Using Defects to Create Ceramics with Giant Permittivity as Ultracapacitors

Talebinezhad, H ; Wang, W Y ; Cheng, Z-Y ; Hill, Curlis ; Tucker, D ; Rolin, T

关键词: BARIUM TITANATES;    CAPACITORS;    CERAMICS;    DEFECTS;    DIELECTRICS;    ELECTROCHEMICAL CAPACITORS;    ENERGY STORAGE;    FERROELECTRICITY;    FLUX DENSITY;    NANOPARTICLES;    PHASE TRANSFORMATIONS;    PLASMAS (PHYSICS);    P-N JUNCTIONS;    SILICON DIOXIDE;    TEMPERATURE DEPENDENCE;   

RP-ID  :  M19-7431

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Dielectrics with a high and weakly- temperature-dependent permittivity are highly desirable for the development of high performance energy storage devices. It is well known that ferroelectrics (FEs) exhibit a high permittivity that is strongly dependent on the temperature due to phase transition. In this project, the FE BaTiO3 (BTO), based ceramics are developed as ultra-capacitors by introducing defects to eliminate the phase transition and enhance the permittivity. The ceramics are fabricated using a unique process: BTO nanoparticles are coated with a nano-layer of SiO2 and, then, sintered in vacuum using SPS process. The ceramics exhibit a giant permittivity and many other unique properties.