A kind of high energy storage density dielectric ceramic material and preparation method thereof

A technology of high energy storage density and dielectric ceramics, applied in the direction of ceramics, inorganic insulators, etc., can solve the problems of unfavorable device stability, large temperature changes, high energy storage density, etc., to reduce dependence, low capacitance temperature coefficient, improve Effect of Dielectric Strength

Active Publication Date: 2019-02-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Ba 1-x Sr x TiO 3 The dielectric strength of ceramics is generally lower than 8kV / mm, which is not conducive to obtaining higher energy storage density
In addition, the single component Ba 1-x Sr x TiO 3 The dielectric constant of ceramics changes greatly with temperature, which is not conducive to the stability of device operation

Method used

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  • A kind of high energy storage density dielectric ceramic material and preparation method thereof
  • A kind of high energy storage density dielectric ceramic material and preparation method thereof
  • A kind of high energy storage density dielectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing a high energy storage density dielectric ceramic material, the specific steps are:

[0039] (1) Ba 1-x Sr x TiO 3 (x=0.1-0.5) Synthesis of Ceramic Powder

[0040] According to Ba 1-x Sr x TiO 3 (x=0.1, 0.2, 0.3, 0.4, 0.5) weigh BaCO 3 , SrCO 3 and TiO 2 Powder, the weighed powder is ball milled in deionized water for 24 hours, wherein the ball milling medium is zirconia balls, the ball / material mass ratio is 2:1, the tank volume is 1 / 2 of the tank volume, and the ball milling speed is 250 rpm minutes; the mixed slurry after ball milling was dried and pre-fired in an alumina crucible at 1150°C for 2 hours to obtain Ba 0.9 Sr 0.1 TiO 3 、Ba 0.8 Sr 0.2 TiO 3 、Ba 0.7 Sr 0.3 TiO 3 、Ba 0.6 Sr 0.4 TiO 3 and Ba 0.5 Sr 0.5 TiO 3 These 5 single-phase powders;

[0041] (2) Preparation of MAS glass powder

[0042] According to 15% MgO, 35% Al 2 o 3 , 50% SiO 2 The mass ratio of MgO, Al 2 o 3 and SiO 2 , the weighed powder was ba...

Embodiment 2

[0049] A method for preparing a high energy storage density dielectric ceramic material, the specific steps are:

[0050] (1) Ba 1-x Sr x TiO 3 (x=0.1-0.5) Synthesis of Ceramic Powder

[0051] According to Ba 1-x Sr x TiO 3 (x=0.1, 0.2, 0.3, 0.4, 0.5) weigh BaCO 3 , SrCO 3 and TiO 2 Powder, the weighed powder is ball milled in alcohol for 24 hours, wherein the ball milling medium is corundum balls, the ball to material mass ratio is 1:1, the tank volume is 1 / 2 of the tank volume, and the ball milling speed is 250 rpm; ball milling The final mixed slurry was dried and pre-fired in an alumina crucible at 1150°C for 2 hours to obtain Ba 0.9 Sr 0.1 TiO 3 、Ba 0.8 Sr 0.2 TiO 3 、Ba 0.7 Sr 0.3 TiO 3 、Ba 0.6 Sr 0.4 TiO 3 and Ba 0.5 Sr 0.5 TiO 3 These 5 single-phase powders;

[0052] (2) Preparation of MAS glass powder

[0053] According to 13wt% MgO, 32wt% Al 2 o 3 , 55wt% SiO 2 The ratio of weighing MgO, Al 2 o 3 and SiO 2 , the weighed powder was ball ...

Embodiment 3

[0060] A method for preparing a high energy storage density dielectric ceramic material, the specific steps are:

[0061] (1) Ba 1-x Sr x TiO 3 (x=0.1-0.5) Synthesis of ceramic powder

[0062] According to Ba 1-x Sr x TiO 3(x=0.1, 0.2, 0.3, 0.4, 0.5) weigh BaCO 3 , SrCO 3 and TiO 2 Powder, the weighed powder is ball milled in alcohol for 24 hours, wherein the ball milling medium is agate balls, the mass ratio of balls to material is 3:1, the filling capacity is 1 / 2 of the tank volume, and the ball milling speed is 250 rpm; ball milling The final mixed slurry was dried and pre-fired in an alumina crucible at 1150°C for 2 hours to obtain Ba 0.9 Sr 0.1 TiO 3 、Ba 0.8 Sr 0.2 TiO 3 、Ba 0.7 Sr 0.3 TiO 3 、Ba 0.6 Sr 0.4 TiO 3 and Ba 0.5 Sr 0.5 TiO 3 These 5 single-phase powders;

[0063] (2) Preparation of MAS glass powder

[0064] According to 18wt% MgO, 25wt% Al 2 o 3 , 57wt% SiO 2 The ratio of weighing MgO, Al 2 o 3 , SiO 2 , the weighed powder was bal...

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Abstract

The invention discloses a dielectric ceramic material with a high energy storage density and a preparation method thereof. The ceramic material is prepared by compounding BST ceramic mixed powder and MAS glass powder. The using amount of MAS glass powder accounts for 0.2 to 10% of the weight of the BST ceramic mixed powder. The MAS glass powder is composed of MgO-Al2O3-SiO2. The BST ceramic mixed powder is prepared by mixing and ball-grinding a plurality of powder represented by the formula: Ba<1-x>Sr<x>TiO3, wherein x is in a range of 0.1 to 0.5. Compared with the prior art, the prepared energy storage dielectric ceramic has the advantages of high dielectric constant (>1600), low dielectric loss (<0.02), high breakdown electric field strength (>18.0 kV / mm), and high energy storage density (>2.50 J / cm3), in the temperature range of 55 to 125 DEG C, the dielectric constant change rate is in a range of -13.0% to 5.0%; and thus the ceramic material has a wide application range in the pulse power energy storage system.

Description

technical field [0001] The invention belongs to the field of dielectric energy storage materials, and in particular relates to a high energy storage density dielectric ceramic material and a preparation method thereof. technical background [0002] In recent years, in the field of electronics industry, devices with high energy storage density have attracted more and more attention, and it is imminent to study new high energy storage devices. Compared with traditional energy storage devices, dielectric capacitors use polarized charges to store electrical energy, and their charge and discharge rates and discharge power densities are several orders of magnitude higher than traditional energy storage devices. In addition, it has better stability. In the field of pulse power technology, there is a great demand for hybrid electric vehicles, and it has a high application prospect. However, the energy storage density of current dielectric energy storage capacitors is far from meeti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C12/00H01B3/12C04B35/468C04B35/622
CPCC03C12/00C04B35/468C04B35/622C04B2235/3213C04B2235/3232C04B2235/36C04B2235/96
Inventor 郑兴华肖腾刘洋
Owner FUZHOU UNIV
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