Research On The Preparation And Properties Of Perovskite Titanate Lead-Free Energy Storage Ceramics

Recently,energy storage components have been developing towards lead-free,miniaturization,large energy storage density and high energy storage efficiency.Ceramic dielectric materials have received more and more attention to advanced pulse power electronic technology due to their high dielectric constant,good thermal stability and outstanding mechanical properties.Most of the ceramic dielectric materials in current applications contain lead,which is harmful to the environment and the human body.However,lead-free ceramic dielectric materials limit their wider application due to their relatively low energy storage density and energy storage efficiency.Therefore,the purpose of this study is to enhance the synergistic effect of breakdown field strength and polarization properties to improve the energy storage properties of Bi_0.5Na_0.5TiO₃and BaTiO₃ based ceramics.Finally,this paper systematically analyzes and studies the relevant properties of these materials.The?1-x?(0.95Bi_0.5Na_0.5TiO₃-0.05Ba(Al_0.5Nb_0.5)O₃)-x MgO-Al₂O₃-SiO₂?denoted as?1-x??0.95BNT-0.05BAN?-xMAS?energy storage ceramics were fabricated via traditional solid-state sintering method and tape-casting method.The results reveal that the?1-x??0.95BNT-0.05BAN?-xMAS energy storage ceramics possess a perovskite structure.As the increase of the amount of MAS glass,both of their dielectric constant and dielectric loss gradually decrease,and the temperature of maximum dielectric constant?T_m?gradually shifts towards high temperature.The?1-x??0.95BNT-0.05BAN?-xMAS energy storage ceramics exhibit outstanding energy storage performance with x=0.04.Meanwhile,the charge energy storage density?W?is 3.90 J/cm³,and the discharge energy storage density(W_rec)is 1.22 J/cm³.The?SrTiO₃+0.5wt% Li₂CO₃?/[?1-x?Bi_0.5Na_0.5TiO₃-xBa(Al_0.5Nb_0.5)O₃]?denoted as STL/[?1-x?BNT-xBAN]?multilayer energy storage ceramics were fabricated via traditional solid-state sintering method and tape-casting method.The results reveal that the STL/[?1-x?BNT-xBAN]multilayer energy storage ceramics possess a pure perovskite structure.As the increase of the value of x,both of their dielectric constant and dielectric loss show a tendency of increase first and then decrease.Meanwhile,the T_m gradually shifts towards low temperature direction.The STL/[?1-x?BNT-xBAN]multilayer energy storage ceramics exhibit outstanding energy storage performance with x=0.15.As follows,W=2.32 J/cm³,and W_rec=1.63 J/cm³.Energy storage loss(W_loss)is 0.69J/cm³,and energy storage efficiency???is 70%.The?1-x?BaTiO₃-xK_0.73Bi_0.09NbO₃?denoted as?1-x?BT-xKBN?energy storage ceramics were fabricated via traditional solid-state sintering method and cold isostatic pressing method.The results reveal that BT and KBN form a perovskite solid solution.As the increase of the value of x,the dielectric constant and dielectric loss of the?1-x?BT-xKBN energy storage ceramics increase first and then decrease,and the T_m gradually shifts towards low temperature.The?1-x?BT-xKBN energy storage ceramics exhibit outstanding energy storage performance(W=2.89 J/cm³,W_rec=2.51 J/cm³,W_loss=0.38 J/cm³,?=87%)with x=0.08 as well as the maximum breakdown field strength reach 327 kV/cm,In addition,the?1-x?BT-xKBN energy storage ceramics have excellent temperature stability and frequency stability in wide temperature and frequency range.TheBi_0.5-xLa_x(Na_0.82K_0.18)_0.5(Al_0.5Nb_0.5)_0.08Ti_0.9Zr_0.02O₃?denotedas BNKTANZ-xL?energy storage ceramics were fabricated via traditional solid-state sintering method and cold isostatic pressing method.The results reveal that the BNKTANZ-xL energy storage ceramics possess a pure perovskite structure.As the increase of the value of x,the dielectric constant and dielectric loss of the BNKTANZ-xL energy storage ceramics decrease gradually,and the T_m gradually shifts towards low temperature.Their W_rec values are greater than 3J/cm³ with x=0.04 and x=0.06.The maximum breakdown field strength of the energy storage ceramics are 214 kV/cm with x=0.04.Meanwhile,a relatively high W?W=4.49 J/cm³?and W_rec(W_rec=3.16 J/cm³)can be obtained.At the breakdown field strength of 200 kV/cm with x=0.06,W and W_rec can reach 3.95J/cm³ and 3.24 J/cm³,respectively.The value of?is 82%.In addition,the BNKTANZ-xL energy storage ceramics have excellent temperature stability and frequency stability in wide temperature and frequency range.