Bismuth-based lead-free high energy storage density ceramic material and preparation method thereof

A technology of high energy storage density and ceramic materials, applied in the field of ceramic materials, can solve the problems of low energy storage density and efficiency, and achieve the effects of improving energy storage density, improving breakdown field strength, and good temperature stability

Active Publication Date: 2019-02-19
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem of low energy storage density and efficiency of current bismuth-based lead-free ceramic materials, and provides a bismuth-based lead-free electronic ceramic with high energy storage density and efficiency, which is applied to the field of energy storage capacitors

Method used

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  • Bismuth-based lead-free high energy storage density ceramic material and preparation method thereof
  • Bismuth-based lead-free high energy storage density ceramic material and preparation method thereof
  • Bismuth-based lead-free high energy storage density ceramic material and preparation method thereof

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Embodiment 1

[0023] The present invention uses analytically pure grade Bi 2 o 3 、Na 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material, according to the chemical formula 0.65Bi 0.5 Na 0.5 TiO 3 +0.35SrTiO 3 +5.0wt%Nb 2 o 5 , after weighing the raw materials, put them into a ball mill jar, use absolute ethanol as the medium, ball mill for 24 hours, put the obtained slurry into an oven for drying, pass through a 80-mesh sieve, and pre-fire at 850°C for 4 hours. The powder obtained by pre-calcination is crushed, ball milled, dried and passed through a 120-mesh sieve, then added a certain amount of 3wt% PVA aqueous solution to granulate, molded, stayed at 600°C for 2h to remove the glue, and then sintered at 1200-1300°C for 2h . Polish the fired ceramic sheet, burn the silver electrode and let it stand for 24 hours, and finally perform the electrical performance.

Embodiment 2

[0025] The present invention uses analytically pure grade Bi 2 o 3 、Na 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material, according to the chemical formula 0.50Bi 0.5 Na 0.5 TiO 3 +0.50SrTiO 3+1.0wt%Nb 2 o 5 , after weighing the raw materials, put them into a ball mill jar, use absolute ethanol as the medium, ball mill for 24 hours, put the obtained slurry into an oven for drying, pass through a 80-mesh sieve, and pre-fire at 850°C for 4 hours. The powder obtained by pre-calcination is crushed, ball milled, dried and passed through a 120-mesh sieve, then added a certain amount of 3wt% PVA aqueous solution to granulate, molded, stayed at 600°C for 2h to remove the glue, and then sintered at 1200-1300°C for 2h . Polish the fired ceramic sheet, burn the silver electrode and let it stand for 24 hours, and finally perform the electrical performance.

Embodiment 3

[0027] The present invention uses analytically pure grade Bi 2 o 3 、Na 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material, according to the chemical formula 0.60Bi 0.5 Na 0.5 TiO 3 +0.40SrTiO 3 +2.5wt%Nb 2 o 5 , after weighing the raw materials, put them into a ball mill jar, use absolute ethanol as the medium, ball mill for 24 hours, put the obtained slurry into an oven for drying, pass through a 80-mesh sieve, and pre-fire at 850°C for 4 hours. The powder obtained by pre-calcination is crushed, ball milled, dried and passed through a 120-mesh sieve, then added a certain amount of 3wt% PVA aqueous solution to granulate, molded, stayed at 600°C for 2h to remove the glue, and then sintered at 1200-1300°C for 2h . Polish the fired ceramic sheet, burn the silver electrode and let it stand for 24 hours, and finally perform the electrical performance.

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Abstract

The invention discloses a bismuth-based lead-free high energy storage density ceramic material and a preparation method thereof, the material and the preparation method relate to the technical field of electronic ceramics and components, and are used in related fields of energy storage capacitor application. The chemical composition of the material conforms to the general formula: (1-x)Bi0.5Na0.5TiO3+x SrTiO3+ywt%Nb2O5, which is synthesized by traditional ceramic preparation process. Through the addition of Nb, the grain size of ceramics is refined, and the breakdown field strength is increased. The ceramic components can obtain Wrec-1.8J/cm3 energy storage density under a direct current field of E = 13kV/mm, and the energy efficiency eta can reach 80 %; and meanwhile, the material has good temperature stability of energy storage performance.

Description

technical field [0001] The invention relates to a ceramic material used for energy storage electronic components, in particular to a bismuth-based lead-free high energy storage density ceramic material and a preparation method thereof. Background technique [0002] High energy storage density pulse power capacitors have become the basic energy storage components of pulse power technology due to their high power density, high operating voltage, and large discharge current. They are widely used in igniters, high-power microwave weapons, electromagnetic ejections, high-energy lasers and particles. accelerator etc. [0003] At present, in the field of component application, energy storage capacitor components are mainly divided into two types according to the dielectric materials used: organic film capacitors and laminated dielectric ceramic capacitors. Film capacitors use polymer plastic film as the intermediate dielectric material, and the metal electrodes on the film are dep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/47C04B35/622
CPCC04B35/47C04B35/475C04B35/622C04B2235/3201C04B2235/3232C04B2235/3251C04B2235/656C04B2235/6567C04B2235/77
Inventor 周佳骏童兴野宋岷蔚刘红方敬忠
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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