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Bismuth strontium titanate-based lead-free ceramic material for efficient capacitor and preparation method of ceramic material

A technology of strontium bismuth titanate and ceramic materials, which can be used in capacitors, fixed capacitors, fixed capacitor dielectrics, etc., can solve problems such as affecting energy storage density, low breakdown strength, and limiting the application of strontium bismuth titanate ceramics.

Active Publication Date: 2021-06-08
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the volatilization of a small amount of Bi element in the sintering process of strontium bismuth titanate ceramics, some oxygen vacancies will be generated, resulting in lower breakdown strength and affecting its energy storage density, which also limits the use of strontium bismuth titanate ceramics in Applications in High Energy Density Capacitors
At present, the energy storage density of most strontium bismuth titanate-based ceramics is still low (3 ), there is still a certain gap compared with traditional lead-based ceramic materials

Method used

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  • Bismuth strontium titanate-based lead-free ceramic material for efficient capacitor and preparation method of ceramic material
  • Bismuth strontium titanate-based lead-free ceramic material for efficient capacitor and preparation method of ceramic material
  • Bismuth strontium titanate-based lead-free ceramic material for efficient capacitor and preparation method of ceramic material

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The chemical composition of strontium bismuth titanate based lead-free ceramics for high-efficiency capacitors is (1-x)Sr 0.7 Bi 0.2 TiO 3 -xBi(Ni 2 / 3 Nb 1 / 3 )O 3 , where x=0, the specific steps are as follows:

[0039] (1) Select Bi with a purity greater than 98% 2 o 3 Powder, SrCO 3 Powder, TiO 2 Powder is the raw material, according to the chemical formula Sr 0.7 Bi 0.2 TiO 3 The raw materials are weighed, and anhydrous ethanol with the same quality as the powder is added, and mixed uniformly through a ball milling process, so that the powder is uniformly mixed to form a slurry. One of the ball mills uses absolute ethanol and ZrO 2 The ball is used as the ball milling medium, the rotating speed is 250r / min, the running direction is adjusted every half hour, and the ball milling time is 12h.

[0040] (2) Bake the above slurry in a constant temperature oven at 90° C., remove absolute ethanol, and grind it in a mortar to obtain a powder;

[0041] (3) Put t...

Embodiment 2

[0047] The chemical composition of strontium bismuth titanate based lead-free ceramics for high-efficiency capacitors is (1-x)Sr 0.7 Bi 0.2 TiO 3 -xBi(Ni 2 / 3 Nb 1 / 3 )O 3 , where x=0.05, the specific steps are as follows:

[0048] (1) Select Bi with a purity greater than 98% 2 o 3 Powder, SrCO 3 Powder, TiO 2 powder, NiO powder and Nb 2 o 5 Powder is the raw material, according to the chemical formula 0.95Sr 0.7 Bi 0.2 TiO 3 -0.05Bi(Ni 2 / 3 Nb 1 / 3 )O 3 The raw materials are weighed, and anhydrous ethanol with the same quality as the powder is added, and mixed uniformly through a ball milling process, so that the powder is uniformly mixed to form a slurry. One of the ball mills uses absolute ethanol and ZrO 2 The ball is used as the ball milling medium, the speed is 290r / min, the running direction is adjusted every half hour, and the ball milling time is 18h.

[0049] (2) Bake the above slurry in a constant temperature oven at 90° C., remove absolute ethanol, an...

Embodiment 3

[0056] The chemical composition of strontium bismuth titanate based lead-free ceramics for high-efficiency capacitors is (1-x)Sr 0.7 Bi 0.2 TiO 3 -xBi(Ni 2 / 3 Nb 1 / 3 )O 3 , where x=0.12, the specific steps are as follows:

[0057] (1) Select Bi with a purity greater than 98% 2 o 3 Powder, SrCO 3 Powder, TiO 2 powder, NiO powder and Nb 2 o 5 Powder is the raw material, according to the chemical formula 0.88Sr 0.7 Bi 0.2 TiO 3 -0.12Bi(Ni 2 / 3 Nb 1 / 3 )O 3 The raw materials are weighed, and anhydrous ethanol with the same quality as the powder is added, and mixed uniformly through a ball milling process, so that the powder is uniformly mixed to form a slurry. One of the ball mills uses absolute ethanol and ZrO 2 The ball is used as the ball milling medium, the rotating speed is 330r / min, the running direction is adjusted every half hour, and the ball milling time is 24h.

[0058] (2) Bake the above slurry in a constant temperature oven at 90° C., remove absolute et...

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Abstract

The invention relates to a bismuth strontium titanate-based lead-free ceramic material for a high-efficiency capacitor and a preparation method of the ceramic material, and belongs to the field of electric energy storage materials. A solid-phase synthesis method is adopted, on the basis of a relaxor ferroelectric material Sr0.7Bi0.2TiO3, Nb and Ni heterovalent elements in a certain molar ratio are doped into the B site of a perovskite structure to increase the charge disorder of the perovskite structure, the novel composite ceramic is obtained, the chemical formula of the novel composite ceramic is (1-x)Sr0.7Bi0.2TiO3-xBi(Ni2 / 3Nb1 / 3)O3, and x is larger than or equal to 0 and smaller than or equal to 0.15. The main performance parameters of the energy storage ceramic material obtained by the invention can recover the energy storage density Wrec which reaches 4.19-5.98 J / cm<3>, and the energy storage efficiency eta reaches up to 92.6-98.6%. The method is simple in technological process, suitable for industrial production and capable of meeting the current lead-free and environment-friendly requirements.

Description

technical field [0001] The invention relates to the technical field of functional materials and devices, in particular to a strontium bismuth titanate-based lead-free ceramic material for high-efficiency capacitors and a preparation method thereof. Background technique [0002] At present, the main electrical energy storage devices include batteries, dielectric capacitors, and electrochemical capacitors. These energy storage devices have obvious differences in energy density and power density, which are caused by their different energy storage mechanisms and charging and discharging processes. Compared with other energy storage devices, dielectric capacitors can release electrical energy in a very short period of time (nanoseconds to microseconds) and generate huge pulse currents or voltages, which also makes dielectric capacitors in There is a huge potential for applications in pulsed power electronic systems. Moreover, unlike electrochemical capacitors and batteries, die...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622C04B35/638H01G4/12
CPCC04B35/47C04B35/622C04B35/638H01G4/1227C04B2235/3298C04B2235/3279C04B2235/3251C04B2235/602C04B2235/6562C04B2235/6567C04B2235/661Y02E60/13
Inventor 白王峰丁昱钦贺金涛阙文俊郑鹏
Owner HANGZHOU DIANZI UNIV
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