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A lead-free high energy storage density high energy storage efficiency ceramic dielectric material and preparation method thereof

A technology of high energy storage density and ceramic medium, applied in the field of dielectric energy storage ceramic materials, can solve the problems of low energy storage density and limited application of materials, and achieve the effects of good energy storage performance, increased breakdown strength, and simple preparation process.

Inactive Publication Date: 2016-08-24
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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  • A lead-free high energy storage density high energy storage efficiency ceramic dielectric material and preparation method thereof
  • A lead-free high energy storage density high energy storage efficiency ceramic dielectric material and preparation method thereof
  • A lead-free high energy storage density high energy storage efficiency ceramic dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency, the chemical formula is 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 above-mentioned preparation method of lead-free high energy storage density and high energy storage efficiency energy storage medium ceramics, the steps are as follows:

[0052] (1) According to the molar ratio, it is Na 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) proportion of ingredients, put the prepared raw materials into the ball mill, zirconia balls and anhydrous ethanol as the medium, mix the ball mill for 26 hours and mix well, after drying The ceramic powder is obtained by pre-calcining in a medium-temperature furnace. The pre-calcining process is to raise the temperature to 900 °C at a heating rate of 2 °C / min at room temperature, keep the temperature for 2 hours, and then ...

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

[0060] (1) According to the molar ratio, it is Na 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 fu...

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, whose chemical formula is (1-x)[0.84(Bi 0.5 Na 0.5 ) TiO 3 ‑0.16 (Bi 0.5 K 0.5 ) TiO 3 ]‑xK 0.5 Na 0.5 NbO 3 , where x=0.06~0.15, its energy storage density is 1.51~1.89J / cm 3 , the energy storage efficiency is 58.1-78.4%. The steps of the preparation method of the energy storage medium ceramic material are as follows: (1) put the raw materials into a ball mill, mix and ball mill them with a wet ball milling method, dry and pre-calcine to obtain a ceramic powder; (2) add viscose powder to the ceramic powder The binder is mixed evenly, and the ceramic green sheet is pressed; (3) the ceramic green sheet is debonded and sintered by a two-step sintering method to obtain a lead-free energy storage ceramic dielectric material with high energy storage density and high energy storage efficiency. The method has simple preparation process, low cost and no pollution, and the prepared ceramic material has relatively high energy storage density and 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 Patents(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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