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A kind of lead-free low dielectric loss and high energy storage density ceramics with sandwich structure and preparation method thereof

A high energy storage density, sandwich technology, applied in the field of energy storage ceramics, can solve the problems of electric field strength, energy storage density and energy storage efficiency to be improved, achieve shortened drying time, good stability and rheology, and mature technology Effect

Active Publication Date: 2019-10-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the electric field strength, energy storage density and energy storage efficiency of lead-free energy storage ceramic dielectric materials need to be improved

Method used

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  • A kind of lead-free low dielectric loss and high energy storage density ceramics with sandwich structure and preparation method thereof
  • A kind of lead-free low dielectric loss and high energy storage density ceramics with sandwich structure and preparation method thereof
  • A kind of lead-free low dielectric loss and high energy storage density ceramics with sandwich structure and preparation method thereof

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preparation example Construction

[0038] The preparation method of the lead-free low dielectric loss and high energy storage density ceramics with a sandwich structure of the present invention comprises the following steps:

[0039] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 and TiO 2 After batching, use absolute ethanol as the medium, mix evenly through ball milling for 12-16 hours, then dry at 100°C, pass through a 120-mesh sieve, briquette, and pre-calcine at 1150-1200°C for 3-5 hours to obtain blocks shape solid, and then crush the massive solid through a 120-mesh sieve to obtain SrTiO 3 Powder;

[0040] (2) According to chemical formula (1-x) SrTiO 3 -xBaFe 0.5 Nb 0.5 o 3 The powder is prepared by the following process: First, according to the chemical formula BaFe 0.5 Nb 0.5 o 3 will analyze pure BaCO 3 , Fe 2 o 3 and Nb 2 o 5 Carry out ingredients and mix evenly, then sieve and briquette, and then pre-fire at 1200-1250°C for 3-4 hours to obtain a block solid, t...

Embodiment 1

[0053] The chemical formula of the present embodiment ceramic material is: SrTiO 3 / ((1-x)SrTiO 3 -xBaFe 0.5 Nb 0.5 o 3 ) / SrTiO 3 , where x represents BaFe 0.5 Nb 0.5 o 3 The mole fraction of x=0.05.

[0054] The preparation method of the above-mentioned lead-free high energy storage density ceramic material comprises the following steps:

[0055] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 and TiO 2 After batching, use absolute ethanol as the medium, mix evenly through ball milling for 12 hours, then dry at 100°C, pass through a 120-mesh sieve, briquette, and pre-calcine at 1150°C for 5 hours to obtain a block solid, and then the block After the solid is crushed and passed through a 120-mesh sieve, the SrTiO 3 Powder;

[0056] (2) According to the chemical formula 0.95SrTiO 3 -0.05BaFe 0.5 Nb 0.5 o 3 The powder is prepared by the following process: First, according to the chemical formula BaFe 0.5 Nb 0.5 o 3 will analyze pure BaC...

Embodiment 2

[0063] The chemical formula of the present embodiment ceramic material is: SrTiO 3 / ((1-x)SrTiO 3 -xBaFe 0.5 Nb 0.5 o 3 ) / SrTiO 3 , where x represents BaFe 0.5 Nb 0.5 o 3 The mole fraction of x=0.10.

[0064] The preparation method of the above-mentioned lead-free high energy storage density ceramic material comprises the following steps:

[0065] (1) According to the chemical formula SrTiO 3 will analyze pure SrCO 3 and TiO 2 After batching, use absolute ethanol as the medium, mix evenly through ball milling for 12 hours, then dry at 100°C, pass through a 120-mesh sieve, briquette, and pre-calcine at 1200°C for 3 hours to obtain a block solid, and then the block After the solid is crushed and passed through a 120-mesh sieve, the SrTiO 3 Powder;

[0066] (2) According to the chemical formula 0.90SrTiO 3 -0.10BaFe 0.5 Nb 0.5 o 3 The powder is prepared by the following process: First, according to the chemical formula BaFe 0.5 Nb 0.5 o 3 will analyze pure BaC...

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Abstract

The invention discloses sandwich structured lead-free ceramic with low dielectric loss and high energy storage density and a preparation method thereof. The preparation method comprises the followingsteps: uniformly mixing an organic solvent and an emulsifier, then adding SrTiO3 powder, a binder, a dispersant and a plasticizer, and uniformly mixing to obtain SrTiO3 tape casting slurry; preparing(1-x)SrTiO3-xBaFe0.5Nb0.5O3 casting slurry with the same tape casting method; respectively carrying out tape casting on the two tape casting slurry in the manner of tape casting to obtain two kinds oftape casting film; and carrying out superposition, pressurization, rubber discharging and sintering to obtain the sandwich-structured lead-free ceramic. The ceramic has the advantages that the preparation process is simple and the technology is mature, is suitable for industrial production, has excellent energy storage characteristics, has the discharge energy density between 1.67 and 1.90 J / cm<3> calculated based on ferroelectric hysteresis loop, the energy storage efficiency of 86% and the electric field strength of 300kV / cm or above, and can exhibit a lower dielectric loss value.

Description

technical field [0001] The invention belongs to the field of energy storage ceramics, in particular to a lead-free low dielectric loss and high energy storage density ceramic with a sandwich structure and a preparation method thereof. Background technique [0002] High energy storage density dielectrics have high energy density and high power density, and can be used to develop high-capacity capacitors. They have great application potential in pulse power technology, power electronic circuits, electric vehicles, and grid power regulation. Compared with batteries and other energy storage devices, ceramic capacitors have the advantages of fast charging and discharging and high temperature stability. However, most of the existing lead-free energy storage ceramic dielectric materials currently have insufficient breakdown strength or low polarization strength, resulting in low energy storage density and difficulty in meeting the needs of continuous development of new technologies...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/47C04B35/622
Inventor 杨海波邱云闫非林营
Owner SHAANXI UNIV OF SCI & TECH
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