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A high energy storage silver niobate based ceramic with stoichiometric mismatch and its preparation method

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: 2022-06-17
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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  • A high energy storage silver niobate based ceramic with stoichiometric mismatch and its preparation method
  • A high energy storage silver niobate based ceramic with stoichiometric mismatch and its preparation method
  • A high energy storage silver niobate based ceramic with stoichiometric mismatch and its preparation method

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Embodiment 1

[0027] The present embodiment provides a stoichiometric mismatched high energy storage silver niobate-based lead-free ceramic and a preparation method thereof, and 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) 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, and the ball-milling speed is selected as 300 rpm. The powder was 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 was placed in oxygen and pre-fired at 890 ° C for 6 hours, and the heating and cooli...

Embodiment 2

[0031] The present embodiment provides a stoichiometric mismatched high energy storage silver niobate-based lead-free ceramic and a preparation method thereof, and 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, and the ball-milling speed is selected as 300 rpm. The powder was fully manually ground for 40 minutes, and then pressed into an embryo body with a diameter of 20mm using a pressure of 47Mpa. The embryo body was placed in oxygen and pre-fired at 890 ° C for 6 hours, and the heating and cooling rates were bot...

Embodiment 3

[0034] The present embodiment provides a high energy storage silver niobate-based lead-free ceramic with stoichiometric mismatch and a preparation method thereof, and 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, and the ball-milling speed is selected as 300 rpm. The powder was 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 was placed in oxygen and pre-fired at 900 ° C for 6 hours, and the heating and cooling rates we...

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Abstract

The invention discloses a high-energy-storage silver niobate-based ceramic with stoichiometric mismatch and a preparation method thereof. The chemical formula of the ceramic is Ag 0.985 La 0.005 Nb 1‑x o 3‑2.5x ,in x is the mole percentage, x The value of satisfies electrical neutrality. In the present invention, without introducing other elements, only by reducing the content of niobium ions and changing the stoichiometric ratio of the material, a maximum energy storage density of 7.05 J / cm is obtained. 3 High energy storage lead-free antiferroelectric ceramics (this value is the highest value in this research field), and the lead-free energy storage ceramics have high energy storage density, high breakdown electric field (318kV / cm), high polarization Intensity (74μC / cm 2 ) and other advantages, it is expected to be applied in new dielectric energy storage devices, pulse power devices, hybrid electric vehicles and other fields. In particular, experiments have proved that the innovative idea of ​​only changing the stoichiometric ratio of materials without introducing other elements is an effective new method in the research of silver niobate-based lead-free energy storage ceramics, and the The idea is applied to other fields of dielectric energy storage research.

Description

technical field [0001] The invention relates to a stoichiometric 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 charging and discharging rates and high power density. However, due to the energy storage density (W rec ) is low, so its practical application is greatly restricted. In all dielectrics, with low remanent polarization (P r ) and antiferroelectric energy storage ceramics (AFEs) with higher energy storage efficiency have received extensive attention from researchers. Silver niobate (AN)-based ceramic materials have gradually become a new ...

Claims

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Application Information

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Patent Type & Authority Patents(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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