Achieving an ultra-high capacitive energy density in ferroelectric films consisting of superfine columnar nanograins

Zhao, Yuchen; Ouyang, Jun; Wang, Kun; Yuan, Miao; Gao, Yifan; Su, Yu; Cheng, Hongbo; Liu, Meilin; Yang, Qiong; Pan, Wei

doi:10.1016/j.ensm.2021.04.010

Cited by 50 publications

(54 citation statements)

References 45 publications

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“…The obtained energy storage performance through building up double gradient multilayer is superior to the reported lead-based or lead-free film capacitors (Figure 5d). [5,16,[23][24][25][26][27][28][29][30][31][32][33][34] Working in such high and wide temperatures already meets the requirements for various areas, such as the hybrid car, underground oil exploration and so on, as well as can greatly reduce the cost and weight of the device.…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh Temperature Lead‐Free Film Capacitors via Strain and Dielectric Constant Double Gradient Design

Fan

et al. 2021

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With the development of miniaturization, lightweight and integration of electronic devices, the demand for high‐temperature dielectric capacitors is becoming urgent. Nevertheless, the breakdown strength and polarization are deteriorated at high temperatures due to the thermal energy assisting the electron transport and impeding the dipole alignment. Here, a structure of capacitor with double gradients of dielectric constant gradient and strain gradient is designed to achieve high breakdown strength, high working temperature, and high energy storage density simultaneously. It is found that the designed structure of BaHf0.17Ti0.83O3/1mol% SiO2 doped BaZr0.35Ti0.65O3/0.85BaTiO3‐0.15Bi(Mg0.5Zr0.5)O3 exhibits excellent energy storage performance. The energy storage density of 127.3 J cm−3 with an energy storage efficiency of 79.6% is realized in the up‐sequence multilayer with period N = 2 at room temperature. Moreover, when the working temperature varies from −100 to 200 °C, the energy storage density of the N = 4 capacitor keeps stably at 84.62 J cm−3 with an energy storage efficiency 78.42% at 6.86 MV cm−1. All these properties promise great potential applications of the designed multilayer capacitors with the double gradients in harsh environments, and the design principle can be applicable to other systems to boost working temperature.

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Section: Resultsmentioning

confidence: 99%

Ultrahigh Temperature Lead‐Free Film Capacitors via Strain and Dielectric Constant Double Gradient Design

Fan

et al. 2021

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“…On the other hand, phase field model has recently been adopted as an efficient method for analysis‐aided design of ferroelectric nanostructure for energy storage. [ 55 ] Thus, the development of phase field model for CGFE thin film provides a useful approach for further investigations on energy storage in such interesting composition gradient systems.…”

Section: Resultsmentioning

confidence: 99%

Abnormal Electromechanical Property of Nonlinearly Graded Lead‐Free Ferroelectric Thin Films

Lich

Bui

Shimada

et al. 2021

Advcd Theory and Sims

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A phase field model for nonlinearly graded ferroelectric thin films is developed based on the Ginzburg–Landau theory. The developed phase field model is validated by comparing simulated results and available experiment data. Via phase field simulations, effects of gradient index on polarization field and electromechanical response are systematically investigated. Anomalously large electromechanical responses are explored in nonlinearly graded ferroelectric thin films made of Ba1−x$_{1-x}$SrxTiO3, where SrTiO3 mole fraction varies across the film thickness according to power‐law relationships. In addition, a large gradient of polarization can be stabilized in graded ferroelectric thin films, where both magnitude and gradient of polarization can be manipulated by controlling the gradient index of thin films. The remarkable enhancement of electromechanical properties originates from the large gradient of polarization in thin films, which makes the polarization field more susceptible to external excitation. An optimal gradient index for maximizing the electromechanical response is also identified. Furthermore, a consideration of energy properties of graded thin films suggests that both energy storage density and charge–discharge efficiency increase with increasing gradient index of thin films.

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“…The energystorage capacity achieved here surpasses most of the reported values for lead-free and lead-based systems. [4,5,11,12,47,54] The superior energy-storage performance in a wide variety of polar topologies demonstrates that FE multilayers show promise for use as energy-storage media.…”

Section: Energy-storage Performancementioning

confidence: 99%

Phase‐Field Simulations of Tunable Polar Topologies in Lead‐Free Ferroelectric/Paraelectric Multilayers with Ultrahigh Energy‐Storage Performance

Liu

Pan

Cheng³

et al. 2022

Advanced Materials

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Dielectric capacitors are emerging energy-storage components that require both high energy-storage density and high efficiency. The conventional approach to energy-storage enhancement is polar nanodomain engineering via chemical modification. Here, a new approach of domain engineering is proposed by exploiting the tunable polar topologies that have been observed recently in ferroelectric/paraelectric multilayer films. Using phase-field simulations, it is demonstrated that vortex, spiral, and in-plane polar structures can be stabilized in BiFeO 3 /SrTiO 3 (BFO/STO) multilayers by tailoring the strain state and layer thickness. Various switching dynamics are realized in these polar topologies, resulting in relaxor-ferroelectric-, antiferroelectric-, and paraelectric-like polarization behaviors, respectively. Ultrahigh energy-storage densities above 170 J cm −3 and efficiencies above 95% are achievable in STO/ BFO/STO trilayers. This strategy should be generally implementable in other multilayer dielectrics and offers a new avenue to enhancing energy storage by tuning the polar topology and thus the polarization characteristics.

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Achieving an ultra-high capacitive energy density in ferroelectric films consisting of superfine columnar nanograins

Cited by 50 publications

References 45 publications

Ultrahigh Temperature Lead‐Free Film Capacitors via Strain and Dielectric Constant Double Gradient Design

Ultrahigh Temperature Lead‐Free Film Capacitors via Strain and Dielectric Constant Double Gradient Design

Abnormal Electromechanical Property of Nonlinearly Graded Lead‐Free Ferroelectric Thin Films

Phase‐Field Simulations of Tunable Polar Topologies in Lead‐Free Ferroelectric/Paraelectric Multilayers with Ultrahigh Energy‐Storage Performance

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