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

A high energy storage density, ceramic material technology, applied in the field of energy storage ceramics, can solve the problems of unstable dielectric constant temperature and frequency changes, limited application range, high dielectric constant, etc., to achieve good frequency stability, Excellent energy storage density and simple preparation process

Active Publication Date: 2020-04-07
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most antiferroelectric materials contain lead, which has a large proportion of lead, which is highly toxic and will cause serious pollution to the human body and the environment. Therefore, people are working on 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 is relatively low, resulting in its Severely limited range of use
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

[0046] The preparation method of the lead-free high energy storage density ceramic material of the present invention comprises the following steps:

[0047] (1) According to the chemical formula Bi 0.48 La 0.02 Na 0.48 Li 0.02 Ti 0.98 Zr 0.02 o 3 Analytical pure Bi 2 o 3 , La 2 o 3 、Na 2 CO 3 , Li 2 CO 3 、TiO 2 , ZrO 2 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 750-850°C for 3-5 hours to obtain blocks shape solid, then crush the massive solid and pass through a 120-mesh sieve to obtain Bi 0.48 La 0.02 Na 0.48 Li 0.02 Ti 0.98 Zr 0.02 o 3 Powder;

[0048] (2) According to the chemical formula Na 0.73 Bi 0.09 NbO 3 will analyze pure Na 2 CO 3 、 Bi 2 o 3 , 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 si...

Embodiment 1

[0060] The chemical formula of the ceramic material in this example is: (1-x)Bi 0.48 La 0.02 Na 0.48 Li 0.02 Ti 0.98 Zr 0.02 o 3 -xNa 0.73 Bi 0.09 NbO 3 , where x represents the mole fraction, and x=0.06.

[0061] The preparation method of the above-mentioned lead-free high energy storage density ceramic material comprises the following steps:

[0062] (1) According to the chemical formula Bi 0.48 La 0.02 Na 0.48 Li 0.02 Ti 0.98 Zr 0.02 o 3 Analytical pure Bi 2 o 3 , La 2 o 3 、Na 2 CO 3 , Li 2 CO 3 、TiO 2 , ZrO 2 After batching, use absolute ethanol as the medium, mix evenly through 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 the block 120-mesh sieve after crushing the solid to obtain Bi 0.48 La 0.02 Na 0.48 Li 0.02 Ti 0.98 Zr 0.02 o 3 Powder;

[0063] (2) According to the chemical formula Na 0.73 Bi 0.09 NbO 3 will analyze pur...

Embodiment 2

[0070] The chemical formula of the ceramic material in this example is: (1-x)Bi 0.48 La 0.02 Na 0.48 Li 0.02 Ti 0.98 Zr 0.02 o 3 -xNa 0.73 Bi 0.09 NbO 3 , wherein x represents the mole fraction, and x=0.08.

[0071] The preparation method of the above-mentioned lead-free high energy storage density ceramic material comprises the following steps:

[0072] (1) According to the chemical formula Bi 0.48 La 0.02 Na 0.48 Li 0.02 Ti 0.98 Zr 0.02 o 3 Analytical pure Bi 2 o 3 , La 2 o 3 、Na 2 CO 3 , Li 2 CO 3 、TiO 2 , ZrO 2 After batching, use absolute ethanol as the medium, mix evenly by ball milling for 22 hours, then dry at 100°C, pass through a 120-mesh sieve, briquette, and pre-calcine at 820°C for 4 hours to obtain a block solid, and then the block 120-mesh sieve after crushing the solid to obtain Bi 0.48 La 0.02 Na 0.48 Li 0.02 Ti 0.98 Zr 0.02 o 3 Powder;

[0073] (2) According to the chemical formula Na 0.73 Bi 0.09 NbO 3 will analyze pure N...

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Abstract

A lead-free high-energy-storage-density ceramic material and a preparation method of same. The preparation method includes the following steps: 1) preparing raw materials according to the chemical formula (1-x)Bi<0.48>La<0.02>Na<0.48>Li<0.02>Ti<0.98>Zr<0.02>O<3>-xNa<0.73>Bi<0.09>NbO3, wherein x refers to molar fraction, 0.06 <= x <= 0.12; 2) performing ball-milling and drying to obtain a powder; 3) adding a binder to the powder for granulation, and aging the granules for 24-48 h, pressing the granules into sheets, performing glue removal treatment, and sintering the mixture at 1100-1200 DEG C to obtain the lead-free high-energy-storage-density ceramic material. The preparation method is simple and stable and is suitable for industrial production. The ceramic material has high energy-storage performance, is more than 2 J / cm<3> in energy storage density calculated on the basis of ferroelectric hysteresis loop at room temperature and reaches 1.66 J / cm<3> in energy storage density at 90 DEG C under electric field of 140 kV / cm.

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 development of information technology, high-energy-storage-density dielectric materials are key materials for making small, large-capacity, and high-efficiency capacitors, and they play an increasingly important role in various electronic and power systems. Because the high energy storage density ceramic dielectric capacitor material has the advantages of high energy storage density, fast charge and discharge speed, anti-cycle aging, high mechanical strength, suitable for extreme environments such as high temperature and high pressure, and stable performance, it meets the requirements of new energy development and utilization. It is widely used in many modern fields such as communication, computer, automobile, elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G4/12C04B35/49C04B35/622
CPCC04B35/475C04B35/49C04B35/622C04B2235/3201C04B2235/3203C04B2235/3227C04B2235/3255C04B2235/3298C04B2235/656C04B2235/96
Inventor 杨海波闫非林营高淑雅朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH
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