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Bismuth ferrite barium titanate-based ceramics with high energy storage density and high power density and preparation method thereof

A technology of bismuth ferrite, barium titanate and high power density, which is applied in the field of ceramic dielectric materials for pulse power capacitors, can solve the problems of low energy storage density and energy storage efficiency, and achieve improved energy storage performance, high energy storage density, The effect of reducing the coercive field and remnant polarization

Active Publication Date: 2022-05-17
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy storage density and energy storage efficiency of most bismuth ferrite barium titanate-based ceramics are still low (energy storage density3 , energy storage density <80%), which still cannot replace lead-based ceramic materials

Method used

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  • Bismuth ferrite barium titanate-based ceramics with high energy storage density and high power density and preparation method thereof
  • Bismuth ferrite barium titanate-based ceramics with high energy storage density and high power density and preparation method thereof
  • Bismuth ferrite barium titanate-based ceramics with high energy storage density and high power density and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation conforms to the chemical composition (1-x) (0.67BiFeO 3 -0.33BaTiO 3 )-xBaBi 2 Nb 2 o 9 , the lead-free energy storage ceramics of x=0.02, comprising the following steps:

[0039](1) Ingredients: Bi 2 o 3 Powder, Fe 2 o 3 Powder, BaCO 3 Powder, TiO 2 Powder and Nb 2 o 5 Powder is used as raw material, according to the general formula 0.98(0.67BiFeO 3 -0.33BaTiO 3 )-0.02BaBi 2 Nb 2 o 9 The stoichiometry of Bi, Ba, Fe, Ti and Nb in the mixture is batched;

[0040] (2) One-time ball milling: add absolute ethanol equal to the mixture to the above mixture, and continue ball milling for 12 hours, so that the powder is mixed evenly to form a slurry, which can further improve the comprehensive performance of bismuth ferrite barium titanate ceramic materials performance;

[0041] (3) drying: the above slurry is placed in a constant temperature oven to bake, remove absolute ethanol, and grind in a mortar to obtain powder;

[0042] (4) Tablet pre...

Embodiment 2

[0049] The preparation conforms to the chemical composition (1-x) (0.67BiFeO 3 -0.33BaTiO 3 )-xBaBi 2 Nb 2 o 9 , the lead-free energy storage ceramics of x=0.04, comprising the following steps:

[0050] (1) Ingredients: Bi 2 o 3 Powder, Fe 2 o 3 Powder, BaCO 3 Powder, TiO 2 Powder and Nb 2 o 5 Powder is used as raw material, according to the general formula 0.96(0.67BiFeO 3 -0.33BaTiO 3 )-0.04BaBi 2 Nb 2 o 9 The stoichiometry of Bi, Ba, Fe, Ti and Nb in the mixture is batched;

[0051] (2) One-time ball milling: add absolute ethanol equal to the mixture to the above mixture, and continue ball milling for 12 hours, so that the powder is mixed evenly to form a slurry, which can further improve the comprehensive performance of bismuth ferrite barium titanate ceramic materials performance;

[0052] (3) drying: the above slurry is placed in a constant temperature oven to bake, remove absolute ethanol, and grind in a mortar to obtain powder;

[0053] (4) Tablet pr...

Embodiment 3

[0060] The preparation conforms to the chemical composition (1-x) (0.67BiFeO 3 -0.33BaTiO 3 )-xBaBi 2 Nb 2 o 9 , the lead-free energy storage ceramics of x=0.06, comprising the following steps:

[0061] (1) Ingredients: Bi 2 o 3 Powder, Fe 2 o 3 Powder, BaCO 3 Powder, TiO 2 Powder and Nb 2 o 5 Powder is used as raw material, according to the general formula 0.94(0.67BiFeO 3 -0.33BaTiO 3 )-0.06BaBi 2 Nb 2 o 9 The stoichiometry of Bi, Ba, Fe, Ti and Nb in the mixture is batched;

[0062] (2) One-time ball milling: add absolute ethanol equal to the mixture to the above mixture, and continue ball milling for 12 hours, so that the powder is mixed evenly to form a slurry, which can further improve the comprehensive performance of bismuth ferrite barium titanate ceramic materials performance;

[0063] (3) drying: the above slurry is placed in a constant temperature oven to bake, remove absolute ethanol, and grind in a mortar to obtain powder;

[0064] (4) Tablet pr...

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Abstract

The invention discloses a bismuth ferrite barium titanate-based ceramic with high energy storage density and high power density and a preparation method thereof, using 0.67BiFeO 3 ‑0.33 BaTiO 3 Based on the system ferroelectric material, the bismuth layered material BaBi 2 Nb 2 o 9 According to a certain molar ratio, it is mixed into bismuth ferrite barium titanate-based ceramics, and a new type of energy storage ceramic material with high energy storage density and high power density is prepared by using a solid-state synthesis method. The chemical composition of the ceramic material is (1‑x) (0.67BiFeO 3 ‑0.33 BaTiO 3 )‑xBaBi 2 Nb 2 o 9 , where 0.02≤x≤0.1. The energy storage ceramic material that the present invention obtains, main performance parameter can utilize energy storage density W rec =3.09J / cm 3 , energy storage efficiency η=85.6%, under 100kV / cm electric field, power density P D =27.2MW / cm 3 , the current density can reach 543.95A / cm 2 . In addition, the preparation process is stable and reliable, the production cost is low, industrialized production is easy to realize, and at the same time, it meets the current requirements for lead-free environmental protection. It can be widely used in high-power microwave weapons, laser weapons, electromagnetic launchers, and pulse power systems of hybrid vehicles.

Description

technical field [0001] The invention relates to a bismuth ferrite barium titanate-based ceramic material with high energy storage density and high power density and a preparation method thereof, in particular to a bismuth-doped layered material BaBi 2 Nb 2 o 9 The invention relates to the preparation of bismuth ferrite barium titanate ceramics, belonging to the field of ceramic dielectric materials for pulse power capacitors. Background technique [0002] In recent years, with the miniaturization and integration of electronic components, this has put forward higher requirements for electronic materials. Compared with energy storage devices such as batteries and chemical capacitors, dielectric capacitors have the advantages of high power density, fast discharge speed, and long service life. Bulk ceramic dielectric capacitors have higher temperature stability and total energy storage. It can be widely used in high-power pulse weapons, electromagnetic launchers, energy stora...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/63
CPCC04B35/26C04B35/622C04B35/6303C04B2235/3215C04B2235/3232C04B2235/3251C04B2235/3298C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567Y02P40/60
Inventor 郑鹏陈志腾白兴智白王峰郑梁张阳
Owner HANGZHOU DIANZI UNIV
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