Improved dielectric and energy storage properties of three-dimensional BaTiO3/polyvinyl alcohol-boron nitride flexible dielectric composite via template infiltration strategy

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Yongzhi Yang, Jinxiang Chao, Peng Jiang, Runhan Xu, Yuchao Li, Yanhu Zhan, Zhicheng Shi, Chengzhu Liao
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Abstract

Continuous three-dimensional BaTiO3 (3DBT) ceramic network was prepared by the sol-gel method using cleanroom wipers as the template. Subsequently, flexible 3DBT/polyvinyl alcohol-boron nitride nanosheets (PVA-BNNS) composite dielectric films were facilely fabricated by inversely introducing different BNNS concentrations of PVA-BNNS solution into the 3DBT network. The results demonstrated that PVA solution effectively embedded into the 3DBT framework through an inverse infiltration process, thereby endowing the material with excellent flexibility. The content of 3DBT in the saturated 3DBT/PVA-BNNS composite was ∼27 wt% (6.9 vol%). In addition, the 3DBT/PVA-1.0%BNNS system exhibited an excellent dielectric constant of 17.4 (at 1 kHz), a high breakdown strength of 114.5 kV·mm−1 and an energy density of 2.51 J·cm−3 (at 110 kV·mm−1), being 1.67, 1.58 and 7.17 times higher than those of traditional fabricated 27 wt% nano-BT/PVA (at 70 kV·mm−1) composite, respectively. What's more, the obtained 3DBT/PVA-BNNS dielectric film exhibited superior thermal and mechanical stability, indicating potential applications in harsh environments.

Abstract Image

通过模板浸润策略改善三维 BaTiO3/ 聚乙烯醇-氮化硼柔性介电复合材料的介电和储能性能
以洁净室擦拭布为模板,采用溶胶-凝胶法制备了连续的三维 BaTiO3(3DBT)陶瓷网络。随后,将不同浓度的 PVA-BNNS 溶液反向引入 3DBT 网络,轻松制备出柔性 3DBT/ 聚乙烯醇-氮化硼纳米片(PVA-BNNS)复合介质薄膜。结果表明,PVA 溶液通过反向渗透过程有效地嵌入了 3DBT 框架,从而使材料具有优异的柔韧性。饱和 3DBT/PVA-BNNS 复合材料中的 3DBT 含量为 27 wt%(6.9 vol%)。此外,3DBT/PVA-1.0%BNNS 系统显示出 17.4 的优异介电常数(1 kHz 时)、114.5 kV-mm-1 的高击穿强度和 2.51 J-cm-3 的能量密度(110 kV-mm-1 时),分别是传统制备的 27 wt%纳米-BT/PVA(70 kV-mm-1 时)复合材料的 1.67、1.58 和 7.17 倍。此外,所获得的 3DBT/PVA-BNNS 介电薄膜还具有优异的热稳定性和机械稳定性,这表明它在恶劣环境中具有潜在的应用前景。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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