Composites Storage Properties Of Dielectric Ceramics And Ferroelectric Polymers

With the development of electronic technology and industry, microelectronicdevice have been increasingly miniaturized and integrated. Therefore, the highdielectric materials have broad applications in microelectronic devices.In recent years CaCu3Ti4O12(CCTO) ceramics which has centrosymmetricbbc structure has caused the attention of the researchers because of its highdielectric constant, it became a kind of important practical material for potentialcapacitor applications. The material has a giant dielectric constant and low lossduring a wide temperature range. Within the scope its dielectric constant isalmost constant, that reflect its heat stability of the dielectric response. Thesegood comprehensive performance make CCTO has a potential to have a wideapplication in the field of high density energy storage, thin film devices, highdielectric capacitors, etc. It is also important to understand the formation of itsgiant dielectric properties and high thermal stability in theoretical field.The main concern of this paper is the energy storage performance of giantdielectric ceramic-ferroelectric polymer composite material under differentconcentrations. Giant dielectric ceramics used in the research is nano sizedCCTO, ferroelectric polymer is poly (vinylidene fluoride/chlorotrifluoroethylene)copolymer (PVDF-CTFE). Solution casting and spin coating process methodshave been used in film forming process to obtain composite thin films ofdifferent concentrations, then process thin films in different ways to study theenergy storage property of composites. In the program of micro sized ceramicCaCu3Ti4O12and P(VDF-CTFE)88/12copolymer composites, process methodsuch as annealing and hot press were studied. At room temperature theexperiment obtained a good performance of the composite film; Thesecomposites exhibit a high dielectric constant, the loss is almost independent oftemperature, which enabling these properties to its application. Also, thedielectric constant difference between the nano-sized and micro-sizedcomposites is much smaller than the difference in P (VDF-TrFE)55/45copolymer. Breakdown field of the composite showes, the breakdown field ofcomposite strongly depended on the concentration and process conditions. Meanwhile, the breakdown field of the composite is also closely related to thefilm thickness. Therefore, if the composite film has a smaller thickness, itexhibits a better energy storage property. In the research of the silane couplingagent effect for the composite production process, the using of coupling agentcan improve the dielectric constant of the materials. However, we did not findthe relationship between breakdown field of composite and coupling agent.