Research On Dielectric Energy Storage And Capacitor Design Of Lead-based Antiferroelectric Composite

Technology is changing rapidly,and many electronic products have become more functional and smaller in size.Capacitors,as commonly used electronic components in circuits,occupy a very large volume.It has great market application prospects and has become a hot spot for many people's research.There are many kinds of dielectric energy storage materials,but each has its own advantages and disadvantages.Such as,The breakdown field strength of ceramic materials is too low and the energy storage is extremely small,which is not conducive to market applications.Polymer materials have low energy storage density,which cannot meet the application requirements of the large energy storage market.After research,the composite of ceramic materials and polymer materials can get the dielectric properties that complement each other,which can not only improve the original low dielectric constant,but also improve the energy storage density.This article mainly conducts dielectric energy storage research and capacitor design on lead-based antiferroelectric ceramic particles PLZST.After experimental and analysis,the following results are obtained:(1)The effect of PLZST ceramic particles treated with different surface modifiers on composite materials was studied.DA,KH580 and Ti were used to modify the surface of PLZST ceramic particles.Performance test shows that DA as a surface modifier can provide a performance boost of composite materials.The breakdown strength of PVDF/DPLZST composite material reaches 434 MV/m,which is 19.6%higher than PVDF.Ue is achieve 9.22 J/cm³.and the efficiency is 61.29%.The effect of the different content of antiferroelectric ceramic particles PLZST on the composite material is also studied.From the realization results,it can be concluded that as the content of antiferroelectric ceramic particles PLZST increases,the dielectric constant will add.The 4%PVDF/DPLZST will get maximum energy.(2)The stability of PVDF/DPLZST large membrane and PVDF/DBT large membrane is also studied.The dielectric performance and energy storage performance are tested by using test electrodes with different electrode areas.As the electrode area increases,the dielectric constant,energy storage and efficiency decrease slightly.Use test electrodes with the same electrode area to test the dielectric and energy properties of the same large film at different positions,and it can be seen that the large film has better uniformity.the PVDF/DPLZST large film at 200MV/m engery are basically maintained at 3.6 J/cm³ and the efficient is 68%,and the dielectric constant at 1k Hz is about 17.8.PVDF/DBT at 200MV/m engery are basically maintained at 3.63 J/cm³.the efficient is 68.19%.at 1k Hz the dielectric constant is 18.8.(3)A 10-layer laminated capacitor was also prepared using PVDF/DPLZST composite material,and the dielectric performance of the laminated capacitor was tested.Its capacitance value at 1k Hz reached 1.152×10^-8F,which was compared with the single-layer PVDF/DPLZST composite The materials have been greatly improved.