Sodium niobate-based relaxor ferroelectric composite energy storage ceramic material

The invention discloses a sodium niobate-based relaxor ferroelectric composite energy storage ceramic material and a preparation method thereof, overcomes the defects of low anti-breakdown field intensity and high remanent polarization intensity of a pure sodium niobate material, and has more excellent comprehensive energy storage performance. The general formula of the ceramic material is (1-x) Na < 0.94 > Sm < 0.02 > NbO < 3-x > Bi < 0.5 > La < 0.5 > Ba < 0.67 > Ta < 0.33 > O < 3 >, x is more than or equal to 0.05 and less than or equal to 0.25, and subscript numbers represent the molar ratio of elements. Under the test frequency of 10 Hz and the environment temperature of 25 DEG C, the material has the saturation polarization intensity change range of 18.1 [mu] C/cm < 2 > < = Ps < = 35.5 [mu] C/cm < 2 >, the anti-breakdown field intensity change range of 280 kV/cm < = Eb < = 360 kV/cm, the effective energy storage density change range of 1.75 J/cm < 3 > < = Wrecc < = 2.49 J/cm < 3 >, and the energy storage