共沉淀析出-热压技术制备高储能性能复合材料薄膜

High energy storage performance composite films prepared by coprecipitation-hot pressing technique

高储能性能的储能电容器因其超快充放电速度、超高功率密度而在船载逆变器、光伏发电、航母弹射系统等领域受到广泛关注。提升现有电容器储能密度(Ue)能够加快实现电力电子技术设备的集成化并促进电力电子技术的快速发展。以聚偏氟乙烯-三氟氯乙烯[P(VDF-CTFE)]为基体,以线性均聚物聚甲基丙烯酸甲酯(PMMA)为填料,限制P(VDF-CTFE)的结晶及铁电相变,采用共沉淀析出-热压技术替代传统溶液流延法,以实现复合材料结构的均一性。结果显示PMMA能够在P(VDF-CTFE)中均匀分布且限制铁电弛豫损耗,结合相场模拟分析可知均匀分布的PMMA能够优化电场分布,20vol%填充量时在372 MV/m的电场下获得10.1 J/cm 3的Ue与74%的能量释放效率(η),为高储能复合电介质薄膜的实用化提供科技支撑。

High energy storage performance capacitors have received widespread attention in the fields of on-board inverter,photovoltaic power generation,and aircraft carrier ejection systems due to their ultrafast charging-discharging speed and ultrahigh power density.Enhancing the energy storage density(Ue)can accelerate the inte-gration and promote the rapid development of power electronics devices.Here,P(VDF-CTFE)is used as the matrix and linear homopolymer PMMA is used as the filler to limit the crystallization and ferroelectric phase transi-tion,and coprecipitation-hot pressing is used instead of the solution casting method to achieve the homogeneity of the structure.It shows PMMA can be uniformly distributed in P(VDF-CTFE)and limit the ferroelectric relaxation loss,the phase field simulation analysis shows that the uniformly distributed PMMA can optimize the electric field distribution,and the Ue of 10.1 J/cm 3 with the charge-discharge efficiency(η)of 74% are obtained under the e-lectric field of 372 MV/m at 20vol% filling,which provides scientific and technological support for the practicaliza-tion of high energy storage composite dielectric films.