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SiC@BaTiO3 core-shell fillers improved high temperature energy storage density of P(VDF-HFP) based nanocomposites

2022; Elsevier BV; Volume: 229; Linguagem: Inglês

10.1016/j.compscitech.2022.109658

1879-1050

Zhongcan Luo, Zhanwen Ye, Bo Duan, Guodong Li, Kaiyuan Li, Zijian Yang, Shiqing Nie, Tianwei Chen, Ling Zhou, Pengcheng Zhai,

Advanced Sensor and Energy Harvesting Materials

The emerging industry has put forward stricter requirements for the operating temperature of electrostatic capacitors. Improving the high temperature breakdown strength is the key issue to enhance the thermal stability of polymer-based nanocomposites. In this study, the nanoparticles which is composed of high heat conductivity coefficient core (SiC) and high dielectric constant shell (BaTiO3) were prepared and used as fillers, with the purpose of improving breakdown strength (Eb) and discharged energy storage density (Udis) of P(VDF-HFP)-based nanocomposites at high temperature. Compared with the pure polymer, the composite films, especially the films with 7.5 wt% fillers, showed great enhancements in breakdown strength and discharged energy storage density at high temperature. The average Eb reached 1524.6 kV/cm at 120 °C, which was 1.84 times of the contrast. The Udis at 120 °C was 2.05 J/cm3 (1700 kV/cm), which increased by 569.4% than that of pure polymer (at 700 kV/cm, 0.36 J/cm3). The improvement of thermal performance and Young's modulus of materials was contributing to the enhancements of thermal breakdown strength and electromechanical breakdown strength at high temperature. This study provides an effective way to prepare dielectric composites for high-temperature environment application.