Novel high-energy-storage and high-efficiency sodium niobate-based ceramic material and preparation method thereof

A ceramic material and sodium niobate-based technology, applied in the field of sodium niobate-based ceramic materials and their preparation, can solve problems such as harming human health and the environment, and achieve increased energy storage density, maximum polarization strength and breakdown field. strong effect

Active Publication Date: 2021-01-05
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lead is a harmful element that ser...

Method used

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  • Novel high-energy-storage and high-efficiency sodium niobate-based ceramic material and preparation method thereof
  • Novel high-energy-storage and high-efficiency sodium niobate-based ceramic material and preparation method thereof
  • Novel high-energy-storage and high-efficiency sodium niobate-based ceramic material and preparation method thereof

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preparation example Construction

[0038] The present invention also proposes a method for preparing a sodium niobate-based ceramic material, including the novel high-energy-storage, high-efficiency sodium niobate-based ceramic material, and also includes the following steps:

[0039] S101 uses high-purity powder Na 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 , MgO, Ta 2 o 5 , SrCO 3 and TiO 2 Preparation of sodium niobate-based ceramic powder as raw material;

[0040] S102 Put the sodium niobate-based ceramic powder into a ball mill tank for predetermined treatment, and press the product into a green body for pre-sintering;

[0041] S103 After the pre-burning is completed, the product is poured into a ball mill tank for predetermined treatment again, and the powder is pressed into a disc with a mold after completion;

[0042] S104 The sodium niobate-based ceramic material can be prepared by sintering the disc in a muffle furnace according to the sintering conditions.

[0043] Further, the high-purity powder Na 2 ...

specific Embodiment 1

[0059] Prepare high-purity powder Na with purity ≥ 99% 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 , MgO, Ta 2 o 5 , SrCO 3 and TiO 2 as raw material,

[0060] Na, which will be weighed stoichiometrically 2 CO 3 , Nb 2 o 5 Mixed, pre-fired and kept warm to obtain 0.9 mole percent NaNbO 3 main crystal phase;

[0061] Bi will be weighed stoichiometrically 2 o 3 , MgO, Ta 2 o 5 Mixed, pre-fired and kept warm to obtain 0.1 mole percent Bi(Mg 2 / 3 Ta 1 / 3 )O 3 main crystal phase;

[0062] Bi will be weighed stoichiometrically 2 o 3 、Na 2 CO 3 , SrCO 3 、TiO 2 Mix, make 0 mole percent (Bi 0.5 Na 0.5 ) 0.7 Sr 0.3 TiO 3 main crystal phase;

[0063] NaNbO will be weighed stoichiometrically 3 , Bi(Mg 2 / 3 Ta 1 / 3 )O 3 Mixed, pre-fired and kept warm to obtain 0.9NaNbO 3 -0.1Bi(Mg 2 / 3 Ta 1 / 3 )O 3 main crystal phase;

[0064] 0.9NaNbO weighed according to the stoichiometric ratio 3 -0.1Bi(Mg 2 / 3 Ta 1 / 3 )O 3 , 0 mole percent (Bi 0.5 Na 0.5 ) 0.7 Sr 0.3 TiO 3 M...

specific Embodiment 2

[0067] According to the composition formula of the prepared sodium niobate-based ceramic powder is (0.9)[0.9NaNbO 3 -0.1Bi(Mg 2 / 3 Ta 1 / 3 )O 3 ]-0.1mol% (Bi 0.5 Na 0.5 ) 0.7 Sr 0.3 TiO 3 Weigh each high-purity powder, and the rest of the steps are the same as in Example 1.

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Abstract

The invention discloses a novel high-energy-storage and high-efficiency sodium niobate-based ceramic material of which the composition formula is (1x)[0.9 NaNbO3-0.1Bi(Mg2/3Ta1/3)O3]x(Bi0.5Na0.5)0.7Sr0.3TiO3, x is the molar percentage, and x is more than or equal to 0 and less than or equal to 0.40. The invention also discloses a preparation method of the sodium niobate-based ceramic material, which includes the novel high-energy storage and high-efficiency sodium niobate-based ceramic material, and further comprises the following steps: preparing sodium niobate-based ceramic powder; putting the sodium niobate-based ceramic powder into a ball milling tank for predetermined treatment, and pressing a product into a green body for presintering; pouring a product into the ball-milling tank after pre-sintering is completed, carrying out predetermined treatment again, and pressing the powder into a wafer by using a mold after pre-sintering is completed; sintering the wafer in a muffle furnace according to sintering conditions to prepare the sodium niobate-based ceramic material, and introducing strong ferroelectric Bi(Mg2/3Ta1/3)O3 and (Bi0.5Na0.5)0.7 Sr0.3TiO3 to form a uniform solid solution with NaNbO3 antiferroelectric so that the maximum polarization strength and breakdown field strength of the ceramic material are improved, wherein the energy storage density of the dielectric ceramic material is improved.

Description

technical field [0001] The invention relates to the technical field of energy storage of dielectric ceramic materials, in particular to a novel high-energy-storage, high-efficiency sodium niobate-based ceramic material and a preparation method thereof. Background technique [0002] In recent years, dielectric capacitors for electrical energy storage have been extensively studied for their ultrahigh power density due to their ultrafast charge / discharge rates compared with fuel cells and lithium-ion batteries. In general, large saturation polarization, high breakdown strength, and low remnant polarization are crucial to achieve high energy storage density. Currently, there are four representative dielectric materials for energy storage applications: linear dielectrics, ferroelectrics, relaxor ferroelectrics, and antiferroelectrics. Linear dielectric materials usually have high breakdown strength and small low remnant polarization, but the low large saturation polarization lim...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/64B28B3/00
CPCC04B35/495C04B35/64B28B3/00C04B2235/3201C04B2235/3251C04B2235/3298C04B2235/3206C04B2235/3213C04B2235/3232Y02E60/13
Inventor 陈秀丽史军彭周焕福张海林
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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