二氧化钛/聚醚酰亚胺复合薄膜及其介电储能性能  

Capacitive Energy Storage Performance of Poly(ether imide)Composites with TiO_(2)Particles

作　　者：师庆宇 袁秭鄂 赵耀庭 张晓芳 林秀娟[1] 杨长红[1] SHI Qingyu;YUAN Zie;ZHAO Yaoting;ZHANG Xiaofang;LIN Xiujuan;YANG Changhong(Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials,University of Jinan,Jinan 250022,China)

机构地区：[1]济南大学,山东省建筑材料制备与测试技术重点实验室,济南250022

出　　处：《硅酸盐学报》2024年第7期2197-2205,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(U2006218,U1806221)。

摘　　要：工业应用迫切需要新一代的聚合物介电电容器能在高温高场下稳定工作并表现出优异的储能密度和效率。以发展耐高温聚合物基电介质为目标,采用聚醚酰亚胺(PEI)为基体,制备了TiO_(2)/PEI复合薄膜,并对其常温和高温下的介电储能性能进行了分析。研究结果表明,较宽带隙TiO_(2)颗粒的加入可使TiO_(2)/PEI复合薄膜在常温下的储能密度和充放电效率达到7.10 J/cm^(3)和94.9%;150℃下复合薄膜具有的最大储能密度仍维持在5.05 J/cm^(3),充放电效率仍不低于88.5%,证明了该复合薄膜具有在高温环境下稳定工作的巨大潜力。Introduction Polymer based dielectric capacitors are used in pulse power systems due to their ultrafast charge–discharge speed,mechanical flexibility,good reliability,light weight,and low cost.Although the breakdown strength of the commercial biaxially oriented polypropylene film(BOPP)capacitor is greater than 700 MV/m and the dielectric loss is less than 0.02%,its energy density is only 2–3 J/cm^(3),and its long-term service temperature does not exceed 105℃.Poly(ether imide)(PEI)as a linear polymer with excellent thermal and chemical stability has a high breakdown strength(E_b)and an extremely low loss,thus is widely used at high temperatures.Nevertheless,the discharged energy density of pristine PEI as low as 2.90 J/cm^(3)inhibits the enhanced energy storage performance.Composites composed of dielectric ceramic particle and polymer matrix have the combined advantages of a large dielectric constant of ceramic and a high breakdown strength of polymer.In this paper,titanium dioxide(TiO_(2))particles were introduced into the PEI matrix to prepare a TiO_(2)/PEI composite,and the dielectric properties were analyzed.Methods TiO_(2)particles were prepared by a sol–gel method,and TiO_(2)/PEI composites were prepared by a tape casting method.TiO_(2)particles with a target content were firstly dispersed in NMP solvent under ultrasound for 60 min to form a stable suspension,and then the PEI particles were added into the suspension in a small amount repeatedly and stirred for several hours until a uniform and stable solution was formed.Subsequently,the suspension was cast on a smooth glass plate,and the thickness of the composite was controlled by a scraper.The composites were further dried in a vacuum oven at 120℃for several hours to thoroughly remove the solvent.Finally,the electrode with the diameter of 2 mm was coated onto the film via ion sputtering before testing.Results and discussion The relative dielectric constant of the composite is improved as Ti O_(2)content is increased.When the volume fraction of Ti

关 键 词：聚醚酰亚胺薄膜 二氧化钛 储能密度 充放电效率 

分 类 号：TB332[一般工业技术—材料科学与工程]