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A lead-free low loss high energy storage density ceramic material and its preparation method

A technology of high energy storage density and ceramic material, applied in the field of lead-free, low loss, high energy storage density ceramic materials and their preparation, which can solve the problems of low energy storage density, limited application, low saturation polarization and the like

Active Publication Date: 2020-10-27
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But SrTiO 3 The saturation polarization of ceramics is small, resulting in low energy storage density, which limits its application in practical production

Method used

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  • A lead-free low loss high energy storage density ceramic material and its preparation method
  • A lead-free low loss high energy storage density ceramic material and its preparation method
  • A lead-free low loss high energy storage density ceramic material and its preparation method

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preparation example Construction

[0055] The preparation method of the lead-free low loss high energy storage density ceramic material of the present invention comprises the following steps:

[0056] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 and TiO 2 Carry out ingredients and mix evenly, then sieve, briquette, and then pre-fire at 1150-1200°C for 3-5 hours to obtain a block solid, then crush the block solid and pass through a 120-mesh sieve to obtain SrTiO 3 Powder;

[0057] (2) According to the chemical formula 0.95Bi 0.5 Na 0.5 TiO 3 -0.05BaAl 0.5 Nb 0.5 o 3 Bi 2 o 3 、Na 2 CO 3 、TiO 2 、BaCO 3 、Al 2 o 3 and Nb 2 o 5 Perform batching and mixing evenly, then sieve, briquette, and then pre-fire at 850-900°C for 3-4 hours to obtain block solids, then crush the block solids and sieve to obtain 0.95Bi 0.5 Na 0.5 TiO 3 -0.05BaAl 0.5 Nb 0.5 o 3 Powder;

[0058] (3) the SrTiO in step (1) 3 Powder and 0.95Bi in step (2) 0.5 Na 0.5 TiO 3 -0.05BaAl 0.5 Nb 0.5 o...

Embodiment 1

[0069] The chemical formula of lead-free low loss high energy storage density ceramic material is: (1-x)SrTiO 3 -x(0.95Bi 0.5 Na 0.5 TiO 3 -0.05BaAl 0.5 Nb 0.5 o 3 ), where x represents 0.95Bi 0.5 Na 0.5 TiO 3 -0.05BaAl 0.5 Nb 0.5 o 3 Mole fraction, and x=0.1.

[0070] The preparation method of the above-mentioned lead-free low loss high energy storage density ceramic material comprises the following steps:

[0071] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 and TiO 2 Carry out ingredients and mix evenly, then sieve, briquette, and then pre-fire at 1150°C for 5 hours to obtain a block solid, then crush the block solid and pass through a 120-mesh sieve to obtain SrTiO 3 Powder;

[0072] (2) According to the chemical formula 0.95Bi 0.5 Na 0.5TiO 3 -0.05BaAl 0.5 Nb 0.5 o 3 Bi 2 o 3 、Na 2 CO 3 、TiO 2 、BaCO 3 、Al 2 o 3 and Nb 2 o 5 Carry out ingredients and mix evenly, then sieve, briquette, and then pre-fire at 900°C for ...

Embodiment 2

[0080] The chemical formula of lead-free low loss high energy storage density ceramic material is: (1-x)SrTiO 3 -x(0.95Bi 0.5 Na 0.5 TiO 3 -0.05BaAl 0.5 Nb 0.5 o 3 ), where x represents 0.95Bi 0.5 Na 0.5 TiO 3 -0.05BaAl 0.5 Nb 0.5 o 3 Mole fraction, and x=0.2.

[0081] The preparation method of the above-mentioned lead-free low loss high energy storage density ceramic material comprises the following steps:

[0082] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 and TiO 2 Carry out ingredients and mix evenly, then sieve, briquette, and then pre-fire at 1160°C for 5 hours to obtain a block solid, then crush the block solid and pass through a 120-mesh sieve to obtain SrTiO 3 Powder;

[0083] (2) According to the chemical formula 0.95Bi 0.5 Na 0.5 TiO 3 -0.05BaAl 0.5 Nb 0.5 o 3 Bi 2 o 3 、Na 2 CO 3 、TiO 2 、BaCO 3 、Al 2 o 3 and Nb 2 o 5 Carry out ingredients and mix evenly, then sieve, briquette, and then pre-fire at 890°C for...

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Abstract

The invention relates to a lead-free low-loss high-energy-density ceramic material and a preparation method thereof. The preparation method comprises the steps of compounding according to a chemical formula (1-x)SrTiO3-x(0.95Bi0.5Na0.5TiO3-0.05BaAl0.5Nb0.5O3), wherein x is a mole fraction, and is larger than or equal to 0.1 and less than or equal to 0.8; ball-milling and drying to obtain raw material powder; adding an adhesion agent into the obtained raw material powder, pelleting, after ageing for 24 to 48 hours, pressing into tablets, after discharging adhesives, sintering at 1225 to 1350 DEG C, and obtaining the lead-free low-loss high-energy-density ceramic material. The ceramic material provided by the invention is simple and stable in preparation process, suitable for industrial production, low in dielectric loss, and excellent in energy storage property, and has the energy storage density being between 1.40 to 1.89J / cm<3> and the energy storage efficiency being between 72 to 97 percent calculated based on a ferroelectric hysteresis loop.

Description

technical field [0001] The invention relates to the technical field of dielectric energy storage ceramic materials, in particular to a lead-free low loss high energy storage density ceramic material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of information technology, ceramic capacitors with high energy storage density have the advantages of fast charge and discharge speed, anti-cycle aging, and are suitable for extreme environments such as high temperature and high pressure, and play an increasingly important role in various power and electronic systems. important role. Facing the development trend of electronic components towards lead-free, miniaturization, miniaturization and integration, the energy storage density of the current lead-free energy storage ceramic capacitors is far from meeting the application requirements. Therefore, further improving the energy storage density of lead-free energy storage ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/47
CPCC04B35/47C04B35/475C04B2235/3217C04B2235/3255C04B2235/442C04B2235/96
Inventor 杨海波闫非林营
Owner SHAANXI UNIV OF SCI & TECH
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