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A kind of environment-friendly lead-free ceramic material with high energy storage performance and preparation method thereof

A lead-free ceramic and high energy storage technology, applied in the field of energy storage ceramics, can solve the problems of environmental and human health hazards, limited practical application, low energy storage density, etc., to achieve improved energy storage performance, excellent energy storage density and efficiency , the effect of improving the relaxation properties

Active Publication Date: 2022-03-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, although most of the linear dielectrics have high dielectric breakdown strength and energy storage efficiency, their extremely small polarization strength leads to too small energy storage density, which limits its practical application; antiferrodielectrics among the three dielectric materials Due to its double hysteresis loop, it has a large energy storage density, but most of the antiferroelectric dielectrics contain lead elements, and the toxicity of lead is very harmful to the environment and human health. Therefore, people have made Many efforts have been made to explore lead-free materials to circumvent this problem, including the study of ferroelectrics based on barium titanate and sodium bismuth titanate, but their small energy storage density caused by their low dielectric breakdown strength limits their use in Practical applications in pulsed power systems, so improving its energy storage performance by enhancing dielectric breakdown strength has become a hot spot at this stage

Method used

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  • A kind of environment-friendly lead-free ceramic material with high energy storage performance and preparation method thereof
  • A kind of environment-friendly lead-free ceramic material with high energy storage performance and preparation method thereof
  • A kind of environment-friendly lead-free ceramic material with high energy storage performance and preparation method thereof

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preparation example Construction

[0052] The preparation method of the environment-friendly high energy storage performance lead-free ceramic material of the present invention comprises the following steps:

[0053] (1) According to the chemical formula (1-x) BaTiO 3 -xK 0.73 Bi 0.09 NbO 3 Analytically pure BaCO 3 , TiO 2 , K 2 CO 3 , Bi 2 O 3 and Nb 2 O 5 The ingredients, where x represents the mole fraction, and 0.02≤x≤0.12, take absolute ethanol as the medium, mix them uniformly by ball milling for 20-24 hours, then dry at 100°C, pass through a 120-mesh sieve, briquette, and then pass 900 Pre-sintering at ~950°C for 3-5 hours to obtain bulk solids, and then pulverizing the massive solids and passing through a 120-mesh sieve to obtain calcined powders;

[0054] (2) using absolute ethanol as a medium for the pre-fired powder obtained in step (1), ball-milling for 20 to 24 hours, then drying at 100° C., and passing through a 120-mesh sieve to obtain raw material powder;

[0055] (3) cold isostatic ...

Embodiment 1

[0065] The chemical formula of the ceramic material in this example is: (1-x)BaTiO 3 -xK 0.73 Bi 0.09 NbO 3 , where x represents the mole fraction, and x=0.02.

[0066] The preparation method of the above-mentioned environmentally friendly high energy storage performance lead-free ceramic material comprises the following steps:

[0067] (1) According to the chemical formula (1-x) BaTiO 3 -xK 0.73 Bi 0.09 NbO 3 Analytically pure BaCO 3 , TiO 2 , K 2 CO 3 , Bi 2 O 3 and Nb 2 O 5 Ingredients, where x represents the mole fraction, and x=0.02, with absolute ethanol as the medium, mixed uniformly by ball milling for 20 hours, then dried at 100 ° C, passed through a 120-mesh sieve, briqueted, and then pre-fired at 950 ° C for 2 120 mesh sieves to obtain calcined powder;

[0068] (2) the calcined powder of step (1) gained is used dehydrated alcohol as a medium, ball-milled for 24 hours,

[0069] Then dry at 100°C and pass through a 120-mesh sieve to obtain raw materia...

Embodiment 2

[0075] The chemical formula of the ceramic material in this example is: (1-x)BaTiO 3 -xK 0.73 Bi 0.09 NbO 3 , where x represents the mole fraction, and x=0.04.

[0076] The preparation method of the above-mentioned environmentally friendly high energy storage performance lead-free ceramic material comprises the following steps:

[0077] (1) According to the chemical formula (1-x) BaTiO 3 -xK 0.73 Bi 0.09 NbO 3 Analytically pure BaCO 3 , TiO 2 , K 2 CO 3 , Bi 2 O 3 and Nb 2 O 5 Ingredients, where x represents the mole fraction, and x=0.04, with absolute ethanol as the medium, mixed uniformly by ball milling for 22 hours, then dried at 100 ° C, passed through a 120-mesh sieve, pressed into pieces, and then pre-fired at 920 ° C for 4 120 mesh sieves to obtain calcined powder;

[0078](2) using absolute ethanol as a medium for the pre-fired powder obtained in step (1), ball-milling for 22 hours, then drying at 100 ° C, and passing through a 120-mesh sieve to obtain...

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Abstract

The invention provides an environment-friendly lead-free ceramic material with high energy storage performance and a preparation method thereof. The chemical formula of the environment-friendly lead-free ceramic material with high energy storage performance is: (1‑x)BaTiO 3 ‑xK 0.73 Bi 0.09 NbO 3 , where 0.02≤x≤0.12. Including the following steps: (1) BaCO 3 、TiO 2 、K 2 CO 3 、 Bi 2 o 3 and Nb 2 o 5 Mix evenly to obtain raw material powder, briquetting and calcining to obtain block solid, then crush and sieve the block solid to obtain calcined powder; (2) obtain calcined powder obtained in step (1) by ball milling raw material powder; (3) pressing the raw material powder obtained in step (2) into tablets, and then sintering it into porcelain to obtain an environment-friendly lead-free ceramic material with high energy storage performance. This ceramic material has high dielectric breakdown strength and energy storage density, and has the characteristics of environmental friendliness and high practicability.

Description

technical field [0001] The invention belongs to the field of energy storage ceramics, in particular to an environment-friendly lead-free ceramic material with high energy storage performance and a preparation method thereof. Background technique [0002] In recent years, due to the continuous consumption of non-renewable resources and the increasingly serious environmental pollution, renewable and environmentally friendly energy materials have attracted more and more attention. Ceramic capacitors have broad application prospects in pulsed power systems due to their fast charging and discharging speed, large dielectric constant, wide application temperature range, and long service life. It is a key material for high-capacity and high-efficiency capacitors. It is widely used in many fields such as communications, electronics, automobiles, and military due to its advantages of high energy storage density, high mechanical strength, suitable for extreme environments such as high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622C04B2235/3201C04B2235/3251C04B2235/3298C04B2235/656C04B2235/6567C04B2235/96
Inventor 杨海波李达林营张苗
Owner SHAANXI UNIV OF SCI & TECH
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