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Method for testing ion diffusion coefficient in solid electrolyte

A solid electrolyte and ion diffusion technology, applied in the fields of chemistry, material science and engineering, and physics, can solve problems such as difficult to determine parameters, limited testing technology, and difficulty in applying electrolyte materials, and achieve the effect of easy realization and convenient operation

Active Publication Date: 2018-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, these methods are mainly used to measure the diffusion coefficient of ions in embedded materials, which are difficult to apply to electrolyte materials without intercalation process; and these methods are also limited by their respective testing techniques, such as AC impedance technology is only applicable to the occurrence of warburg impedance , while the current pulse relaxation method, AC impedance technique, and constant current intermittent titration technique all involve some parameters that are difficult to determine, and can only be replaced by approximate methods (measurement method of lithium ion diffusion coefficient, "Power Technology", 1999 (23) , P335-338)

Method used

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  • Method for testing ion diffusion coefficient in solid electrolyte
  • Method for testing ion diffusion coefficient in solid electrolyte
  • Method for testing ion diffusion coefficient in solid electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0062] (1) The solid electrolyte Ce 0.65 La 0.35 o 1.825 A dense test sample is synthesized, cut into a rectangular cuboid, and after the surface is polished, silver paste is plated on two opposite end faces in the length direction as electrodes, and silver wires are glued on as leads. After the electrode part is coated with high-melting point glass powder, it is placed in a muffle furnace and heated to 800 ° C and then cooled with the furnace to seal the electrode part and insulate it from the air.

[0063] (2) Place the solid electrolyte in a heating table and heat it to a first temperature of 450° C., between two electrodes, start from the edge of one side of the electrode, and test the Raman spectrum of the material at intervals of 100 μm.

[0064] (3) Apply an electric field with an intensity of 54 V / m, and keep warm at the first temperature of 450° C. for 12 hours.

[0065] (4) remove the electric field, when t=0min, between the two electrodes, from the edge of the el...

Embodiment 2

[0069] (1) The solid electrolyte Ce 0.65 La 0.35 o 1.825 A dense test sample is synthesized, cut into a rectangular cuboid, and after the surface is polished, silver paste is plated on two opposite end faces in the length direction as electrodes, and silver wires are glued on as leads. After the electrode part is coated with high-melting point glass powder, it is placed in a muffle furnace and heated to 800 ° C and then cooled with the furnace to seal the electrode part and insulate it from the air.

[0070] (2) Place the solid electrolyte in a heating table and heat it to the first temperature of 450°C. Between the two electrodes, start from the edge of the electrode on one side, and test the Raman spectrum of the material at intervals of 100 μm.

[0071] (3) Apply an electric field with an intensity of 54 V / m, and keep warm at the first temperature of 450° C. for 12 hours.

[0072] (4) remove the electric field, when t=0min, between the two electrodes, from the edge of th...

Embodiment 3

[0076] (1) The solid electrolyte Ce 0.65 La 0.35 o 1.825 A dense test sample is synthesized, cut into a rectangular cuboid, and after the surface is polished, silver paste is plated on two opposite end faces in the length direction as electrodes, and silver wires are glued on as leads. After the electrode part is coated with high-melting point glass powder, it is placed in a muffle furnace and heated to 800 ° C, and then cooled with the furnace to seal the electrode part and insulate it from the air;

[0077] (2) Put the solid electrolysis in the heating table and heat it to the first temperature of 500°C. Between the two electrodes, start from the edge of the electrode on one side, and test the Raman spectrum of the material at intervals of 100 μm;

[0078] (3) Apply an electric field with an intensity of 54V / m, and keep it warm at a first temperature of 500°C for 10 hours;

[0079] (4) remove the electric field, when t=0min, between the two electrodes, from the edge of th...

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Abstract

The invention provides a method for testing an ion diffusion coefficient in a solid electrolyte. The method comprises the following steps: applying an electric field to to-be-tested solid electrolyteat a certain temperature, enabling ion concentration in a material to be in graded distribution, then removing an electric field, and testing the Raman spectrum of the material at regular intervals byusing a laser confocal microscopic Raman spectrometer in the direction of the electric field at a certain distance; and taking the ratio of the integral area of a Raman spectrum characteristic peak position of to-be-tested ions to the total integral area as ion concentration so as to obtain ion concentration distribution at different times after the electric field is removed; and finally, carrying out fitting by using a function relationship of the ion concentration, time and space positions to obtain an ion diffusion coefficient. The method is simple and convenient to operate, and the diffusion coefficient of ions in the solid electrolyte can be measured rapidly and accurately.

Description

technical field [0001] This application relates to, but not limited to, the fields of physics, chemistry, and material science and engineering, and specifically, relates to, but not limited to, a method for determining ion diffusion coefficients in solid electrolytes. Background technique [0002] Solid oxide electrolytes are widely used in fuel cells, oxygen sensors, oxygen pumps, etc., and play an important role in the development of clean energy and environmental protection. Common solid oxide electrolytes include yttria-stabilized zirconia, gadolinium-doped ceria, and the like. The conductive mechanism of these electrolyte materials is that the oxygen ions in the crystal lattice migrate at a certain temperature and move directionally along the direction of the electric field. Therefore, the transport process of oxygen ions in the material plays an important role, and it is also an important parameter for evaluating the performance of solid oxide electrolyte materials. ...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N21/65
Inventor 李天君潘伟
Owner TSINGHUA UNIV
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