High Energy Density Performance of Polymer Nanocomposites Induced by Designed Formation of BaTiO3@sheet-likeTiO2 Hybrid Nanofillers

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• 作者：Ran Su ; Zhengdong Luo ; Dawei Zhang ; Yang Liu ; Zhipeng Wang ; Junning Li ; Jihong Bian ; Yanxi Li ; Xinghao Hu ; Jinghui Gao ; Yaodong Yang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 9, 2016
• 年：2016
• 卷：120
• 期：22
• 页码：11769-11776
• 全文大小：463K
• 年卷期：0
• ISSN：1932-7455

文摘

Nanocomposites incorporating inorganic nanoparticles (NPs) within ferroelectric polymeric matrices have great potential for high density energy capacitors. In this strategy, employing the nanostructures with specially designed morphology as fillers would notably improve the energy storage. However, this strategy is extremely challenging and has not been largely explored. Here, the BaTiO₃@sheet-likeTiO₂ core–shell NPs have been successfully synthesized, and can be well-dispersed into polyvinylidene fluoride (PVDF) matrices. The nanocomposites with the volume fraction 2.5% BT@TiO₂ NPs have higher the electric displacement (6.0 μm/cm²) than that of PVDF films with the 2.5 vol % BaTiO₃ (BT) NPs (5.1 μm/cm²) under the same electric field of 350 kV/mm, which is mainly ascribed to the hierarchical interfacical polarization induced by the large surface area of TiO₂ sheet assembled on BT NPs in the nanocomposites. Simultaneously, the medium permittivity TiO₂ with medium ε_r as a buffer layer between the BT NPs and polymer matrix could minimize the inhomogeneous electric field in the nanocomposites, which results in the enhancement of the breakdown strength (490 kV/mm with 2.5 vol % BT@TiO₂ NPs) compared to pristine PVDF. As a result of a gratifying E_B and D, the energy density of the nanocomposites with 2.5 vol % BT@TiO₂ NPs reached 17.6 J/cc.