Nanonet-/fiber-structured flexible ceramic membrane enabling dielectric energy storage  

作　　者：Lvye DOU Bingbing YANG Shun LAN Yiqian LIU Yuan-Hua LIN Ce-Wen NAN 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Journal of Advanced Ceramics》2023年第1期145-154,共10页先进陶瓷（英文）

基　　金：supported by the National Key R&D Program of China (No.2021YFB3800601);the National Natural Science Foundation of China (No.52102275);China Postdoctoral Science Foundation (Nos.2021TQ0163 and 2021M701821);the Open Youth Fund project of Foshan (South China)Institute of New Materials (No.2021AYF25011);Shuimu Tsinghua Scholar Program。

摘　　要：Ceramics are considered intrinsically brittle at macro scale due to the lack of slip mechanism and pre-existing defects,which greatly limits their potential applications in emerging fields including wearable electronic devices and flexible display.In this contribution,we developed BiFeO_(3)/SiO_(2) dual-networks with exceptional flexibility through a coupled electronetting/electrospun method.The hybrid nanostructured networks endow the material with high tensile strength(2.7 MPa),excellent flexibility(80%recoverable deformation),and robust fatigue resistance performance(maintain flexibility after a 1000-cyclic compress test).After in-situ compounded with dielectric polymer via a layer-by-layer solution casting method,the resultant three-dimensional(3D)composite film exhibits a twice higher dielectric constant(εr)than polyether imide(PEI)film.More importantly,the breakdown strength of the 3D composite film is almost the same as that of the PEI film,resulting in an enhanced energy density of~6.0 J/cm^(3) and a high efficiency of 80%at 4.58 MV/cm.The unique structure,combined with the excellent balance between mechanical and dielectric properties in flexible structures,is of critical significance to the design of flexible functional ceramics and broadening their applications in wearable electric devices.

关 键 词：BiFeO_(3)/SiO_(2)dual-network FLEXIBLE mechanically robust dielectric energy storage 

分 类 号：TQ174.7[化学工程—陶瓷工业] TM53[化学工程—硅酸盐工业]