Microstructures and energy storage property of sandwiched BZT-BCT@Fe3O4/polyimide composites
Microstructures and energy storage property of sandwiched BZT-BCT@Fe3O4/polyimide composites
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DOI：
10.1007/s10854-018-0280-x
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
Q. Chi;Zhi-kai Gao;Changhai Zhang;Tiandong Zhang;Yang Cui;Xuan Wang;Q. Lei
中科院分区：
文献类型：
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作者：
Q. Chi;Zhi-kai Gao;Changhai Zhang;Tiandong Zhang;Yang Cui;Xuan Wang;Q. Lei
本文研究了三明治结构的聚酰亚胺复合薄膜，其中BZT-BCT@ Fe 3 O 4/PI复合薄膜的两侧覆盖两层纯聚酰亚胺薄膜。结果表明，掺杂BZT-BCT@ Fe 3 O 4的复合薄膜具有显著的介电性能。利用XRD、TEM和SEM等手段研究了BZT-BCT@ Fe 3 O 4复合膜和三明治复合膜的物相和微观结构。结果表明，Fe_3O_4在BZT-BCT表面呈无规包覆状态。复合膜的介电性能测试表明，复合膜的介电常数有很大的提高。复合膜的介电强度随填料体积分数的增加而降低，但当填料体积分数低于5vol. %时，复合膜的介电强度较高。能量存储密度在小体积分数下显著增加，但在7体积%下显著降低这是由于降低的介电强度。当复合膜的体积分数小于7%时，复合膜具有较高的储能密度和优异的放电效率，在265 kV/mm时，放电效率仍高于85%。
In this paper, the sandwich structured polyimide composite films were studied, in which two layers of pure polyimide films were covered on both sides of BZT-BCT@Fe3O4/PI composite films. The result indicated that composite films with doped BZT-BCT@Fe3O4had a significant performance in dielectric properties. The phases and microstructures of BZT-BCT@Fe3O4and sandwiched composite films were studied by means of XRD, TEM and SEM. It was found that Fe3O4was present and randomly coated on BZT-BCT. The measured dielectric properties of the composite films show great increased dielectric constant. The dielectric strength of the composite films decreases with the volume fraction raising, however, the relatively high values can be obtained when the fillers content is lower than 5 vol.%. The energy storage density increases significantly at small volume fractions, but decreases significantly at 7 vol.% due to reduced dielectric strength. On the whole, the composite films exhibit higher energy storage density and excellent discharge efficiency when the volume fraction is less than 7%, and the discharge efficiency is still higher than 85% at 265 kV/mm.