Lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency and preparation method thereof

A high energy storage density, ceramic medium technology, applied in the field of dielectric energy storage ceramic materials, can solve the problems of limited material application, low energy storage density, etc., to increase breakdown strength, good energy storage performance, improve energy storage density and The effect of energy storage efficiency

Inactive Publication Date: 2014-11-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this lead-free material system meets the mainstream development trend of green and environmentally friendly materials, the practical application of this system material is limited due to the low energy storage density.

Method used

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  • Lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency and preparation method thereof
  • Lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency and preparation method thereof
  • Lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A lead-free high energy storage density high energy storage efficiency ceramic dielectric material with a chemical formula of 0.94[0.84(Bi 0.5 Na 0.5 )TiO 3 -0.16 (Bi 0.5 K 0.5 )TiO 3 ]-0.06K 0.5 Na 0.5 NbO 3 .

[0051] The preparation method of the above lead-free high energy storage density and high energy storage efficiency energy storage medium ceramics, the steps are as follows:

[0052] (1) Na according to the molar ratio 2 CO 3 :K 2 CO 3 : Bi 2 o 3 : TiO 2 : Nb 2 o 5 = 0.2124:0.0526:0.235:0.94:0.03 (x=0.06) ratio ingredients, put the prepared raw materials into the ball mill, zirconia balls and absolute ethanol as the medium, mix the ball mill for 26 hours and mix evenly, after drying Place it in a medium-temperature furnace for pre-calcination to obtain ceramic powder. The pre-calcination process is to raise the temperature to 900°C at a rate of 2°C / min at room temperature, keep it for 2 hours, and cool naturally with the furnace;

[0053] (2) ...

Embodiment 2

[0058] A lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency, the chemical formula is 0.91[0.84(Bi 0.5 Na 0.5 )TiO 3 -0.16 (Bi 0.5 K 0.5 )TiO 3 ]-0.09K 0.5 Na 0.5 NbO 3 .

[0059] The preparation method of the above lead-free high energy storage density and high energy storage efficiency energy storage medium ceramics, the steps are as follows:

[0060] (1) Na according to the molar ratio 2 CO 3 :K 2 CO 3 : Bi 2 o 3 : TiO 2 : Nb2 o 5 =0.2136:0.0589:0.2275:0.91:0.045 (x=0.09) ratio ingredients, put the prepared raw materials into the ball mill, zirconia balls and absolute ethanol as the medium, mix the ball mill for 22 hours and mix evenly, after drying Place it in a medium-temperature furnace for pre-calcination to obtain ceramic powder. The pre-calcination process is to raise the temperature to 850 °C at a rate of 2 °C / min at room temperature, keep it for 2 hours, and cool naturally with the furnace;

[00...

Embodiment 3

[0066] A lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency, the chemical formula is 0.88[0.84(Bi 0.5 Na 0.5 )TiO 3 -0.16 (Bi 0.5 K 0.5 )TiO 3 ]-0.12K 0.5 Na 0.5 NbO 3 .

[0067] The preparation method of the above lead-free high energy storage density and high energy storage efficiency energy storage medium ceramics, the steps are as follows:

[0068] (1) Na according to the molar ratio 2 CO 3 :K 2 CO 3 : Bi 2 o 3 : TiO 2 : Nb 2 o 5 =0.2148:0.0652:0.22:0.88:0.06 (x=0.12) ratio ingredients, put the prepared raw materials into the ball mill, zirconia balls and absolute ethanol as the medium, mix the ball mill for 26 hours and mix evenly, after drying Place it in a medium-temperature furnace for pre-calcination to obtain ceramic powder. The pre-calcination process is to raise the temperature to 850°C at a rate of 4°C / min at room temperature, keep it warm for 2 hours, and cool naturally with the furnace;

[...

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Abstract

The invention provides a lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency, of which the chemical formula is (1-x) [0.84 (Bi0.5 Na0.5) TiO3-0.16 (Bi0.5 K0.5) TiO3]-xK0.5 Na0.5 NbO3, wherein x is equal to 0.06-0.15, the energy storage density is 1.51-1.89 J/cm<3>, and the energy storage efficiency is 58.1-78.4%. A preparation method of the lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency comprises the following steps: (1) after raw materials are prepared, putting the materials into a ball mill to carry out mixed ball-milling by using a wet ball-milling method, and drying and pre-calcining the obtained substance so as to obtain ceramic powder; (2) adding a binder into the ceramic powder, mixing the obtained mixture, and pressing the obtained mixture so as to obtain a green ceramic blank piece; and (3) carrying out batch drop on the green ceramic blank piece, and sintering the obtained substance by using a two-step sintering method, so that the lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency is obtained. The method is simple in preparation process and low in cost, and has no pollution, and the prepared ceramic material has a relatively high energy storage density and relatively high energy storage efficiency at room temperature.

Description

technical field [0001] The invention relates to the technical field of dielectric energy storage ceramic materials, in particular to a lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency and a preparation method thereof. Background technique [0002] Capacitors with high energy storage density are widely used in modern industries such as pulse power systems, oil and gas deep well exploration, hybrid vehicles, new energy power generation, etc., and play an increasingly important role in power and electronic systems. With the rapid development of electronic information, the miniaturization and integration of electronic devices has put forward higher requirements for the energy storage density of energy storage components. [0003] Due to the characteristic double hysteresis loops of antiferroelectric materials, they have the advantages of high energy storage density and high energy storage efficiency, so antiferroelectric m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 曹明贺赵杰峰刘韩星许琪王志建郝华尧中华
Owner WUHAN UNIV OF TECH
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