模板法构筑三维钛酸钡/聚乙烯醇-氮化硼柔性电介质材料的介电储能特性  

Investigation of Flexible Dielectric Composites Based on Three-dimensional Barium Titanate/Polyvinyl Alcohol-Boron Nitride Constructed by Template Method

作　　者：杨永志 姜芃 晁巾翔 李雨凡 李永明 李玉超[1] YANG Yongzhi;JIANG Peng;CHAO Jinxiang;LI Yufan;LI Yongming;LI Yuchao(School of Materials Science and Engineering,Liaocheng University,Liaocheng 252059,China)

机构地区：[1]聊城大学材料科学与工程学院,聊城252059

出　　处：《高电压技术》2024年第6期2382-2389,共8页High Voltage Engineering

基　　金：国家自然科学基金(52177020);聊城大学大学生创新创业项目(CXCY2022184,CXCY2021109)。

摘　　要：为研究三维钛酸钡(3DBT)网络结构和BN含量对复合体系介电储能特性的影响规律,以无尘纸为模板,溶胶凝胶法制备3DBT陶瓷网络;然后将含有不同比例氮化硼(BN)纳米片/聚乙烯醇溶液(PVA-BN)反向引入到3DBT网络中,制得了3DBT/PVA-BN复合电介质材料。研究表明,反向引入PVA溶液能够实现其对3DBT的有效包埋,赋予3DBT良好的柔韧性。当PVA达到饱和时,3DBT网络的质量分数约为27%(体积分数6.9%)。其中,3DBT/PVA-0.50%BN复合电介质材料表现出综合的介电储能特性,其介电常数和储能密度为18.1(1kHz)和1.24J/cm~3(90k V/mm下),分别是传统方法制备27%nano-BT/PVA复合材料的1.74和3.54倍。此外,获得的3DBT/PVA-BN介电材料具有更好的热稳定性,表现出良好的应用前景。Three-dimensional barium titanate(3DBT)ceramic network was prepared by sol-gel method using cleanroom wipers as template.Different contents of boron nitride(BN)nanosheets/polyvinyl alcohol(PVA-BN)solution were reversely introduced into the 3DBT network,resulting in flexible 3DBT/PVA-BN composite dielectric film.The study shows that PVA solution can be effectively embedded into 3DBT framework via reverse infiltration,endowing the material with excellent flexibility.The mass fraction of 3DBT in a saturated 3DBT/PVA-BN composite is about 27%(volume fraction 6.9%).What’s more,the 3DBT/PVA-0.50%BN system exhibits comprehensive dielectric and energy storage performances.The dielectric constant and energy storage density of 3DBT/PVA-0.50%BN composites are 18.1(at 1 kHz)of 1.24 J/cm3(at 90 kV/mm),being 1.74 and 3.54 times higher than those of traditional 27%nano-BT/PVA composite,respectively.In addition,the obtained 3DBT/PVA-BN dielectric film possesses better thermal stability,implying good application prospects.

关 键 词：介电常数 储能密度 三维钛酸钡 氮化硼 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]