Realizing excellent energy-storage performance under low electric fields in lead-free BiFeO3-BaTiO3-based ceramics with ultrahigh polarization difference

IF 8.9 2区 工程技术 Q1 ENERGY & FUELS
Jinbo Zhang , Yongping Pu , Yuxin Hao , YiLe Yang , Lei Zhang , Bo Wang , Qiao Pan
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Abstract

Amidst the swift progress of electronic devices, there's an escalating need for capacitors to attain heightened energy storage capabilities (> 5 J/cm3) under low electric fields(< 300 kV/cm), facilitating integration and downsizing. In this research, (0.67-x)BiFeO3–0.33BaTiO3-xLaAlO3 (x = 0–0.07) ceramics with ultrahigh polarization difference (ΔP = Pmax-Pr) were successfully synthesized via the traditional solid-phase method. Initially, the progressive substitution of LaAlO3 was found by XRD Rietveld refinement, PFM, and dielectric spectroscopy analysis to lead to a phase transition from the R3c phase to the Pm3m phase, obtaining ultra-small and highly electric field responsive PNRs, thus facilitating the relaxation behavior and achieving low Pr values. Moreover, the introduction of La3+ enables the 0.67BiFeO3–0.33BaTiO3 ceramics leading to an increased deviation of Bi ions from the centre, which maintains a relatively high Pmax to achieve an ultrahigh ΔP (~52.43 μC/cm2), resulting in excellent energy storage density (Wrec ~ 5.71 J/cm3) under relatively low electric fields (270 kV/cm), along with super temperature stabilities. This study offers an effective pathway to explore the high energy storage capabilities of dielectric capacitors under low fields.
在具有超高极化差的无铅 BiFeO3-BaTiO3 基陶瓷中实现低电场下的卓越储能性能
随着电子设备的飞速发展,人们对电容器的要求也越来越高,即在低电场(< 300 kV/cm)条件下实现更高的储能能力(> 5 J/cm3),从而促进电容器的集成化和小型化。本研究通过传统固相法成功合成了具有超高极化差(ΔP = Pmax-Pr)的 (0.67-x)BiFeO3-0.33BaTiO3-xLaAlO3 (x = 0-0.07)陶瓷。最初,通过 XRD Rietveld 精炼、PFM 和介电光谱分析发现,LaAlO3 的渐进取代导致了从 R3c 相到 Pm3m 相的相变,从而获得了超小和高电场响应的 PNR,从而促进了弛豫行为并实现了低 Pr 值。此外,La3+ 的引入使 0.67BiFeO3-0.33BaTiO3 陶瓷的 Bi 离子偏离中心的程度增加,从而保持了相对较高的 Pmax,实现了超高的 ΔP(~52.43 μC/cm2),在相对较低的电场(270 kV/cm)下实现了出色的能量存储密度(Wrec~5.71 J/cm3),并具有超强的温度稳定性。这项研究为探索电介质电容器在低电场下的高能量存储能力提供了一条有效途径。
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来源期刊
Journal of energy storage
Journal of energy storage Energy-Renewable Energy, Sustainability and the Environment
CiteScore
11.80
自引率
24.50%
发文量
2262
审稿时长
69 days
期刊介绍: Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.
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