Energy Storage in Ferroelectric Polymer Nanocomposites Filled with Core鈥揝hell Structured Polymer@BaTiO3 Nanoparticles: Understanding the Role of Polymer Shells in the Interfacial Regions

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• 作者：Ming Zhu ; Xingyi Huang ; Ke Yang ; Xing Zhai ; Jun Zhang ; Jinliang He ; Pingkai Jiang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：November 26, 2014
• 年：2014
• 卷：6
• 期：22
• 页码：19644-19654
• 全文大小：791K
• ISSN：1944-8252

文摘

The interfacial region plays a critical role in determining the electrical properties and energy storage density of dielectric polymer nanocomposites. However, we still know a little about the effects of electrical properties of the interfacial regions on the electrical properties and energy storage of dielectric polymer nanocomposites. In this work, three types of core鈥搒hell structured polymer@BaTiO₃ nanoparticles with polymer shells having different electrical properties were used as fillers to prepare ferroelectric polymer nanocomposites. All the polymer@BaTiO₃ nanoparticles were prepared by surface-initiated reversible-addition鈥揻ragmentation chain transfer (RAFT) polymerization, and the polymer shells were controlled to have the same thickness. The morphology, crystal structure, frequency-dependent dielectric properties, breakdown strength, leakage currents, energy storage capability, and energy storage efficiency of the polymer nanocomposites were investigated. On the other hand, the pure polymers having the same molecular structure as the shells of polymer@BaTiO₃ nanoparticles were also prepared by RAFT polymerization, and their electrical properties were provided. Our results show that, to achieve nanocomposites with high discharged energy density, the core鈥搒hell nanoparticle filler should simultaneously have high dielectric constant and low electrical conductivity. On the other hand, the breakdown strength of the polymer@BaTiO₃-based nanocomposites is highly affected by the electrical properties of the polymer shells. It is believed that the electrical conductivity of the polymer shells should be as low as possible to achieve nanocomposites with high breakdown strength.

Keywords:

dielectric constants; breakdown strength; core鈭抯hell nanoparticles; energy storage; nanocomposite; reversible-addition鈭抐ragmentation chain transfer (RAFT) polymerization; poly(vinylidene fluoride)