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Preparation method of high-performance potassium-sodium niobate-based lead-free energy storage ceramic

A potassium-sodium niobate-based, high-performance technology, applied in fixed capacitor parts, fixed capacitor dielectrics, circuits, etc., can solve the problems of few researches on the characteristics of electric energy storage

Inactive Publication Date: 2021-01-26
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research content mainly focuses on energy conversion, including piezoelectric effect, electro-optical effect, and electric card effect, but there are few studies on its electrical energy storage characteristics.

Method used

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  • Preparation method of high-performance potassium-sodium niobate-based lead-free energy storage ceramic
  • Preparation method of high-performance potassium-sodium niobate-based lead-free energy storage ceramic
  • Preparation method of high-performance potassium-sodium niobate-based lead-free energy storage ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Ceramic powder ball milled for 8 hours and KNN-based energy storage ceramics using a two-stage sintering method, the general chemical formula is 0.925 (K 0.5 Na 0.5 )NbO 3 –0.075Bi(Zn 2 / 3 (Ta 0.5 Nb 0.5 ) 1 / 3 )O 3 .

[0030] The specific preparation process of Example 1 includes the following steps.

[0031] (1) Weigh the raw materials according to the stoichiometric ratio of the general chemical formula, add them together with zirconia balls and absolute ethanol into a nylon ball mill jar, and place them on a planetary ball mill for ball milling and mixing for 12 hours.

[0032] (2) After drying the ball-milled mixture, place it in a muffle furnace for calcination at 850°C for 5 hours.

[0033] (3) After the pre-fired powder is ball milled for 8 hours and dried again, add an appropriate amount of polyvinyl alcohol binder for grinding and granulation, and unidirectional pressure molding at 2MPa to obtain a ceramic with a diameter of about 8mm and a thi...

Embodiment 2

[0036] Example 2 KNN-based energy storage ceramics with ceramic powder ball milled for 14 hours and two-stage sintering method, the general chemical formula is 0.925 (K 0.5 Na 0.5 )NbO 3 –0.075Bi(Zn 2 / 3 (Ta 0.5 Nb 0.5 ) 1 / 3 )O 3 .

[0037] The specific preparation process of Example 1 includes the following steps.

[0038] (1) Weigh the raw materials according to the stoichiometric ratio of the general chemical formula, add them together with zirconia balls and absolute ethanol into a nylon ball mill jar, and place them on a planetary ball mill for ball milling and mixing for 12 hours.

[0039] (2) After drying the ball-milled mixture, place it in a muffle furnace for calcination at 850°C for 5 hours.

[0040] (3) After the pre-fired powder is ball milled for 14 hours to dry again, add an appropriate amount of polyvinyl alcohol binder for grinding and granulation, and unidirectional pressure molding at 2MPa to obtain a ceramic with a diameter of about 8mm and a thickne...

Embodiment 3

[0043] Example 3 KNN-based energy storage ceramics with ceramic powder ball milled for 20 hours and two-stage sintering method, the general chemical formula is 0.925 (K 0.5 Na 0.5 )NbO 3 –0.075Bi(Zn 2 / 3 (Ta 0.5 Nb 0.5 ) 1 / 3 )O 3 .

[0044] The specific preparation process of Example 3 includes the following steps.

[0045] (1) Weigh the raw materials according to the stoichiometric ratio of the general chemical formula, add them together with zirconia balls and absolute ethanol into a nylon ball mill jar, and place them on a planetary ball mill for ball milling and mixing for 12 hours.

[0046] (2) After drying the ball-milled mixture, place it in a muffle furnace for calcination at 850°C for 5 hours.

[0047] (3) (3) After the calcined powder is ball milled for 20 hours and dried again, add an appropriate amount of polyvinyl alcohol binder for grinding and granulation, and unidirectional pressure molding at 2MPa to obtain a diameter of about 8mm and a thickness of abo...

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Abstract

The invention belongs to the field of dielectric capacitor materials, and particularly relates to a preparation method of high-performance potassium-sodium niobate-based lead-free energy storage capacitor ceramic. The potassium-sodium niobate-based ceramic powder is obtained from industrial raw materials through a solid-phase method, a ceramic sample is obtained through unique two-stage sintering,and the energy storage density of the sample is obtained through ferroelectric hysteresis loop testing and calculation. Firstly, the ball milling time of ceramic powder and the two-stage sintering schedule of a green body are adjusted, and then the effective energy storage density and efficiency of the ceramic powder are obtained through ferroelectric analysis. The preparation method of the potassium-sodium niobate-based energy storage ceramic material is simple, convenient and capable of effectively obtaining high energy storage density and efficiency, and has reference significance for preparation of energy storage ceramic materials of other systems.

Description

technical field [0001] The invention belongs to the field of dielectric capacitor materials, and in particular relates to a preparation method of high-performance potassium sodium niobate-based lead-free energy storage capacitor ceramics. Background technique [0002] Dielectric capacitors store energy by polarizing the dielectric so that the surface of the electrode is enriched with charges to form an electric field. Because the establishment of this energy mode does not go through the diffusion of substances and chemical reactions, its charging and discharging process is extremely fast, reaching the level of microseconds or even nanoseconds. In addition, dielectric capacitors have a high cycle life. At the same time, if a solid dielectric is used, it can be made into an all-solid structure. Compared with electrochemical capacitors and batteries, there will be no danger of leakage, fire or even explosion, and it is safer. reliable. High power capacitors made of dielectric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/638H01G4/12
CPCC04B35/495C04B35/622C04B35/638H01G4/1254C04B2235/3201C04B2235/3284C04B2235/3298C04B2235/6562C04B2235/6565C04B2235/6567
Inventor 郇宇王晓智魏涛
Owner UNIV OF JINAN
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