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High-energy storage density barium strontium titanate-based leadless relaxor ferroelectric ceramic and preparation method thereof

A technology of ferroelectric ceramics and barium strontium titanate, which is applied in the field of functional ceramics, can solve the problems of low energy storage density and bulky energy storage devices, and achieve high energy storage density, high energy storage efficiency, and low production costs

Active Publication Date: 2019-01-11
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the energy storage density of commonly used dielectric capacitors is low, which leads to bulky energy storage devices, accounting for about 40% to 60% of the entire device volume

Method used

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  • High-energy storage density barium strontium titanate-based leadless relaxor ferroelectric ceramic and preparation method thereof
  • High-energy storage density barium strontium titanate-based leadless relaxor ferroelectric ceramic and preparation method thereof
  • High-energy storage density barium strontium titanate-based leadless relaxor ferroelectric ceramic and preparation method thereof

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preparation example Construction

[0030] The invention relates to a lead-free relaxor ferroelectric ceramic based on strontium barium titanate with high energy storage density and a preparation method thereof. The composition of ceramic material of the present invention is: (1-x) (Ba 0.55 Sr 0.45 )TiO 3 -xBi(Mg 2 / 3 Nb 1 / 3 )O 3 , wherein, 03 and SrTiO 3 , or BaCO 3 , SrCO 3 and TiO 2 ) press (Ba 0.55 Sr 0.45 )TiO 3 Stoichiometric proportioning, drying and briquetting, synthesis at 1100-1200°C for 2-6 hours to obtain BST ceramic powder; Bi source, Mg source, Nb source (such as Bi 2 o 3 , MgO, Nb 2 o 5 ) and BST ceramic powder according to (1-x)(Ba 0.55 Sr 0.45 )TiO 3 -xBi(Mg 2 / 3 Nb 1 / 3 )O 3 (03 , the energy storage efficiency can be more than 80%, compared with (Ba 0.55 Sr 0.45 )TiO 3 Compared with ceramics, the effective energy storage density is increased by 2.85J / cm 3 , the improvement rate is as high as 167.6%, and the energy storage efficiency is increased by 25.1%. here. "Effectiv...

Embodiment 1

[0050] The composition of the material is

[0051] 0.95 (Ba 0.55 Sr 0.45 )TiO 3 -0.05Bi(Mg 2 / 3 Nb 1 / 3 )O 3

[0052] (1) with BaTiO 3 , SrTiO 3 Powder as raw material, according to (Ba 0.55 Sr 0.45 )TiO 3 Stoichiometric ratio preparation, mixed by wet ball milling, according to the mass ratio ball milling of raw materials: ball: deionized water=1:4.5:1.7 and ball milling for 24 hours, after drying, cross 40 mesh sieves, press large pieces under 5MPa pressure, Rise to 1150°C at a heating rate of 2°C / min, keep the temperature for 4 hours, and synthesize (Ba 0.55 Sr 0.45 )TiO 3 Powder;

[0053] (2) Grind the powder obtained in step (1), pass through a 40-mesh sieve, and then mix with Bi 2 o 3 , MgO, Nb 2 o 5 and other raw materials according to 0.95 (Ba 0.55 Sr 0.45 )TiO 3 -0.05Bi(Mg 2 / 3 Nb 1 / 3 )O 3 Stoichiometric ratio preparation, according to the mass ratio of raw materials: balls: deionized water = 1:5:1.55, mixed for 24 hours, after drying, passed thro...

Embodiment 2

[0060] The composition of the material is

[0061] 0.93 (Ba 0.55 Sr 0.45 )TiO 3 -0.07Bi(Mg 2 / 3 Nb 1 / 3 )O 3

[0062] (1) with BaTiO 3 , SrTiO 3 Powder as raw material, according to (Ba 0.55 Sr 0.45 )TiO 3 Stoichiometric ratio preparation, mixed by wet ball milling, according to the mass ratio ball milling of raw materials: ball: deionized water=1:4.5:1.7 and ball milling for 24 hours, after drying, cross 40 mesh sieves, press large pieces under 5MPa pressure, Rise to 1150°C at a heating rate of 2°C / min, keep the temperature for 4 hours, and synthesize (Ba 0.55 Sr 0.45 )TiO 3 Powder;

[0063] (2) Grind the powder obtained in step (1), pass through a 40-mesh sieve, and then mix with Bi 2 o 3 , MgO, Nb 2 o 5 and other raw materials according to 0.93 (Ba 0.55 Sr 0.45 )TiO 3 -0.07Bi(Mg 2 / 3 Nb 1 / 3 )O 3 Stoichiometric ratio preparation, according to the mass ratio of raw materials: balls: deionized water = 1:5:1.55, mixed for 24 hours, after drying, passed thro...

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Abstract

The invention relates to a high-energy storage density barium strontium titanate-based leadless relaxor ferroelectric ceramic and a preparation method thereof. The chemical formula of the barium strontium titanate-based leadless relaxor ferroelectric ceramic is (1-x)(Ba0.55Sr0.45)TiO3-xBi(Mg2 / 3Nb1 / 3)O3, wherein x is more than 0 and not more than 0.15.

Description

technical field [0001] The invention relates to a lead-free energy storage ceramic material, in particular to a high energy storage density strontium barium titanate-based lead-free relaxor ferroelectric ceramic and a preparation method thereof, belonging to the field of functional ceramics. Background technique [0002] With the continuous development of science and technology, the application field of pulse power technology is becoming wider and wider. Pulse power technology stores energy at a slow speed by means of a low-power power supply, and then compresses the energy into high-power pulses through a pulse power system, so that it can be released in a short period of time (up to nanoseconds). on a specific load. Since pulsed power technology has always been constrained by energy storage technology, electrical energy storage materials have received more and more attention in recent years. Energy storage materials cover a wide range, including fuel cells, lithium-ion b...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/468C04B35/622C04B2235/3206C04B2235/3213C04B2235/3251C04B2235/3298
Inventor 董显林黄伟陈莹
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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