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Lead-free high-energy-density ceramic material and preparation method thereof

A technology of high energy storage density and ceramic materials, applied in the field of lead-free high energy storage density ceramic materials and their preparation, can solve the problems of hindering practical application fields, low energy storage density, low maximum saturation polarization intensity, etc. It is beneficial to mass production, the preparation process is simple, and the effect is easy to obtain

Active Publication Date: 2022-02-01
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing relaxor ferroelectric energy storage material systems have the problems of low maximum saturation polarization strength and medium dielectric breakdown field strength, resulting in low energy storage density, which seriously hinders its practical application field.

Method used

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  • Lead-free high-energy-density ceramic material and preparation method thereof
  • Lead-free high-energy-density ceramic material and preparation method thereof
  • Lead-free high-energy-density ceramic material and preparation method thereof

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preparation example Construction

[0045] Specifically, the preparation method of the lead-free high energy storage density ceramic material of this embodiment is described, please refer to figure 1 , figure 1 It is a schematic flow chart of a preparation method of a lead-free high energy storage density ceramic material provided by the embodiment of the present invention. As shown in the figure, the preparation method of the lead-free high energy storage density ceramic material of this embodiment includes:

[0046] Step 1: According to (1-x)[(1-y)BaTiO 3 -yBi(M'M")O 3 ]-xBi 0.5 Na 0.5 TiO 3 In the stoichiometric ratio, mix Ba-containing compound, Ti-containing compound, Bi-containing compound, Na-containing compound, M'-containing compound and M"-containing compound to obtain a mixed material, wherein, 0.1≤x≤0.5, 0.03≤y≤0.4 , M' is Zn, Mg, Li or Ni, M "is Hf, Ta, Nb or Ti;

[0047] In this embodiment, optionally, the Ba-containing compound is selected from BaCO 3 Powder, its purity is 99.8%, the compou...

Embodiment 1

[0078] The chemical formula is 0.9[0.9BaTiO 3 -0.1Bi(Zn 0.25 Ta 0.5 )O 3 ]-0.1Bi 0.5 Na 0.5 TiO 3 preparation of ceramic materials.

[0079] Step (1): According to 0.9[0.9BaTiO 3 -0.1Bi(Zn 0.25 Ta 0.5 )O 3 ]-0.1Bi 0.5 Na 0.5 TiO 3 The molar stoichiometric ratio of the raw material BaCO was weighed 3 、TiO 2 、 Ta 2 o 5 , ZnO, Bi 2 o 3 and NaCO 3 get mixed material;

[0080] Step (2): Using absolute ethanol as a grinding aid, dioctyl phthalate (DOP) as a dispersant, and using zirconia balls of two sizes as a ball milling medium, the mixed material obtained through step (1) For ball milling, the dosage of absolute ethanol is: add 0.8ml of absolute ethanol per gram of powder to be milled, the mass ratio of zirconium balls to powder is 2:1, the ball milling time is 16h, and the ball milling speed is 350r / min;

[0081] Step (3): The uniform mixed powder obtained in step (2) is placed in an oven for drying treatment to obtain a mixed dry powder. The drying tempera...

Embodiment 2

[0097] The chemical formula is 0.8[0.9BaTiO 3 -0.1Bi(Zn 0.25 Ta 0.5 )O 3 ]-0.2Bi 0.5 Na 0.5 TiO 3 The preparation of the ceramic material, wherein, the sintering temperature is 1220 ° C, the rest of the preparation process is the same as in Example 1, recorded as 0.8 (0.9BT-0.1BZT)-0.2BNT.

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Abstract

The invention relates to a lead-free high-energy-density ceramic material and a preparation method thereof, the chemical formula of the lead-free high-energy-density ceramic material is (1-x) [(1-y) BaTiO3-yBi (M'M'') O3]-xBi0. 5Na0. 5TiO3, 0.1 < = x < = 0.5, 0.03 < = y < = 0.4, M' is Zn, Mg, Li or Ni, and M'' is Hf, Ta, Nb or Ti. According to the lead-free high-energy-density ceramic material, BNT with large saturation polarization intensity serves as a third component, solid solution is conducted on the BNT and the relaxor ferroelectric BaTiO3-Bi (M'M'') O3, a BT-BM'M''-BNT system is obtained, the saturation polarization intensity of the lead-free high-energy-density ceramic material is remarkably improved, and the lead-free high-energy-density ceramic material still keeps extremely low remanent polarization intensity, and great energy storage density can be obtained under extremely low field intensity.

Description

technical field [0001] The invention belongs to the field of dielectric energy storage ceramic materials, in particular to a lead-free high energy storage density ceramic material and a preparation method thereof. Background technique [0002] With the continuous development of new renewable energy storage and utilization and electronic information technology, energy storage dielectric materials play an increasingly important role in various electronic and power systems. Due to its high power density (ultra-fast charge and discharge rate), dielectric energy storage capacitors can generate a large amount of electric energy in a very short time, high cycle life and safety, and are widely used in nuclear physics technology, medical surgical laser , directed energy weapons and other fields, becoming one of the key components in the pulse power system. With the development of power electronic device systems towards miniaturization, light weight and integration, the existing ener...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622C04B2235/3201C04B2235/3215C04B2235/3232C04B2235/3251C04B2235/3284C04B2235/3298C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567C04B2235/6562
Inventor 闫养希覃文杰李智敏张东岩张茂林靳立郝跃
Owner XIDIAN UNIV
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