatibility with polymer and can solve the dispersion problem. The CNTF/PI composite film exhibits good dielectric property and an ultralow dielectric loss of 0.015. Especially, the discharged energy density of 3.77 J/cm 3 of CNTF/PI composite film is the highest discharged energy density of reported polyimide-based dielectric films at 300 MV/m. Therefore, these polyimide-based dielectric materials are promising in the high temperature field of novel high-performance film dielectric capacitor. K E Y W O R D Sdielectric property, high-temperature dielectric materials, long-chain functionalized carbon nanotubes, polyimide

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Relaxation‐Induced Significant Room‐Temperature Dielectric Pulsing Effects

Gong

et al. 2023

Adv Funct Materials

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Thermo‐responsive dielectric materials are in urgent demand owing to the rapid development of smart electronic/electrical systems. Although different types and structures of thermally responsive dielectric materials have been continuously reported, their dielectric response behaviors all originate from thermodynamic phase transitions. Herein, it is demonstrated that structural relaxation in poly(vinylidene fluoride) (PVDF), a non‐thermodynamic phase transition, can induce a significant thermal dielectric pulse at room temperature. The dielectric pulse strength of up to 6.3 × 105 at 20 Hz, with a dielectric pulsing temperature of 24 °C, is achieved from polyethylene glycol (PEG)‐PVDF coaxial nanofibrous films (PVDF@PEG), fabricated via a continuous blow spinning method. Moreover, the films exhibit excellent flexibility, adjustable strength and toughness, switchable hydrophilicity/hydrophobicity, and effective thermal management capability. The relaxation‐induced dielectric pulsing effect, outstanding multifunctionality, and simple preparation combine to promote further scalability and prospects of PVDF@PEG. In particular, the work contributes to the discovery of the relaxation‐induced dielectric response mechanism, which provides a new strategy for the generation of thermo‐responsive dielectric materials.

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Scalable room-temperature dielectric switchable composites with giant contrast ratio and great cycle stability

Cited by 6 publications

References 30 publications

Unparalleled Dielectric‐Switching Effects Caused by Dual Polarization Synergy

Unparalleled Dielectric‐Switching Effects Caused by Dual Polarization Synergy

Functionalized carbon nanotubes/polyimide nanocomposites with high energy density for high‐temperature dielectric materials

Relaxation‐Induced Significant Room‐Temperature Dielectric Pulsing Effects

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