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CN-121974683-A - Sodium bismuth titanate-barium titanate-based energy storage ceramic material and preparation method thereof

CN121974683ACN 121974683 ACN121974683 ACN 121974683ACN-121974683-A

Abstract

The invention provides a sodium bismuth titanate-barium titanate-based energy storage ceramic material and a preparation method thereof, and relates to the field of dielectric energy storage ceramic materials. The chemical formula of the ceramic material is 0.6(Bi 0.5 Na 0.5 )TiO 3 -(0.4-x)BaTiO 3 -xBi(Mg 2/ 3 Nb 1/3 )O 3, , wherein x is 0.08-0.12. The preparation method comprises the steps of weighing Bi 2 O 3 、Na 2 CO 3 、BaCO 3 、TiO 2 、MgO、Nb 2 O 5 according to stoichiometric ratio, mixing with ethanol, performing ball milling, drying, grinding and calcining to obtain a first-stage product, adding ethanol into the first-stage product, performing secondary ball milling, drying to obtain a second-stage product, dripping a binder into the second-stage product, granulating, sieving, tabletting and sintering to obtain a ceramic sheet, performing ion sputtering on the surface of the ceramic sheet, and polishing the edge of the ceramic sheet to obtain the bismuth sodium titanate-barium titanate-based energy storage ceramic material. The ceramic material disclosed by the invention has both energy storage performance and excellent temperature stability, and solves the problem that the energy storage ceramic material in the prior art is difficult to obtain the excellent energy storage performance and the excellent temperature stability.

Inventors

  • LI HAO
  • WANG PENG
  • CHEN JUN

Assignees

  • 海南大学

Dates

Publication Date
20260505
Application Date
20260204

Claims (8)

  1. 1. The bismuth sodium titanate-barium titanate-based energy storage ceramic material is characterized in that the chemical formula of the ceramic material is 0.6 (Bi 0.5 Na 0.5 )TiO 3 -(0.4-x)BaTiO 3 -xBi(Mg 2/3 Nb 1/3 )O 3, , wherein x is 0.08-0.12.
  2. 2. The sodium bismuth titanate-barium titanate based energy storage ceramic material of claim 1, wherein x is 0.1.
  3. 3. A method for preparing the sodium bismuth titanate-barium titanate-based energy storage ceramic material as claimed in any one of claims 1 or 2, comprising the steps of: S1, weighing Bi 2 O 3 、Na 2 CO 3 、BaCO 3 、TiO 2 、MgO、Nb 2 O 5 according to a stoichiometric ratio in Bi 0.5 Na 0.5 )TiO 3 -(0.4-x)BaTiO 3 -xBi(Mg 2/3 Nb 1/3 )O 3 , mixing with ethanol, performing ball milling, and then drying, grinding and calcining to obtain a first-stage product; s2, adding ethanol into the primary product, performing secondary ball milling, and drying to obtain a secondary product; s3, dripping a binder into the secondary product for granulating, and then sieving, tabletting and sintering to obtain a ceramic sheet; and S4, performing ion sputtering on the surface of the ceramic piece, and polishing the edge of the ceramic piece to obtain the sodium bismuth titanate-barium titanate-based energy storage ceramic material.
  4. 4. The method according to claim 3, wherein in the step S1, the ball milling time is 12 to 24 hours, and the calcination condition is that the calcination is carried out at 800 to 900 ℃ for 1 to 3 hours.
  5. 5. The method according to claim 3, wherein in the step S2, the secondary ball milling time is 12 to 24 hours.
  6. 6. A method according to claim 3, wherein in step S3, the binder is PVA or PVB, and the mass ratio of the binder to the secondary product is 1:5-15.
  7. 7. The method according to claim 6, wherein the sintering condition is 1100-1150 ℃ for 1-3 hours.
  8. 8. The method of claim 7, wherein the conditions for ion sputtering comprise gold target, current of 10 mA, and time of 150-300 s.

Description

Sodium bismuth titanate-barium titanate-based energy storage ceramic material and preparation method thereof Technical Field The invention relates to the field of dielectric energy storage ceramic materials, in particular to a sodium bismuth titanate-barium titanate-based energy storage ceramic material and a preparation method thereof. Background The energy problem is a pulse of technological development, along with the excessive development of fossil energy, the demand of people for green new energy is urgent to be solved, and various means such as wind power generation, hydroelectric power generation and the like are developed, but the storage of energy is key, and in various energy storage materials and equipment, a dielectric capacitor has the advantages of high power density, high charge and discharge rate, long service life, good environmental stability and the like, so that the dielectric capacitor becomes a basic stone of the modern electronic industry, and the stable operation and microminiaturization development of almost all electronic equipment from consumer electronics to power systems and from signal transmission to energy management are fundamentally supported by realizing key functions such as energy storage, filtering, coupling and decoupling in a circuit. In the kinetic energy recovery device of an electric car, the battery is difficult to withstand 80-100 ℃, and the dielectric capacitor is resistant to high temperature to a certain extent, so that the development of the dielectric capacitor with high energy storage density and high temperature resistance is of great significance. The energy storage density and energy conversion efficiency of the energy storage ceramic capacitor are affected by the polarization strength and breakdown field strength. In the existing system, the sodium bismuth titanate has high spontaneous polarization intensity, which becomes one of choices for developing high energy storage density, but has high residual polarization intensity and low breakdown field intensity, thus restricting the application range. In view of this, the remnant polarization can be reduced by doping other components to become a relaxed ferroelectric, and the breakdown field strength can be increased by means of grain refinement, breaking of long range order, and the like. Chinese patent CN118184348a discloses a barium titanate-based ceramic material having both high energy storage density and high energy storage efficiency, and a preparation method and use thereof, and the disclosed barium titanate-based ceramic material has both high energy storage density and high energy storage efficiency, but is difficult to have temperature stability. Disclosure of Invention The invention aims to provide a sodium bismuth titanate-barium titanate-based energy storage ceramic material and a preparation method thereof, which can solve the problem that the energy storage ceramic material in the prior art is difficult to obtain excellent energy storage performance and temperature stability at the same time. The invention solves the technical problems by adopting the following technical scheme. In one aspect, the embodiment of the application provides a sodium bismuth titanate-barium titanate-based energy storage ceramic material, wherein the chemical formula of the ceramic material is 0.6 (Bi 0.5Na0.5)TiO3-(0.4-x)BaTiO3-xBi(Mg2/3Nb1/3)O3,, wherein x is 0.08-0.12. Further, x is 0.1. On the other hand, the embodiment of the application also provides a preparation method of the sodium bismuth titanate-barium titanate-based energy storage ceramic material, which comprises the following steps: S1, weighing powder with the purity of more than or equal to 99.9% of all Bi 2O3、Na2CO3、BaCO3、TiO2、MgO、Nb2O5（ according to the stoichiometric ratio in Bi 0.5Na0.5)TiO3-(0.4-x)BaTiO3-xBi(Mg2/3Nb1/3)O3, mixing with ethanol, performing ball milling, and then drying, grinding and calcining to obtain a first-stage product; s2, adding ethanol into the first-stage product, performing secondary ball milling, and drying to obtain a second-stage product; s3, dripping a binder into the secondary product for granulation, and then sieving, tabletting and sintering to obtain a ceramic sheet; and S4, performing ion sputtering on the surface of the ceramic piece, and polishing the edge of the ceramic piece to obtain the sodium bismuth titanate-barium titanate-based energy storage ceramic material. Further, in the step S1, the ball milling time is 12-24 hours, and the calcining condition is that the calcination is carried out for 1-3 hours at 800-900 ℃. Further, in the step S2, the secondary ball milling time is 12-24 hours. Further, in step S3, the binder is PVA or PVB, and the mass ratio of the binder to the secondary product is 1:5-15. Further, the sintering condition is that the sintering is carried out for 1-3 hours at 1100-1150 ℃. Further, the ion sputtering conditions comprise that a gold target is selected as a target material, a