Stoichiometric mismatched high-energy-storage silver niobate-based ceramic and preparation method thereof

A silver niobate-based, stoichiometric technology, applied in the field of functional ceramic materials, can solve the problems of large doping amount, unfavorable cost, and low energy storage density of pure AN ceramics, achieving high energy storage density and saving raw material costs

Active Publication Date: 2021-08-06
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy storage density of pure AN ceramics is low. At present, the antiferroelectricity of AN-based ceramics is generally improved by doping modification, thereby improving the energy storage performance.
However, doping modification requires the introduction of other ions, and requires a slightly larger doping amount, resulting in waste of raw materials, which is not conducive to saving costs

Method used

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  • Stoichiometric mismatched high-energy-storage silver niobate-based ceramic and preparation method thereof
  • Stoichiometric mismatched high-energy-storage silver niobate-based ceramic and preparation method thereof
  • Stoichiometric mismatched high-energy-storage silver niobate-based ceramic and preparation method thereof

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Embodiment 1

[0027] This embodiment provides a high-energy-storage silver niobate-based lead-free ceramic with a stoichiometric mismatch and a preparation method thereof. The molecular formula of the high-energy-storage silver-niobate-based lead-free antiferroelectric ceramic is Ag 0.985 La 0.005 Nb 0.97 o 2.925 (Ag 0.985 La 0.005 Nb 1-x o 3-2.5x ; x=0.03).

[0028] Preparation of Ag 0.985 La 0.005 Nb 0.97 o 2.925 (Ag 0.985 La 0.005 Nb 1-x o 3-2.5x ; x=0.03) The ceramic method is as follows:

[0029] Weigh high-purity Ag 2 O powder 3.4343g, high purity Nb 2 o 5 Powder 3.8679g, high purity La 2 o 3 The powder is 0.0244g, and the weighed powder is mixed and ball milled for 24 hours. The ball milling speed is selected as 300 rpm. The powder is fully manually ground for 40 minutes, and then pressed into an embryo body with a diameter of 20mm using a pressure of 52Mpa. The embryo body is placed in oxygen and pre-fired at 890°C for 6 hours, and the heating and cooling rates a...

Embodiment 2

[0031] This embodiment provides a high-energy-storage silver niobate-based lead-free ceramic with a stoichiometric mismatch and a preparation method thereof. The molecular formula of the high-energy-storage silver-niobate-based lead-free antiferroelectric ceramic is Ag 0.985 La 0.005 Nb 0.94 o 2.85 (Ag 0.985 La 0.005 Nb 1-x o 3-2.5x ; x=0.06).

[0032] Preparation of Ag 0.985 La 0.005 Nb 0.94 o 2.85 (Ag 0.985 La 0.005 Nb 1-x o 3-2.5x ; x=0.06) the method of ceramics is: take high-purity Ag 2 O powder 3.4343g, high purity Nb 2 o 5 Powder 3.7483g, high purity La 2 o 3The powder is 0.0244g, and the weighed powder is mixed and ball milled for 24 hours. The ball milling speed is selected as 300 rpm. The powder is fully manually ground for 40 minutes, and then pressed into an embryo body with a diameter of 20mm under a pressure of 47Mpa. The embryo body is placed in oxygen and pre-fired at 890°C for 6 hours, and the heating and cooling rates are both 5°C / min. Gri...

Embodiment 3

[0034] This embodiment provides a high-energy-storage silver niobate-based lead-free ceramic with a stoichiometric mismatch and a preparation method thereof. The molecular formula of the high-energy-storage silver-niobate-based lead-free antiferroelectric ceramic is Ag 0.985 La 0.005 Nb 0.93 o 2.825 (Ag 0.985 La 0.005 Nb 1-x o 3-2.5x ; x=0.07).

[0035] Preparation of Ag 0.985 La 0.005 Nb 0.93 o 2.825 (Ag 0.985 La 0.005 Nb 1-x o 3-2.5x ; x=0.07) The method of ceramics is: take high-purity Ag 2 O powder 3.4343g, high purity Nb 2 o 5 Powder 3.7084g, high purity La 2 o 3 The powder is 0.0244g, and the weighed powder is mixed and ball milled for 24 hours. The ball milling speed is selected as 300 rpm. The powder is fully manually ground for 40 minutes, and then pressed into an embryo body with a diameter of 20mm under a pressure of 52Mpa. The embryo body is pre-fired at 900°C for 6 hours in oxygen, and the heating and cooling rates are both 5°C / min. Grinding th...

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Abstract

The invention discloses stoichiometric mismatched high-energy-storage silver niobate-based ceramic and a preparation method thereof, wherein the chemical formula of the ceramic is Ag[0.985] La[0.005]Nb[1-x]O[3-2.5x], x is molar percentage, and the value of x meets the electric neutrality. Under the condition of not introducing other elements, the high-energy-storage lead-free antiferroelectric ceramic with the maximum energy storage density of 7.05 J / cm<3> (the value is the maximum value in the research field) can be obtained only by reducing the niobium ion content and changing the stoichiometric ratio of the material; and the lead-free energy storage ceramic has the advantages of high energy storage density, high breakdown electric field (318 kV / cm), high polarization intensity (74 [mu]C / cm<2>) and the like, and is expected to be applied to the fields of novel dielectric energy storage devices, pulse power devices, hybrid electric vehicles and the like. Particularly, experiments prove that under the condition that other elements are not introduced, only the innovative idea of changing the stoichiometric ratio of the material is an effective new method in research of the silver niobate-based lead-free energy storage ceramic, and the idea can be applied to the field of other dielectric energy storage research.

Description

technical field [0001] The invention relates to a stoichiometrically mismatched high-energy-storage silver niobate-based ceramic and a preparation method thereof, belonging to the technical field of functional ceramic materials. Background technique [0002] With the rapid development of the electronics industry, the development of new energy storage materials has become the focus of attention. As an important branch of energy storage systems, dielectric energy storage capacitors are widely used in various high-power devices due to their fast charge and discharge rates and high power density. However, due to the energy storage density of the dielectric energy storage capacitor (W rec ) is low, so it is greatly limited in practical applications. Among all dielectrics, with the lowest remanent polarization (P r ) and antiferroelectric energy storage ceramics (AFE) with high energy storage efficiency have received extensive attention from researchers. Silver niobate (AN)-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B41/88
CPCC04B35/495C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3227C04B2235/3291C04B2235/602C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567C04B41/4535C04B41/0072
Inventor 郭艳艳张盟张冲曾春香赵江
Owner NANJING UNIV OF POSTS & TELECOMM
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