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Barium titanate-based relaxor ferroelectric ceramic material with high energy storage density, high power density and high efficiency and preparation method of barium titanate-based relaxor ferroelectric ceramic material

A technology with high power density and high energy storage density, applied in circuits, capacitors, electrical components, etc., can solve the problems of high energy storage density, high power density energy storage materials, poor temperature stability of barium titanate ceramics, breakdown Low field strength and other issues, to achieve the effect of being suitable for large-scale production, promoting related applications, and low cost

Active Publication Date: 2022-06-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as an energy storage material, barium titanate ceramics have disadvantages such as poor temperature stability, low breakdown field strength, and low energy storage efficiency, which limit its application in energy storage materials.
In view of this, at this stage, barium titanate-based relaxor ferroelectrics are mainly synthesized by means of doping modification, coating modification, etc., but so far no combination of high energy storage density, high power density and high efficiency has been found. energy storage materials

Method used

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  • Barium titanate-based relaxor ferroelectric ceramic material with high energy storage density, high power density and high efficiency and preparation method of barium titanate-based relaxor ferroelectric ceramic material
  • Barium titanate-based relaxor ferroelectric ceramic material with high energy storage density, high power density and high efficiency and preparation method of barium titanate-based relaxor ferroelectric ceramic material
  • Barium titanate-based relaxor ferroelectric ceramic material with high energy storage density, high power density and high efficiency and preparation method of barium titanate-based relaxor ferroelectric ceramic material

Examples

Experimental program
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Embodiment 1

[0030] Using the present invention to prepare Bi 0.12 Ba 0.82 TiO 3 . Weigh 1.8638 g Bi according to the chemical dose ratio 2 O 3 , 10.7877 g BaCO 3 , 5.3244 g TiO 2 And poured into the ball mill, adding ethanol ball mill 24h. The ball-milled samples were dried and ground in turn, and then placed in a muffle furnace for calcination at a temperature of 850 °C for 2 h. After cooling, pour the sample into a mortar, add dropwise an appropriate amount of PVA binder (the amount of binder and the sample mass ratio is 1:10) and grind for 1 hour, grind evenly, pour into the mortar In the mold, pressed into tablets, and then placed in a muffle furnace with a temperature of 1160 °C for 2 hours of sintering. After cooling, the thickness of the ceramic sheet was ground to 0.4 mm, and the upper and lower surfaces were brushed with silver paste, and then calcined at 550 °C for 1 h. After cooling, a barium titanate-based relaxor ferroelectric ceramic material having both high energ...

Embodiment 2

[0035] Using this invention to prepare Bi 0.14 Ba 0.79 TiO 3 . Weigh 2.1745 g Bi according to the chemical dose ratio 2 O 3 , 10.3931 g BaCO 3 , 5.3244 g TiO 2 And poured into the ball mill, adding ethanol ball mill 24h. The ball-milled samples were dried and ground in turn, and then placed in a muffle furnace for calcination at a temperature of 850 °C for 2 h. After cooling, pour the sample into a mortar, add dropwise an appropriate amount of PVA binder (the ratio of the amount of binder to the sample is the same as in Example 1) and grind evenly (the grinding time is the same as in Example 1), pour it into the mortar. In the mold, pressed into tablets, and then placed in a muffle furnace with a temperature of 1140 °C for sintering for 2 h. After cooling, the thickness of the ceramic sheet was ground to 0.4 mm, and silver paste was brushed on the upper and lower surfaces of the ceramic sheet, and then calcined at 550 °C for 1 h. After cooling, a barium titanate-base...

Embodiment 3

[0038] Using this invention to prepare Bi 0.16 Ba 0.76 TiO 3 . Weigh 2.4851 g Bi according to the chemical dose ratio 2 O 3 , 9.9984 g BaCO 3 , 5.3244 g TiO2 And poured into the ball mill, adding ethanol ball mill 24h. The ball-milled samples were dried and ground in turn, and then placed in a muffle furnace for calcination at a temperature of 850 °C for 2 h. After cooling, pour the sample into a mortar, add dropwise an appropriate amount of PVA binder (the ratio of the amount of binder to the sample is the same as in Example 1) and grind evenly (the grinding time is the same as in Example 1), pour it into the mortar. In the mold, pressed into tablets, and then placed in a muffle furnace with a temperature of 1120 °C for 2 hours of sintering. After cooling, the thickness of the ceramic sheet was polished to 0.4 mm, and the upper and lower surfaces were brushed with silver paste, and then calcined at 550 °C for 1 h. After cooling, a barium titanate-based relaxor ferroe...

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Abstract

The invention provides a barium titanate-based relaxor ferroelectric ceramic material with high energy storage density, high power density and high efficiency and a preparation method of the barium titanate-based relaxor ferroelectric ceramic material, and belongs to the technical field of dielectric energy storage ceramic materials. The chemical composition of the material is BixBa1-3x / 2TiO3 (x is more than or equal to 0.08 and less than or equal to 0.18). The method comprises the following steps: introducing Bi < 3 + > to the A site of BaTiO3, and then synthesizing by adopting a solid-phase reaction method. The energy storage density of the prepared barium titanate-based relaxor ferroelectric ceramic material can reach 6.48 J / cm < 3 >, the energy storage efficiency can be stabilized at 92% or above, and the energy storage efficiency can reach 94.6% under the electric field of 480 kV / cm. In addition, the preparation method is simple, low in cost and environment-friendly, and can be used for large-scale production.

Description

technical field [0001] The invention relates to the field of dielectric energy storage ceramic materials, in particular to a barium titanate-based relaxor ferroelectric ceramic material with high energy storage density, high power density and high efficiency and a preparation method thereof. Background technique [0002] In recent years, energy storage ceramic capacitors have been widely used in pulsed power electronic systems such as communication, medical, and military due to their advantages of high electric field resistance and high power density. At present, the most widely used energy storage ceramic capacitors are lead-based capacitors, but with the requirements of environmental protection and the advancement of sustainable development strategies, the development of lead-free ceramic capacitors has gradually become an inevitable trend. Compared with lead-based energy storage ceramics, the biggest problem restricting the development of lead-free energy storage ceramics...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622H01G4/12
CPCC04B35/468C04B35/622H01G4/1227C04B2235/3298C04B2235/661
Inventor 刘辉孙正罗华杰陈骏
Owner UNIV OF SCI & TECH BEIJING
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