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A kind of lead-free high energy storage density ceramic material and preparation method thereof

A technology of high energy storage density and ceramic material, applied in the field of energy storage ceramics, can solve the problems of high dielectric constant, limited application range, small dielectric constant, etc., to improve the dielectric constant, simple preparation process, energy storage Excellent effect

Active Publication Date: 2021-05-07
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

AgNbO 3 Antiferroelectric materials such as antiferroelectric materials are difficult to promote due to their high cost. Most other antiferroelectric materials contain lead elements. The existence of a large amount of lead and lead oxides will cause serious pollution to the human body and the environment. Therefore, people are currently working to protect the environment. Committed to lead-free
The second category is organic films, such as polyvinylidene fluoride (PVDF) films, polypropylene films, polyester films, etc., which have very high breakdown field strength, but the dielectric constant is very small and the operating temperature range is relatively narrow, resulting in Its scope of application is severely limited
The third category is the composite dielectric material formed by ceramics and glass or ceramics and polymers. This type of material has a high breakdown electric field, but the mass production technology is not yet mature.
The fourth category is ferroelectric ceramic materials such as barium titanate and sodium bismuth titanate. These materials have high dielectric constant and low dielectric loss. The related production technology is very mature, but the energy storage density is usually less than 1J / cm 3 , The temperature stability of the energy storage density is not good, and the dielectric constant is unstable with the change of temperature and frequency

Method used

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  • A kind of lead-free high energy storage density ceramic material and preparation method thereof
  • A kind of lead-free high energy storage density ceramic material and preparation method thereof
  • A kind of lead-free high energy storage density ceramic material and preparation method thereof

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preparation example Construction

[0036] The preparation method of the lead-free high energy storage density ceramic material of the present invention comprises the following steps:

[0037] (1) According to chemical formula (1-x) (0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 )-xSrY 0.5 Nb 0.5 o 3 will analyze pure BaCO 3 、Na 2 CO 3 , SrCO 3 , Bi 2 o 3 ,TiO 2 , Y 2 o 3 and Nb 2 o 5 After batching, use absolute ethanol as the medium, mix evenly through ball milling for 20-24 hours, then dry at 100°C, pass through a 120-mesh sieve, briquette, and then pre-calcine at 800-850°C for 3-5 hours to obtain blocks shape solid, and then crush the massive solid through a 120-mesh sieve to obtain (1-x)(0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 )-xSrY 0.5 Nb 0.5 o 3 Powder;

[0038] (2) The calcined powder in step (1) is subjected to ball milling; with absolute ethanol as the medium, the planetary ball mill is used for ball milling for 20 to 24 hours, then dried at 100°C, and passed through a 120-mesh sieve to ob...

Embodiment 1

[0049] The chemical formula of the ceramic material in this case is: (1-x)(0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 )-xSrY 0.5 Nb 0.5 o 3 , where x represents the mole fraction, and x=0.06.

[0050] The preparation method of the above-mentioned lead-free high energy storage density ceramic material comprises the following steps:

[0051] (1) According to the chemical formula 0.94 (0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 )-0.06SrY 0.5 Nb 0.5 o 3 will analyze pure BaCO 3 、Na 2 CO 3 , SrCO 3 , Bi 2 o 3 ,TiO 2 , Y 2 o 3 and Nb 2 o 5 After weighing the ingredients, use absolute ethanol as the medium, mix evenly by ball milling for 24 hours, then dry at 100°C, pass through a 120-mesh sieve, briquette, and pre-calcine at 850°C for 3 hours to obtain a block solid, and then Crush the massive solid and pass it through a 120-mesh sieve to obtain lead-free high-energy-storage ceramic powder;

[0052] (2) The calcined powder in step (1) is subjected to secondary ball mill...

Embodiment 2

[0058] The chemical formula of the ceramic material in this case is: (1-x)(0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 )-xSrY 0.5 Nb 0.5 o 3 , wherein x represents the mole fraction, and x=0.08.

[0059] The preparation method of the above-mentioned lead-free high energy storage density ceramic material comprises the following steps:

[0060] (1) According to the chemical formula 0.92 (0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 )-0.08SrY 0.5 Nb 0.5 o 3 will analyze pure BaCO 3 、Na 2 CO 3 , SrCO 3 , Bi 2 o 3 ,TiO 2 , Y 2 o 3 and Nb 2 o 5 After batching, use absolute ethanol as the medium, mix evenly by ball milling for 23.5 hours, then dry at 100°C, pass through a 120-mesh sieve, briquette, and then pre-calcine at 840°C for 3.5 hours to obtain block solids, and then block The solid is crushed and passed through a 120-mesh sieve to obtain lead-free high energy storage ceramic powder;

[0061] (2) Perform secondary ball milling on the calcined powder in step (1); use ...

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Abstract

A kind of lead-free high energy storage density ceramic material and preparation method thereof, first according to chemical formula (1‑x) (0.65BaTiO 3 -0.35Bi 0.5 Na 0.5 TiO 3 )‑xSrY 0.5 Nb 0.5 o 3 Perform batching, where x represents the mole fraction, and 0.06≤x≤0.12; obtain powder after ball milling and drying; add the obtained powder to the binder to granulate, stale for 24 to 48 hours, press into tablets, and debinding After treatment, it is sintered at 1100-1200°C to obtain a lead-free high energy storage density ceramic material. The ceramic material of the invention has a simple and stable preparation process, is suitable for industrial production, and has excellent energy storage properties. Based on the hysteresis loop calculation, the energy storage density of the ceramic material at room temperature can reach 1.0J / cm 3 Above; and under the electric field of 152kV / cm, the energy storage density can reach 1.36J / cm 3 .

Description

technical field [0001] The invention belongs to the field of energy storage ceramics, in particular to a lead-free high energy storage density ceramic material and a preparation method thereof. Background technique [0002] In recent years, with the continuous progress of society and the continuous development of scientific and technological information technology, the energy problem is a very serious problem facing the world. Therefore, how to improve energy utilization and energy storage has become the focus of attention. The rapid and efficient development of advanced energy storage materials will greatly improve the efficiency of terminal energy utilization. At present, the main energy storage devices include traditional batteries, nickel series and lithium series batteries, material fuel cells, supercapacitors and dielectric capacitors, etc. Modern electronic technology requires devices such as capacitors to be lighter and lighter in weight, smaller in size, and higher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622
Inventor 杨海波刘晓钰林营
Owner SHAANXI UNIV OF SCI & TECH
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