High discharged energy density of nanocomposites filled with double-layered core-shell nanoparticles by reducing space charge polarization. Issue 16 (November 2018)

• Record Type: Journal Article
• Authors: Zhu, Yiwei; Yuan, Songliu; Lu, Chengliang; Xie, Bing; Fan, Pengyuan; Marwat, Mohsin Ali; Ma, Weigang; Liu, Kai; Liu, Hongming; Zhang, Haibo
• Is Part Of: Ceramics international. Volume 44:Issue 16(2018)
• Page Start: 19330
• Page End: 19337
• Publication Date: 2018-11
• Subjects: Nanocomposite -- Core-shell -- Energy storage properties -- Interface -- Space charge polarization; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.07.161
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Polymer-based nanocomposite capacitors for energy storage with high discharged energy density and charge-discharge efficiency are of great importance to modern electronic devices and electrical systems. Herein, the energy storage properties are improved by applying double-layered core-shell nanoparticles as fillers. The dopamine was adopted as the outermost layer to improve the dispersibility and compatibility between the fillers and matrix. The high resistance of SiO2 works as a barrier to limit the movement of space charge over the BaTiO3 (BT) surface when a high electric field is applied, leading to an enhancement of breakdown strength as well as a decreased space charge polarization, so that an enhancement of discharged energy density and charge-discharge efficiency are achieved. The SiO2 @BT/P(VDF-CTFE) also shows weaker frequency dependence, indicating the reduction of space charge polarization. A possible mechanism of reduced space charge polarization was proposed to explain the effects of SiO2 . This work demonstrates that constructing a core-shell structure with high resistance is an effective way to improve the energy properties of nanocomposite capacitors.