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Sintering method of electrolytes for solid oxide fuel cell

A solid oxide, fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, circuits, etc., can solve the problems of long sintering time and high temperature, and achieve the effect of improving sintering rate and simple device

Active Publication Date: 2015-12-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of long sintering time and high temperature in the prior art, and provide a sintering method for solid oxide fuel cell electrolyte

Method used

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  • Sintering method of electrolytes for solid oxide fuel cell
  • Sintering method of electrolytes for solid oxide fuel cell
  • Sintering method of electrolytes for solid oxide fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add the binder to the SDC electrolyte powder, grind it evenly, dry it and press it into a strip; then connect platinum wires to both ends of the electrolyte sample, and connect them in series to the circuit; then place the whole in the furnace and raise it from room temperature to 680 ℃, apply 90Vcm to the electrolyte spline in the circuit when the temperature starts to rise -1 Field strength; set the furnace temperature rise rate to 10℃min -1 , When the temperature rises to 670℃, flashing occurs, record the temperature at this time; at the same time, the current will be changed stepwise, that is, the current will be limited at 0.10A and maintained for 100s, and then the current will change to 0.20A and maintained for 100s , And so on, until the current rises to 0.6A, and sintering at a constant current of 0.6A for 25min, the electrolyte is sintered densely. Then the furnace temperature is naturally cooled to room temperature, and the SEM image of the surface of the SDC e...

Embodiment 2

[0030] Add the binder to the YSZ electrolyte powder, grind it evenly, dry it and press it into a strip; then connect platinum wires to the two ends of the electrolyte sample and connect it in series to the circuit; then place the whole in the furnace and raise it from room temperature to 1160℃, when the temperature starts to increase, apply 30Vcm to the electrolyte spline in the circuit -1 Field strength; set the furnace temperature rise rate to 10℃min -1 , When the temperature rises to 1150℃, flashing occurs, record the temperature at this time; at the same time, the current will change stepwise, that is, the current will be limited at 0.05A and maintained for 100s, and then the current will change to 0.10A and maintained for 100s , And so on, until the current rises to 0.8A, and sintering at a constant current of 0.8A for 5 minutes, the electrolyte is sintered and dense. Then the furnace temperature is naturally cooled to room temperature, and the SEM image of the YSZ electrol...

Embodiment 3

[0032] Add a binder to the LSGM electrolyte powder, grind it evenly, dry it, and press it into a strip; then connect platinum wires to both ends of the electrolyte sample and connect them in series to the circuit; then place the whole in the furnace and raise it from room temperature to 700 ℃, apply 100Vcm to the electrolyte spline in the circuit when the temperature starts to rise -1 Field strength; set the furnace temperature rise rate to 10℃min -1 , When the temperature rises to 690 ℃, flashing phenomenon occurs, record the temperature at this time; at the same time, the current will undergo a stepwise change, that is, when the current rises to 0.5A, the current will be limited, and the constant current will be sintered at 0.5A. After 10 minutes, the electrolyte is sintered and dense. Then the furnace temperature is naturally cooled to room temperature, and the SEM image of the LSGM electrolyte surface obtained by sintering is shown as image 3 Shown. The impedance value of ...

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Abstract

The invention relates to a sintering method of electrolytes for a solid oxide fuel cell, and belongs to the field of solid oxide fuel cells. The method comprises the steps as follows: a binder is added to solid oxide electrolyte powder which is pressed into a block; different electric fields are applied to different electrolytes; the field intensity can be adjusted from 30Vcm<-1> to 200Vcm<-1>; meanwhile, the electrolytes are heated in a furnace; the current is instantly increased when the electrolytes are heated to 500-1250 DEG C; the current is limited; and constant-current heat-insulated sintering is carried out, so that the electrolytes are densely sintered. Compared with a conventional electrolyte sintering method, the sintering method provided by the invention has the advantages that the sintering method is low in furnace temperature requirements and high in sintering rate; electrolyte ceramic which is difficult to sinter can be densified; a sintering aid does not need to be added; and a device is simple and convenient.

Description

Technical field [0001] The invention relates to a method for sintering a solid oxide fuel cell electrolyte, and belongs to the field of solid oxide fuel cells. Background technique [0002] The solid oxide fuel cell (SOFC) is an efficient and clean energy conversion system that directly converts the chemical energy in the fuel into electrical energy. And SOFC also has the advantages of low pollution, low noise, and a wide range of usable fuels. However, the preparation of SOFC is a process that consumes a lot of energy and time, especially for the sintering preparation process of its electrolyte. In order to ensure the stability and durability of the electrolyte and prevent the battery from short-circuiting, the electrolyte must be fully compacted. In this way, it must be kept in a high temperature environment for a long time to make the electrolyte green body fully compact. At present, the most commonly used method of densifying SOFC electrolyte is the traditional sintering me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/12
CPCH01M8/1253H01M8/126H01M2008/1293Y02E60/50
Inventor 孙克宁王振华张晶江泰志
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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