Dielectric Energy Storage Properties Of Bismuth Sodium Titanate Based Ferroelectric Ceramics

With the continuous development of modern science and human living standard,advanced energy storage materials are playing an increasingly important role in the social fields such as aerospace,oil drilling and electromagnetic pulse weaponsThe key to the progress of energy storage devices lies in the breakthrough of new materials for energy storage.It is well known that energy density and power density are important parameters to measure the properties of energy storage materials.In actual production and application,the energy storage density of energy storage materials is not high,which is a technical bottleneck restricting the development of new energy.Therefore,we hope to find more high-performance new energy storage materials to promote the development of energy storage technology.In this paper,four series of Bi0.5Na0.5TiO3 based ferroelectric ceramics were prepared by traditional solid-state sintering method:(1-x)(0.80Bi0.5Na0.5TiO3-0.20Bi0.5K0.5TiO3)-xBi(Mg2/3Nb1/3)O3(abbreviated to:BNT-0.20BKT-xBMN)and(1-x)(0.80Bi0.5Na0.5TiO3-0.20Bi0.5K0.5TiO3)-xCaAl0.5Ta0.5O3(short:BNT-0.20BKT-xCAT),(1-x)(0.80Bi0.5Na0.5TiO3-0.20Bi0.5K0.5TiO3)-xSrAl0.5Ta0.5O3(short:BNT-0.20BKT-xSAT),(1-x)(0.80Bi0.5Na0.5TiO3-0.20Bi0.5K0.5TiO3WBaAl0.5Ta0.5O3(short:BNT-0.20BKT-xBAT)The ferroelectric property test shows that with the increase of substitution x,the maximum polarization strength and residual polarization strength decrease,and the coercive field also decreases,so the electric hysteresis loop orientation of the ceramic material is "thin".Through comprehensive analysis,the optimal value of energy storage properties of the four series of ceramic energy storage samples is as follows:(1)The energy storage properties of BNT-0.20BKT-xBMN reached the best when x=0.16;The electric field is 135.0 kV/cm,the Wrec is 1.75 J/cm3,and the η is 85.2%.(2)The energy storage properties of BNT-0.20BKT-xCAT reached the best when x=0.10;The electric field is 180.0 kV/cm,the Wrec is 5.28 J/cm3,and the η is 71.2%.(3)The energy storage properties of BNT-0.20BKT-xSAT reached the best when x=0.10;The electric field is 135.0 kV/cm,the Wrec is 2.41 J/cm3,and the η is 86.3%.(4)In BNT-0.20BKT-xBAT ceramic materials,the energy storage properties reached the best when x=0.10;The electric field is 210.0 kV/cm,the Wrec is 4.57 J/cm3,and the η is 84.0%.At the same time,BNT-0.20BKT-0.16BMN,BNT-0.20BKT-0.10CAT,BNT-0.20BKT-0.10SAT,BNT-0.20BKT-0.10BAT series were tested for the temperature stability of energy storage properties,and the analysis results were as follows:(1)When the sample test temperature varies from 30℃ to 180℃,the energy storage density changes less than 17.1%.Energy storage efficiency remains above 80.0%.(2)When the test temperature of BNT-0.20BKT-0.10CAT ceramic energy storage material varies from 23℃ to 120℃,the energy storage density changes less than 24.2%.Energy storage efficiency remained above 75.8%.(3)When the test temperature of BNT-0.20BKT-0.10SAT ceramic energy storage material varies from 25℃ to 90℃,the energy storage density changes less than 8.3%.Energy storage efficiency remained above 76.8%.(4)When the temperature of BNT-0.20BKT-0.10BAT ceramic energy storage material varies from 24℃ to 130℃,the change of energy storage density is less than 5.1%.Energy storage efficiency remains above 88.0%.In conclusion,ceramic materials with both high energy storage density and high energy storage efficiency were obtained by introducing the third element method on the basis of BNT-0.20BKT in this paper,which provides more alternative materials for the application of energy storage technology.