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Oxygen ion conductor and preparation method and application thereof

A technology of oxygen ion conductor and molecular formula, which is applied in the field of oxygen ion conductor and its preparation, can solve the problems of poor chemical stability and increased impedance of solid fuel cells, improve adsorption performance and charge transfer process, increase conductivity, and achieve huge The effect of capacity

Active Publication Date: 2018-10-19
CHINA SPALLATION NEUTRON SOURCE SCI CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A conventional solid oxide fuel cell is composed of a cathode, an electrolyte, and an anode. Usually, the operating temperature is required to be above 800°C to improve the conductivity in the electrolyte and the catalytic activity in the cathode. However, at high temperatures, the interaction between different components Interaction occurs to form a second phase, resulting in an increase in impedance over time, which can lead to poor long-term electrochemical stability of solid fuel cells

Method used

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  • Oxygen ion conductor and preparation method and application thereof
  • Oxygen ion conductor and preparation method and application thereof
  • Oxygen ion conductor and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0038] Will Zr 0.8 Y 0.2 o 1.9 with LiOH·H 2 O ball milling is evenly mixed, the ball milling speed is 200rpm, and the ball milling time is 12h to obtain a granular mixture, wherein the molar ratio of Li in the dopant to the YSZ electrolyte raw material is 10mol.%, that is, Zr 0.8 Y 0.2 o 1.9 with LiOH·H 2 The molar ratio of O was 1:0.1; then, the mixture was heated to 1000 °C in air atmosphere, kept at this temperature for 24 h, and then cooled to room temperature to obtain the oxygen ion conductor Li 0.1 Zr 0.8 Y 0.2 o 1.95 , in this embodiment, x=0.05.

[0039] Using LiOH·H 2 The general reaction formula of O as a dopant is:

[0040] Zr 0.8 Y 0.2 o 1.9 (YSZ)+2xLiOH·H 2 O = Li 2x Zr 0.8 Y 0.2 o 1.9+x +3xH 2 o

Embodiment 2

[0042] Will Zr 0.8 Y 0.2 o 1.9 with LiOH·H 2 O ball milling is evenly mixed, the ball milling speed is 200rpm, and the ball milling time is 12h to obtain a granular mixture, wherein the molar ratio of Li in the dopant to the YSZ electrolyte raw material is 10mol.%, that is, Zr 0.8 Y 0.2 o 1.9 with LiOH·H 2 The molar ratio of O was 1:0.1; then, the mixture was heated to 1400 °C in air atmosphere and kept for 12 h, and then cooled to room temperature to obtain the oxygen ion conductor Li 0.1 Zr 0.8 Y 0.2 o 1.95 , in this embodiment, x=0.05.

Embodiment 3

[0044] Will Zr 0.8 Y 0.2 o 1.9 with LiOH·H 2 O ball milling is evenly mixed, the ball milling speed is 200rpm, and the ball milling time is 12h to obtain a granular mixture, wherein the molar ratio of Li in the dopant to the YSZ electrolyte raw material is 20mol.%, that is, Zr 0.8 Y 0.2 o 1.9 with LiOH·H 2 The molar ratio of O was 1:0.2; then, the mixture was heated to 1000°C in air atmosphere and kept for 18h, and then cooled to room temperature to obtain the oxygen ion conductor Li 0.2 Zr 0.8 Y 0.2 o 2 , in this embodiment, x=0.1.

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Abstract

The invention discloses a novel compound, i.e., oxygen ion conductor Li2xZr0.8Y0.2O1.9+x. Both sintering character and electric conductivity are improved. Simultaneously, the invention further provides a preparation method of the oxygen ion conductor and application of the oxygen ion conductor. The Li2xZr0.8Y0.2O1.9+x disclosed by the invention is a novel oxygen ion conductor compound; a small amount of Li and O are doped into a structure of a YSZ electrolyte through a solid-state synthesis method, the novel compound is endowed with unique chemical properties, and oxygen ions can conduct current at high temperature, so that the electric conductivity of the compound as an electrolyte is optimized. The compound can serve as a solid electrolyte of solid oxide fuel cells or high-temperature lithium cells, and the high-temperature lithium cells using the electrolyte can provide huge capacity, good stability and high cell capacity.

Description

technical field [0001] The invention relates to an oxygen ion conductor and its preparation method and application, belonging to the technical field of batteries. Background technique [0002] A solid fuel cell (SOFC) is a fuel (such as H 2 、CH 4 ) and oxidizing agents (such as O in air 2 ), which is converted into electrical energy and heat energy with high efficiency (ε≥80%) by electrochemical methods. A conventional solid oxide fuel cell is composed of a cathode, an electrolyte, and an anode. Usually, the operating temperature is required to be above 800°C to improve the conductivity in the electrolyte and the catalytic activity in the cathode. However, at high temperatures, the interaction between different components Interactions occur to form a second phase, resulting in an increase in impedance over time, which leads to poor long-term electrochemical stability of the solid fuel cell. One of the solutions being explored in the industry is to increase the conductivi...

Claims

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Application Information

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IPC IPC(8): H01M8/1016H01M10/0562
CPCH01M8/1016H01M10/0562Y02E60/10Y02E60/50
Inventor 简宏希杨华薄涛王保田
Owner CHINA SPALLATION NEUTRON SOURCE SCI CENT
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