Preparation method of low-loss high-energy-density sodium bismuth titanate based ceramic

A high energy storage density, sodium bismuth titanate-based technology, applied in the field of dielectric energy storage materials, can solve the problems of low energy storage density and excessive loss, and achieve the effects of improving energy storage density and energy efficiency

Inactive Publication Date: 2016-12-07
XIDIAN UNIV +1
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing bismuth sodium titanate-based ceramics with low loss and high energy storage density, aiming to solve the problems of relatively small energy storage density and excessive loss in existing dielectric energy storage materials

Method used

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  • Preparation method of low-loss high-energy-density sodium bismuth titanate based ceramic
  • Preparation method of low-loss high-energy-density sodium bismuth titanate based ceramic
  • Preparation method of low-loss high-energy-density sodium bismuth titanate based ceramic

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preparation example Construction

[0033] Such as figure 1 As shown, the method for preparing sodium bismuth titanate-based ceramics with low loss and high energy storage density in the embodiment of the present invention includes the following steps:

[0034] S101: According to (1-x)(0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 )-xBi 0.2 Sr 0.7 TiO 3 Chemical proportioning weighing a certain amount of analytical pure Bi 2 O 3 , Na 2 CO 3 , TiO 2 , BaCO 3 And SrCO 3 ;

[0035] S102: Put the prepared materials into a ball mill tank, and mix the materials according to the ratio of zirconia ball: material: alcohol volume ratio of 3:1:1, and the milling time is 6-10 hours;

[0036] S103: Dry the ball-milled material, then press it into large pieces, and pre-fire at 800°C for 4-6 hours to obtain pre-fired powder;

[0037] S104: Put the pre-burned powder into the ball milling tank again, grind for 10-12 hours, dry and sieve;

[0038] S105: Press the sieved powder into a disc with a diameter of 12mm and a thickness of about 2mm, and fo...

Embodiment 1

[0042] Example 1, 9.3145g of Bi was weighed according to the stoichiometric ratio 2 O 3 , 1.9608g of Na 2 CO 3 , 7.987g of TiO 2 , 0.8762g of BaCO 3 And 2.6869g of SrCO 3 , Put the weighed material into the ball mill tank, and mix the material with the ratio of zirconia ball: material: alcohol volume ratio of 3:1:1, and the ball milling time is 6-10 hours; after drying the ball milled material Press large pieces and pre-fire at 800°C for 4-6 hours. Take out the calcined material, grind it and ball-mill it again for 10-12 hours, dry and sieve; pre-press the sieved powder into a diameter of 12mm, A disc with a thickness of 2mm is molded under an isostatic pressure of 250MPa; the disc is kept at 1100-1200℃ for 2-4 hours; after sintering into porcelain, it is polished and then coated with silver paste. At 550℃, Keep the temperature for 30 minutes and burn the silver electrode. From figure 2 In the X-ray diffraction pattern of the BNT-based material, it can be seen that the prepare...

Embodiment 2

[0043] Example 2, Weigh 9.1887g of Bi according to the stoichiometric ratio 2 O 3 , 1.9078g of Na 2 CO 3 , 7.987g of TiO 2 , 0.8526g of BaCO 3 And 2.8936g of SrCO 3 , Put the weighed material into the ball mill tank, and mix the material with the ratio of zirconia ball: material: alcohol volume ratio of 3:1:1, and the ball milling time is 6-10 hours; after drying the ball milled material Press large pieces and pre-fire at 800°C for 4-6 hours. Take out the calcined material, grind it and ball-mill it again for 10-12 hours, dry and sieve; pre-press the sieved powder into a diameter of 12mm, A disc with a thickness of 2mm is molded under an isostatic pressure of 250MPa; the disc is kept at 1100-1200℃ for 2-4 hours; after sintering into porcelain, it is polished and then coated with silver paste. At 550℃, Keep the temperature for 30 minutes and burn the silver electrode. From figure 2 In the X-ray diffraction pattern of the BNT-based material, it can be seen that the prepared cera...

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Abstract

The invention discloses a preparation method of low-loss high-energy-density sodium bismuth titanate based ceramic. The preparation method includes: weighing certain amounts of analytically pure Bi2O3, Na2CO3, TiO2, BaCO3 and SrCO3 according to a chemical proportion; mixing and ball-milling zirconium oxide ball, material and alcohol according to a volume ratio of 3:1:1; drying the ball-milled material, pressing the material into blocks, and pre-sintering to obtain pre-sintered powder; placing the pre-sintered powder in a ball-milling tank for milling for 10-12h, and drying before sieving; pressing sieved powder for forming; sintering a wafer at temperature of 1100-1200 DEG C; polishing the wafer sintered into ceramic, cleaning, coating silver size, and sintering at temperature of 550 DEG C to obtain a silver electrode. By optimizing ceramic formulation, energy density and energy efficiency of BNT-based ceramic are both improved. When an electric field at room temperature is 95kV / cm, the energy density of the ceramic is up to 1.22J / cm3, and energy storage efficiency is up to 91%.

Description

Technical field [0001] The invention belongs to the technical field of dielectric energy storage materials, and particularly relates to a preparation method of bismuth sodium titanate-based ceramics with low loss and high energy storage density. Background technique [0002] With the development of the modern electronics industry in the direction of miniaturization and high integration and the development and use of new energy vehicles, the development needs of high energy storage density capacitors have gradually emerged. Dielectric energy storage has the advantages of high power density, good temperature stability, and excellent fatigue resistance. Therefore, dielectric materials are one of the most promising materials for preparing high-power and high-density capacitors. However, the energy density of dielectric materials is far lower than that of ordinary battery energy storage, and high dielectric constant is often accompanied by relatively large It is difficult to meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/626C04B41/88
CPCC04B35/475C04B35/62605C04B35/62615C04B41/009C04B41/5116C04B41/88C04B2235/94C04B2235/95C04B2235/96C04B2235/442C04B41/4539C04B41/0072
Inventor 时婧田文超刘霄
Owner XIDIAN UNIV
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