Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
breakdown field strengthaaaaaaaaaa
energy densityaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com