High-temperature energy storage dielectric with inhibition of carrier injection/migration based on band structure regulation  

作　　者：Guang Liu Qingquan Lei Yu Feng Changhai Zhang Tiandong Zhang Qingguo Chen Qingguo Chi 

机构地区：[1]Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education,Harbin University of Science and Technology,Harbin,People's Republic of China

出　　处：《InfoMat》2023年第2期22-33,共12页信息材料（英文）

基　　金：This research was funded by the National Natural Science Foundation of China(No.U20A20308,52177017,and 51977050);Natural Science Foundation of Heilongjiang Province of China(No.YQ2021E036 and ZD2020E009);China Postdoctoral Science Foundation(No.2020T130156);Heilongjiang Postdoctoral Financial Assistance(No.LBHZ18098);Fundamental Research Foundation for Universities of Heilongjiang Province(No.2019-KYYWF-0207 and 2018-KYYWF-1624);University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province(UNPYSCT-2020177).

摘　　要：Dielectric capacitors have a high power density,and are widely used in military and civilian life.The main problem lies in the serious deterioration of dielectric insulation performance at high temperatures.In this study,a polycarbonate(PC)-based energy storage dielectric was designed with BN/SiO_(2)heterojunctions on its surface.Based on this structural design,a synergistic suppression of the carrier injection and transport was achieved,significantly improving the insulating properties of the polymer film.In particular,the composite film achieves optimal high-temperature energy-storage properties.The composite film can withstand an electric field intensity of 760 MV m^(-1)at 100℃and obtain an energy storage density of 8.32 J cm^(-3),while achieving a breakthrough energy storage performance even at 150℃(610 MV m^(-1),5.22 J cm^(-3)).Through adjustment of the heterojunction structure,free adjustment of the insulation performance of the material can be realized;this is of great significance for the optimization of the material properties.

关 键 词：electron injection and transport HETEROJUNCTION high temperature energy storage characteristics INSULATION POLYCARBONATE 

分 类 号：TB33[一般工业技术—材料科学与工程]