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High-temperature-stability sodium bismuth titanate-based dielectric energy storage ceramic material and preparation method thereof

A bismuth sodium titanate-based, ceramic material technology, applied in the direction of fixed capacitor dielectrics, fixed capacitors, fixed capacitor parts, etc., to achieve excellent performance, strong energy storage capacity, and the effect of weakening ferroelectricity

Active Publication Date: 2022-05-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is a lack of publications on bismuth sodium titanate-based ceramics with excellent energy storage performance and thermal stability at room temperature

Method used

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  • High-temperature-stability sodium bismuth titanate-based dielectric energy storage ceramic material and preparation method thereof
  • High-temperature-stability sodium bismuth titanate-based dielectric energy storage ceramic material and preparation method thereof

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preparation example Construction

[0022] The preparation method of described ceramic material comprises the following steps:

[0023] Step 1: Select from Na with a purity greater than 98% 2 CO 3 、 Bi 2 o 3 、BaCO 3 , SrCO3 、TiO 2 , ZnO, Ta 2 o 5 Powder, according to the general chemical formula Na 0.5 Bi 0.5 TiO 3 -xBaTiO 3 -ySrTiO 3 -zZnTa 2 o 6 , 0≤x≤0.1, 0.2≤y≤0.5, 0≤z≤0.2 ingredients;

[0024] Step 2: Put the powder prepared in step 1 into a nylon ball mill tank, use zirconium balls and absolute ethanol as the ball milling medium, and according to the mass ratio of mixture: grinding ball: absolute ethanol is 1: (4 ~ 8): The ratio of (1~3) is ball milled for 3~10 hours to obtain a uniformly mixed ceramic powder, and then dried at a temperature of 60~120°C, sieved through a sieve of 80~120 mesh, and calcined at a temperature of 700~1000°C for 2~ 6h, to obtain the calcined material;

[0025] Step 3: The calcined material obtained in step 2 is ball-milled for 3-10 hours with the mass ratio of ca...

Embodiment 1

[0028] Weigh 3.5012g of Na 2 CO 3 , 15.6220g Bi 2 o 3 , 0g of BaCO 3 , 13.8642g of SrCO 3 , 18.0018g of TiO 2 , 0.7643g of ZnO and 4.1499g of Ta 2 o 5 , to get a mixture;

[0029] Use zirconia balls as the ball milling medium for the obtained mixture, and perform ball milling according to the mass ratio of mixture: ball: absolute ethanol of 1:5:2 to obtain a uniformly mixed ceramic powder, and then dry it at 70°C After sieving through a 100-mesh sieve, calcining at 900°C for 4 hours to obtain pre-fired material;

[0030] After the obtained calcined material is crushed, zirconia balls are used as the ball milling medium, and the mass ratio of mixture: balls: absolute ethanol is 1:5:2 for ball milling for 6 hours, and then dried at 70°C , using polyvinyl alcohol solution with a concentration of 2%-10% as a binder to granulate, and press molding under a pressure of 10MPa for 10s to obtain a green body;

[0031] The obtained green body was sintered at a temperature of 12...

Embodiment 2

[0033] Weigh 3.3891g of Na 2 CO 3 , 15.1219g Bi 2 o 3 , 0g of BaCO 3 , 13.6644g of SrCO 3 , 17.5575g of TiO 2 , 0.9415g of ZnO and 5.1126g of Ta 2 o 5 , to get a mixture;

[0034] Use zirconia balls as the ball milling medium for the obtained mixture, and perform ball milling according to the mass ratio of mixture: ball: absolute ethanol of 1:5:2 to obtain a uniformly mixed ceramic powder, and then dry it at 70°C After sieving through a 100-mesh sieve, calcining at 900°C for 4 hours to obtain pre-fired material;

[0035] After the obtained calcined material is crushed, zirconia balls are used as the ball milling medium, and the mass ratio of mixture: balls: absolute ethanol is 1:5:2 for ball milling for 6 hours, and then dried at 70°C , using polyvinyl alcohol solution with a concentration of 2%-10% as a binder to granulate, and press molding under a pressure of 10MPa for 10s to obtain a green body;

[0036] The obtained green body was sintered at a temperature of 12...

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Abstract

The invention discloses a high-temperature-stability sodium bismuth titanate-based dielectric energy storage ceramic material, and belongs to the technical field of electronic information functional materials and devices. The ceramic material is Na0. 5Bi0. 5TiO3-xBaTiO3-ySrTiO3-zZnTa2O6, x is greater than or equal to 0 and less than or equal to 0.1, y is greater than or equal to 0.2 and less than or equal to 0.5, and z is greater than or equal to 0 and The dielectric ceramic material disclosed by the invention not only realizes high energy storage density, energy storage efficiency and power density, but also realizes temperature stability which does not exist in other sodium bismuth titanate-based energy storage ceramics and meets the X7R standard at room temperature.

Description

technical field [0001] The invention belongs to the technical field of electronic information functional materials and devices, and in particular relates to a bismuth sodium titanate-based dielectric energy storage ceramic material. Background technique [0002] Driven by technological and industrial upgrading, pulse power supply technology has been widely used in modern power systems. Compared with supercapacitors and electrochemical capacitors, dielectric capacitors have higher power density, charge-discharge speed, and cycle life, which are crucial for pulse capacitors. At the same time, facing the development trend of modern power system integration and miniaturization, the relatively small energy storage density of dielectric capacitors limits its application. Therefore, the development of dielectric energy storage ceramic materials with high energy storage density and power density has great application value. [0003] Sodium bismuth titanate ceramics with high intri...

Claims

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Application Information

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IPC IPC(8): H01G4/12C04B35/475C04B35/622
CPCH01G4/1227H01G4/1218H01G4/1209C04B35/475C04B35/622C04B2235/3201C04B2235/3234C04B2235/3236C04B2235/3248C04B2235/3284C04B2235/96Y02E60/13
Inventor 袁颖蒋泽华唐斌钟朝位张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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