BNNS插层PVDF/BaTiO_(3)制备高储能密度复合电介质

Preparation of high energy storage density composite dielectrics by BNNS intercalation of PVDF/BaTiO_(3)

具有快速储存与释放电能的静电电容器一直在船载逆变器、舰载飞机弹射装置、光伏/风力发电等能源领域行业有着重要的作用,提升电容器电介质材料的储能密度(Ue)可大幅加快该行业的发展。以聚偏氟乙烯(PVDF)为基体,引入钛酸钡(BaTiO_(3))陶瓷提升基体介电常数(ε_(r)),为了缓解引入高ε_(r)陶瓷造成复合材料击穿场强(E_(b))下降,通过氮化硼纳米片(BNNS)插层PVDF/BaTiO_(3)以制备三元复合材料。试验与仿真模拟发现,高绝缘BNNS能够实现复合材料E_(b)与ε_(r)的同步提升,在396 MV/m电场下获得9.7 J/cm^(3)的Ue,为缓解E_(b)与ε_(r)的矛盾与制备高储能密度电介质材料提供基础。

Electrostatic capacitors with fast storage and release of electrical energy have been playing an impor-tant role in energy field industries such as shipboard inverters,naval aircraft ejection devices,and photovoltaic/wind power generation,enhancing the energy storage density(Ue)of capacitor dielectrics can significantly acceler-ate the development of this industry.Here,polyvinylidene fluoride(PVDF)was used as the matrix and barium ti-tanate(BaTiO_(3))ceramics were introduced to enhance the dielectric constant(ε_(r))of the matrix.To mitigate the de-crease in breakdown strength(E_(b))of the composites due to the introduction of high-ε_(r) ceramics,boron nitride nanosheets(BNNS)were intercalated with PVDF/BaTiO_(3) to prepare ternary composites.Experiments and simula-tions reveal that the highly insulating BNNS can achieve the simultaneous enhancement of E_(b) andε_(r) of the compos-ites and obtain a Ue of 9.7 J/cm^(3) at 396 MV/m electric field,which provides a basis for alleviating the contradic-tion between E_(b) andε_(r) and preparing high energy storage density dielectrics.