The invention discloses a lead-free
ceramic material with
high energy storage density and
energy storage efficiency and a preparation method thereof. The preparation method comprises the following steps of mixing materials according to a
chemical formula (1-x)SrTiO3-x(0.93Bi0.5Na0.5TiO3-0.07Ba0.94La0.04Zr0.02Ti0.98O3), uniformly mixing, so as to obtain raw-material
powder, uniformly mixing an
organic solvent and an emulsifier, then adding the raw-material
powder, a binder, a dispersant and a
plasticizer, then uniformly mixing, carrying out tape casing, and then
cutting, superposing, pressurizing, discharging glue and
sintering, so that a
strontium titanate based lead-free high-pressure-resistant
ceramic energy storage material is obtained. The
ceramic material provided by the invention is simple in preparation process, mature in technique, suitable for industrialized production and excellent in
energy storage property, and has the energy storage density of 1.80J / cm<3> to 2.83J / cm<3>, the
energy storage efficiency of 74 to 87 percent and the
electric field intensity of 175kV / cm to 326kV / cm, which are calculated based on an electric
hysteresis loop.