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A strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency and its preparation method

A technology based on lead-free high energy storage and energy storage efficiency, which is applied to the components of fixed capacitors and the dielectric of fixed capacitors. Density and energy storage efficiency, excellent energy storage characteristics, and the effect of high energy storage density

Active Publication Date: 2020-04-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

SrTiO 3 Ceramic is an excellent dielectric material with high dielectric constant, low dielectric loss, good temperature stability and high breakdown field strength, but SrTiO 3 The saturation polarization of ceramics is small and the energy storage density is low, which limits its application in actual production

Method used

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  • A strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency and its preparation method
  • A strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency and its preparation method
  • A strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency and its preparation method

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preparation example Construction

[0050] The preparation method of the high energy storage density and energy storage efficiency medium ceramic material of the present invention comprises the following steps:

[0051] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 、TiO 2 After preparation, use absolute ethanol as the medium, mix uniformly by ball milling, then dry at 100°C, pass through a 120-mesh sieve, briquette, and then pre-calcine at 1150-1200°C for 3-5 hours to obtain blocky solids, and then Crush the massive solid and pass through a 120-mesh sieve to obtain SrTiO 3 Powder;

[0052] (2) According to the chemical formula 0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 will analyze pure BaCO 3 、Na 2 CO 3 、 Bi 2 o 3 、TiO 2 After preparation, use absolute ethanol as the medium, mix evenly by ball milling, then dry at 100°C, pass through a 120-mesh sieve, briquette, and then pre-calcine at 900-950°C for 3-5 hours to obtain blocky solids, and then Crush the massive solid and pass thr...

Embodiment 1

[0064] The chemical formula of strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency is: (1-x)SrTiO 3 -x(0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 ), where x is 0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 The mole percentage of , and x=0.1.

[0065] The method for preparing the strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency includes the following steps:

[0066] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 、TiO 2 After preparation, it is mixed uniformly by ball milling for 24 hours, then dried at 100°C, passed through a 120-mesh sieve, compacted, and then pre-fired at 1150°C for 4 hours to obtain a blocky solid, and then the blocky solid was crushed and passed through a 120-mesh sieve , to get SrTiO 3 Powder;

[0067] (2) According to the chemical formula 0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 will analyze pure ...

Embodiment 2

[0074] The chemical formula of strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency is: (1-x)SrTiO 3 -x(0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 ), where x is 0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 The mole percentage, and x = 0.2.

[0075] The method for preparing the strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency includes the following steps:

[0076] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 、TiO 2 After preparation, it is mixed uniformly by ball milling for 23 hours, then dried at 100°C, passed through a 120-mesh sieve, briquetted, and then pre-fired at 1175°C for 4 hours to obtain a blocky solid, and then the blocky solid was crushed and passed through a 120-mesh sieve , to get SrTiO 3 Powder;

[0077] (2) According to the chemical formula 0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 will analyze pure B...

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Abstract

The invention relates to a strontium titanate-based lead-free high-energy storage density and high-energy storage efficiency ceramic material and a preparation method thereof. The preparation method comprises the following steps: firstly batching according to a chemical formula (1-x)SrTiO3-x(0.65BaTiO3-0.35Bi0.5Na0.5TiO3), wherein x represents a molar fraction and is greater than or equal to 0.1 but less than or equal to 0.6; ball-milling and drying to obtain a raw material powder body; adding the obtained raw material powder body into a bonding agent for pelleting, decaying for 24-48 hours, pressing into a sheet, performing glue removal treatment and sintering at a temperature of 1250-1350 DEG C to obtain the strontium titanate-based lead-free high-energy storage density and high-energy storage efficiency ceramic material. The ceramic material provided by the invention is simple and stable in preparation process, suitable for industrial production and excellent in energy storage characteristics, the energy storage density calculated based on a ferroelectric hysteresis loop is 0.961-1.403 J / cm<3>, and the energy storage efficiency is 84.77-91.63 percent.

Description

【Technical field】 [0001] The invention relates to the technical field of dielectric materials for energy storage capacitors, in particular to a strontium titanate-based lead-free ceramic material with high energy storage density and high energy storage efficiency and a preparation method thereof. 【Background technique】 [0002] With the continuous development of information technology, the miniaturization and multi-functionalization of devices, ceramics with high energy storage density and high energy storage efficiency are the key materials for making small, large-capacity, and high-efficiency capacitors. Because high energy storage density ceramic capacitors have the advantages of high energy storage density, fast charge and discharge speed, anti-cycle aging, high mechanical strength, suitable for extreme environments such as high temperature and high pressure, and stable performance, they meet the requirements of new energy development and utilization, and are widely used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G4/12C04B35/47C04B35/622
CPCC04B35/47C04B35/622C04B2235/3201C04B2235/3213C04B2235/3215C04B2235/3232C04B2235/3236C04B2235/3298C04B2235/96
Inventor 杨海波闫非林营高淑雅朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH
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