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A kind of Bnt-based three-layer structure high energy storage density ceramics and preparation method thereof

A technology with high energy storage density and three-layer structure, applied in the field of preparation of ceramic dielectric energy storage materials, can solve the problems of low electric field strength and unsatisfactory energy storage density, and achieve high breakdown electric field, good temperature stability and The effect of frequency stability and simple process

Active Publication Date: 2022-08-05
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure BNT has many defects, such as large residual plan and coercive field, low electric field strength, and it is difficult to improve all defects at the same time even by ion doping, resulting in unsatisfactory energy storage density.

Method used

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  • A kind of Bnt-based three-layer structure high energy storage density ceramics and preparation method thereof
  • A kind of Bnt-based three-layer structure high energy storage density ceramics and preparation method thereof
  • A kind of Bnt-based three-layer structure high energy storage density ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A BNT-based three-layered ceramic with high energy storage density, the general chemical formula of its superstructure is 0.8Bi 0.5 Na 0.5 TiO 3 -0.2Sr 0.7 Sm 0.2 TiO 3 , the chemical formula of the middle structure is 0.7Bi 0.5 Na 0.5 TiO 3 -0.3Sr 0.7 Sm 0.2 TiO 3 , the chemical formula of the underlying structure is 0.55Bi 0.5 Na 0.5 TiO 3 -0.45Sr 0.7 Sm 0.2 TiO 3 .

[0039] A preparation method of BNT-based three-layer structure high energy storage density ceramics, comprising the following steps:

[0040]S1: Preparation of components of each layer: drying each raw material at 250°C for 10 hours to remove moisture, and then batching according to the stoichiometry in the general chemical formula of each layer to obtain the raw material components of each layer, and combining the raw material components of each layer Distributed with absolute ethanol at a mass ratio of 1:1 and ball milled at a speed of 200 r / min for 10 hours, wherein the diameters of t...

Embodiment 2

[0046] A BNT-based three-layered ceramic with high energy storage density, the general chemical formula of its superstructure is 0.8Bi 0.5 Na 0.5 TiO 3 -0.2Sr 0.7 Sm 0.2 TiO 3 , the chemical formula of the middle structure is 0.7Bi 0.5 Na 0.5 TiO 3 -0.3Sr 0.7 Sm 0.2 TiO 3 , the chemical formula of the underlying structure is 0.55Bi 0.5 Na 0.5 TiO 3 -0.45Sr 0.7 Sm 0.2 TiO 3 .

[0047] A preparation method of BNT-based three-layer structure high energy storage density ceramics, comprising the following steps:

[0048] S1: Preparation of components of each layer: drying each raw material at 300°C for 12 hours to remove moisture, and then batching according to the stoichiometry in the general chemical formula of each layer to obtain the raw material components of each layer, and combining each layer of raw material group Distributed with absolute ethanol at a mass ratio of 1:1 and ball milled at a speed of 300r / min for 12h, wherein the diameters of the zirconium b...

Embodiment 3

[0054] A BNT-based three-layered ceramic with high energy storage density, the general chemical formula of its superstructure is 0.8Bi 0.5 Na 0.5 TiO 3 -0.2Sr 0.7 Sm 0.2 TiO 3 , the chemical formula of the middle structure is 0.7Bi 0.5 Na 0.5 TiO 3 -0.3Sr 0.7 Sm 0.2 TiO 3 , the chemical formula of the underlying structure is 0.55Bi 0.5 Na 0.5 TiO 3 -0.45Sr 0.7 Sm 0.2 TiO 3 .

[0055] A preparation method of BNT-based three-layer structure high energy storage density ceramics, comprising the following steps:

[0056] S1: Preparation of components of each layer: drying each raw material at 350°C for 14 hours to remove moisture, and then batching according to the stoichiometry in the general chemical formula of each layer to obtain the raw material components of each layer, and combining the raw material components of each layer Distributed with absolute ethanol at a mass ratio of 1:1 and ball-milled at a speed of 400r / min for 10-15h, wherein the diameters of the...

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Abstract

The invention discloses a BNT-based three-layer structure high energy storage density ceramic, the general chemical formula of which is (1-x)Bi 0.5 Na 0.5 TiO 3 ‑xSr 0.7 Sm 0.2 TiO 3 . The invention also discloses a preparation method of a BNT-based three-layer structure high-energy-storage-density ceramic, comprising: S1: drying each raw material to remove moisture, batching to obtain raw material components of each layer, and performing ball milling, pre-sintering, and secondary steps in sequence. Ball milling; S2: respectively adding polyvinyl alcohol solution for granulation; S3: respectively performing pre-pressing to obtain green bodies of components of each layer, and placing the green bodies of components of each layer in the upper, middle and lower order for pre-pressing again, and then pressing again Forming; S4: put into a muffle furnace for debinding, sintering at high temperature, and cool down to obtain an initial sample; S5: perform double-sided grinding and polishing, coating silver electrodes, and firing silver electrodes to obtain the final product. The ceramic prepared by the invention has the characteristics of high energy storage density, good temperature stability and good frequency stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic dielectric energy storage materials, in particular to a BNT-based three-layer structure high energy storage density ceramic and a preparation method thereof. Background technique [0002] With the continuous development of human science and technology, people's demand for energy is increasing day by day, but traditional fossil fuels will not only pollute the environment but also face depletion with people's crazy exploitation. Under this circumstance, researchers in various countries have spent a lot of energy and material resources on the research of renewable energy and clean energy, such as wind energy, solar energy, tidal energy and geothermal energy. Therefore, energy storage devices for harvesting and storing the electrical energy generated by these energy sources have also received extensive attention. Among numerous energy storage technologies, dielectric ceramic capacitors...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/47C04B35/622C04B35/638C04B35/64
CPCC04B35/475C04B35/47C04B35/622C04B35/638C04B35/64C04B2235/6562C04B2235/6567C04B2235/6565C04B2235/95C04B2235/96
Inventor 冯琴王萌韦悦周罗能能罗朝映蒙丹
Owner GUANGXI UNIV
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