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Bismuth potassium titanate-based perovskite ceramic with wide temperature stability and high energy storage density and preparation method thereof

A high energy storage density, potassium bismuth titanate technology, applied in the field of electronic information functional materials and devices, can solve the problems of not getting enough attention, difficult to achieve energy storage applications, low breakdown electric field strength, etc., reaching the dielectric peak Smooth, suitable for high-volume industrial production, process and easy-to-operate results

Active Publication Date: 2022-07-12
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a typical lead-free perovskite material, it has a large spontaneous polarization (~52μC / cm 2 ) has also shown great potential for dielectric capacitor applications, but has not received enough attention
From the research of Yang et al., we know that the reason for the long-term development of bismuth potassium titanate-based ceramic materials is that most bismuth potassium titanate-based ceramics have large remanent polarization, low breakdown electric field strength, and high coercive field. , obvious thermal activation defects and many other shortcomings, it is difficult to realize practical energy storage applications (Chemical Engineering Journal 2021, 414, 128769)

Method used

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  • Bismuth potassium titanate-based perovskite ceramic with wide temperature stability and high energy storage density and preparation method thereof
  • Bismuth potassium titanate-based perovskite ceramic with wide temperature stability and high energy storage density and preparation method thereof
  • Bismuth potassium titanate-based perovskite ceramic with wide temperature stability and high energy storage density and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high energy storage density bismuth potassium titanate-based perovskite ceramic with wide temperature stability and chemical composition is (1-x)(0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 )-xCaTiO 3 , where x=0. Specifically include the following steps:

[0037] Step 1: Select Bi 2 O 3 Powder, Fe 2 O 3 Powder, K 2 CO 3 Powder, CaCO 3 Powder and TiO 2 Powder is the raw material, according to the general formula 0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 and CaTiO 3 Weigh the raw materials respectively, add the same amount of anhydrous ethanol as the powder, and mix the powder evenly to form a slurry after one ball milling;

[0038] Step 2: Bake the slurry obtained in step 1 in a constant temperature oven at 90°C, remove absolute ethanol, and grind it in a mortar to obtain powder; then put the powder in a mold and press it into a material block, will be 0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 The pellets were pre-fired at 850 °C under airtight conditions, and the h...

Embodiment 2

[0043] A high energy storage density bismuth potassium titanate-based perovskite ceramic with wide temperature stability and chemical composition is (1-x)(0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 )-xCaTiO 3 , where x=0.1. Specifically include the following steps:

[0044] Step 1: Select Bi 2 O 3 Powder, Fe 2 O 3 Powder, K 2 CO 3 Powder, CaCO 3 Powder and TiO 2 Powder is the raw material, according to the general formula 0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 and CaTiO 3 Weigh the raw materials respectively, add the same amount of anhydrous ethanol as the powder, and mix the powder evenly to form a slurry after one ball milling;

[0045] Step 2: Bake the slurry obtained in step 1 in a constant temperature oven at 90°C, remove absolute ethanol, and grind it in a mortar to obtain powder; then put the powder in a mold and press it into a material block, will be 0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 The pellets were pre-fired at 850 °C under airtight conditions, and the...

Embodiment 3

[0050] A high energy storage density bismuth potassium titanate-based perovskite ceramic with wide temperature stability and chemical composition is (1-x)(0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 )-xCaTiO 3 , where x=0.2. Specifically include the following steps:

[0051] Step 1: Select Bi 2 O 3 Powder, Fe 2 O 3 Powder, K 2 CO 3 Powder, CaCO 3 Powder and TiO 2 Powder is the raw material, according to the general formula 0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 and CaTiO 3 Weigh the raw materials respectively, add the same amount of anhydrous ethanol as the powder, and mix the powder evenly to form a slurry after one ball milling;

[0052] Step 2: Bake the slurry obtained in step 1 in a constant temperature oven at 90°C, remove absolute ethanol, and grind it in a mortar to obtain powder; then put the powder in a mold and press it into a material block, will be 0.75Bi 0.5 K 0.5 TiO 3 -0.25BiFeO 3 The pellets were pre-fired at 850 °C under airtight conditions, and the...

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Abstract

The invention discloses a bismuth potassium titanate-based perovskite ceramic with wide temperature stability and high energy storage density and a preparation method thereof, and belongs to the field of electric energy storage materials. A solid-phase synthesis method is adopted, a perovskite material Bi < 0.5 > K < 0.5 > TiO < 3 >-0.25 BiFeO < 3 > is taken as a basis, a perovskite material 0.75 Bi < 0.5 > K < 0.5 > TiO < 3 >-0.25 BiFeO < 3 > is obtained through binary compounding, CaTiO < 3 > in a certain molar ratio is doped, the novel ceramic is obtained, the chemical formula of the novel ceramic is (1-x) (0.75 Bi < 0.5 > K < 0.5 > TiO < 3 >-0.25 BiFeO < 3 >)-xCaTiO < 3 >, and x is greater than or equal to 0 and smaller than or equal to 0.6. The obtained pulse energy storage dielectric ceramic material has high recoverable energy storage density Wrecc of 6.34 J / cm < 3 > and high energy storage efficiency eta of 93.3%, under the electric field of 250 kV / cm, the power density PD is 97.07 MW / cm < 3 >, the current density can reach 776.5 A / cm < 2 >, and the energy storage performance is greatly improved compared with that of an existing product. More importantly, the energy storage density only has tiny fluctuation (llt in a wide temperature range of 30-160 DEG C; 4.5%), and shows excellent temperature stability. The preparation method is simple in technological process, suitable for industrial production and capable of meeting the current lead-free and environment-friendly requirements.

Description

technical field [0001] The invention relates to the technical field of electronic information functional materials and devices, in particular to a bismuth potassium titanate-based perovskite ceramic with wide temperature stability and high energy storage density and a preparation method thereof. Background technique [0002] With the increase in energy demand and the consumption of fossil fuels, the problems of improving the utilization rate of traditional energy and broadening the practical scope of new energy have become increasingly prominent, which provides an opportunity for the rapid development of energy storage devices. Among these energy storage elements, dielectric capacitors have been widely used in electromagnetic pulse weapons, hybrid vehicles, biomedical equipment and other fields due to their advantages of ultra-fast charging and discharging speed and high power density, which meet the requirements of new energy development and utilization. application. Facin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/638
CPCC04B35/475C04B35/622C04B35/638C04B2235/3201C04B2235/3208C04B2235/3272C04B2235/602C04B2235/6562C04B2235/6567Y02E60/13
Inventor 牛子昂郑鹏白王峰郑梁张阳
Owner HANGZHOU DIANZI UNIV
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