La3+ doped at A-position improves the energy storage density of BNT-based lead-free energy storage ceramics

IF 3.1 4区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Current Applied Physics Pub Date : 2025-09-23 DOI:10.1016/j.cap.2025.09.023

Yanchun Hu, Ying Zhao, Wenke Ma, Xianwei Wang

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Abstract

As an important energy storage device, dielectric capacitor plays an irreplaceable role in modern electronic and power systems because of its characteristics of fast charging, high output, long life and high temperature stability. Among various dielectric materials, Bi_0.5Na_0.5TiO₃-based energy storage ceramics with high saturation polarization are limited due to high conductivity and high residual polarization. In this paper, Bi_(0.5-x)Na_0.5La_xTiO₃ (denoted as BNL_xT) ceramic was prepared by solid state reaction method. By introducing La³⁺ at A position, the Bi_0.5Na_0.5TiO₃-based lead-free ceramic was modified to improve its relaxation characteristics and breakdown strength, so as to achieve the purpose of increasing energy storage density and energy storage efficiency. The introduction of La³⁺ at A position creates a wide temperature platform between dielectric anomalies, indicating that La³⁺ can effectively induce the relaxation characteristics of BNT ceramics. The breakdown strength is increased from 136 kV/cm of pure BNT ceramics to 198 kV/cm of Bi_0.455Na_0.5La_0.045TiO₃ ceramics, which is 1.46 times higher than before. The residual polarization decreased from 49.24 μC/cm² to 35.29 μC/cm², and the effective energy storage density increased from 0.80J/cm³ to 2.07J/cm³, an increase of 2.58 times than before. In addition, the energy storage efficiency achieved a transformation of 10.39 %–26.87 %, which is 2.59 times higher than pure BNT. The results show that La³⁺ can effectively induce the relaxation characteristics of BNT ceramics, improve the effective energy storage density and energy storage efficiency, and is a good dopant to optimize the energy storage performance of BNT-based ceramics, providing feasibility for optimizing the energy storage performance of BNT-based ceramics.

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在a位掺杂La3+提高了bnt基无铅储能陶瓷的储能密度

介质电容器作为一种重要的储能器件，以其快速充电、高输出、长寿命、高温稳定等特点，在现代电子和电力系统中发挥着不可替代的作用。在各种介电材料中，高饱和极化的bi0.5 na0.5 tio3基储能陶瓷由于电导率高、残余极化高而受到限制。本文采用固相反应法制备了Bi(0.5-x)Na0.5LaxTiO3 （BNLxT）陶瓷。通过在A位引入La3+，对bi0.5 na0.5 tio3基无铅陶瓷进行改性，改善其弛豫特性和击穿强度，从而达到提高储能密度和储能效率的目的。在A位置引入La3+，在介电异常之间形成了宽的温度平台，表明La3+可以有效诱导BNT陶瓷的弛豫特性。击穿强度由纯BNT陶瓷的136 kV/cm提高到Bi0.455Na0.5La0.045TiO3陶瓷的198 kV/cm，提高了1.46倍。剩余极化从49.24 μC/cm2降低到35.29 μC/cm2，有效储能密度从0.80J/cm3增加到2.07J/cm3，提高了2.58倍。此外，储能效率实现了10.39% - 26.87%的转化，是纯BNT的2.59倍。结果表明，La3+能有效诱导BNT陶瓷的弛豫特性，提高有效储能密度和储能效率，是优化BNT基陶瓷储能性能的良好掺杂剂，为优化BNT基陶瓷储能性能提供了可行性。

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来源期刊

Current Applied Physics 物理-材料科学：综合

CiteScore

4.80

自引率

0.00%

发文量

213

审稿时长

33 days

期刊介绍： Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications. Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques. Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals. Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review. The Journal is owned by the Korean Physical Society.