Dielectric And Energy Storage Characteristics Of Composite Modified Ferroelectric And Polymer-based Materials

Various digital products are constantly developing towards multi-function,miniaturization and intelligence.People can not only effectively improve the basic performance of materials,but also can continuously develop many new functions,especially for various energy storage materials.Dielectric capacitors store energy in the form of electrostatic fields through polarization,have fast charge and discharge speeds,and have important application prospects in high-power pulse systems.Ferroelectric ceramic materials have important application prospects in energy storage because of their excellent dielectric properties.The polymer-based dielectric material has excellent flexibility,high voltage resistance,and strong mechanical strength.As a dielectric capacitor,it can achieve flexible application requirements.To this end,we used potassium sodium niobate,barium zirconate titanate and polyimide as the matrix for doping or composite modification,and explored and studied the phase structure and microstructure of sample materials doped with different contents.The dielectric or energy storage properties of the material.(K_0.5Na_0.5)_0.99Sm_0.01(Nb_1-x-x Sn_x)O₃ ceramic samples were prepared by high temperature solid phase method.The results show that with the increase of the doping amount of Sn ions,the dielectric loss decreases from 0.0903 to 0.0743（100 kHz）.When x=0.005,the energy storage density reaches the maximum value,about 3.2J/cm³.At the same time,proper doping of Sn ions can improve the sintering performance of KNN-based ceramics and increase the degree of densification.In Ba(Zr_0.3,Ti_0.7)O₃ ceramics with different doping amounts of NaNbO₃,through comparison,it was found that as the doping amount increases,the ceramic grains become more and more irregular,and the density decreases accordingly.When the doping amount of NaNbO₃ is 0.10mol,the density of ceramics is the best.When the doping amount of NaNbO₃ is 0.05mol,the dielectric constant is larger and the dielectric loss is the smallest.When the doping amount of NaNbO₃ is 0.1mol,the dielectric loss is the largest,which can exceed 7 at 500℃.As the amount of NaNbO₃added increases,the dielectric constant of ceramics tends to decrease first and then increase.When Ba(Zr_0.3,Ti_0.7)O₃ ceramics is doped with 0.1 mol(K_0.5,Na_0.5)NbO₃,the dielectric constant of the ceramic is the largest,and it can reach 3200 at 500℃.In Ba(Zr_0.3,Ti_0.7)O₃ ceramics with different doping amounts of NaNbO_3,when the doping amount of NaNbO₃ was 0.05mol,the dielectric constant was larger and the dielectric loss was the smallest.When the doping amount of NaNbO₃ was 0.1mol,the dielectric loss was the largest,which can exceed 7 at 500℃.As the amount of NaNbO₃ further increases,the dielectric constant of ceramics tends to decrease first and then increase,it can reach 3200 at 500℃.Polyimide/BaTiO₃ composites can be successfully prepared by incorporating dopamine-modified BaTiO₃ particles into the PAA solution and then forming a film along the flow.Moreover,the obtained composite material has higher thermal stability than pure polyimide.As the content of BaTiO₃ increases,the decomposition temperature increases.The dielectric constant changes with the change of BaTiO₃content.As the content of BaTiO₃ increases,the dielectric constant increases.For composites containing 3 wt%BaTiO₃ particles,the dielectric constant is as high as13.75,which is about 4 times the dielectric constant of pure polyimide.