CN104022303B - A kind of 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell - Google Patents

A kind of 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell Download PDF

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CN104022303B
CN104022303B CN201410191567.1A CN201410191567A CN104022303B CN 104022303 B CN104022303 B CN 104022303B CN 201410191567 A CN201410191567 A CN 201410191567A CN 104022303 B CN104022303 B CN 104022303B
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8ysz
dispersant
binding agent
ball milling
powder
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CN104022303A (en
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罗凌虹
吴也凡
石纪军
程亮
黄祖志
孙良良
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Jingdezhen Ceramic Institute
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
    • H01M8/1018—Polymeric electrolyte materials
    • H01M8/1069—Polymeric electrolyte materials characterised by the manufacturing processes
    • H01M8/1081—Polymeric electrolyte materials characterised by the manufacturing processes starting from solutions, dispersions or slurries exclusively of polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
    • H01M8/1018—Polymeric electrolyte materials
    • H01M8/1041—Polymer electrolyte composites, mixtures or blends
    • H01M8/1046—Mixtures of at least one polymer and at least one additive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0088—Composites
    • H01M2300/0091—Composites in the form of mixtures
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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Abstract

The invention discloses a kind of 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell, its key point is by adopting Dual Stabilization mechanism " electrostatic steric hindrance " and " sterically hindered " and the reasonable employment to dispersant and binding agent, obtain high solids content (solid content is greater than 45vol%), the zirconia of the stabilized with yttrium oxide of finely dispersed nanoscale 8YSZ(8mol%) aqueous tape casting slurry, then carry out flow casting molding and then obtain high solids content, powder granule is evenly distributed and contains the large area 8YSZ green compact film of minute quantity organic substance (dispersant and binding agent), this film and certain thickness anode (8YSZ+NiO, its proportioning is 1:1 weight ratio) burning can obtain intermediate temperature SOFC half-cell altogether after green compact casting films hot pressing lamination, wherein 8YSZ layer is electrolytic thin-membrane, its area is 10 × 10cm × cm, thickness is 10 ~ 30 μm, relative density is greater than 96%, density is high, air-tightness is good.

Description

A kind of 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell
Technical field
The invention belongs to Solid Oxide Fuel Cell manufacturing technology field, be specifically related to a kind of 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell.
Background technology
Solid Oxide Fuel Cell studies new energy technology that is very popular and forward position now, if because it does not make its cogeneration reach more than 80% by circulating, it is a kind of transform mode that current energy conversion efficiency is the highest, directly electric energy is changed into by the chemical energy of fuel, simultaneously fuel can diversity, it is become have the energy of immense commercial value and development potentiality.
Current SOFC system starts commercialization abroad, and the SOFC system as the 700W cogeneration of Japanese Kuang stone company production enters family; The 100KWSOFC system that BloomEnergy company of the U.S. produces extensively is used as power supply as the company such as eBuy, googl, Coca-Cola, Wal-Mart of Federal Express general merchandise buys by each major company.China does not also have commercialization so far due to the reason of the aspect such as technology, fund, but the achievement in research of this respect is deepening continuously and developing.
SOFC system is the integrated application body of multidisciplinary, multiple technologies, and SOFC monocell is wherein one of its critical component, and monocell can be divided into two large classes and tubular type and flat by shape.Tubular cells has the advantage of easily sealing, and planar cells has energy density is high, volume is little advantage.This patent is the preparation method about planar cells, and this patent proposes the method for a kind of aqueous tape casting legal system for large area, high-compactness intermediate temperature SOFC electrolytic thin-membrane.Aqueous tape casting technology commercialization for employing environmental friendliness, low cost prepares SOFC electrolytic thin-membrane provides technology, contributes to the commercialized development of China's Solid Oxide Fuel Cell.
Anode support type SOFC monocell, due to its electrolyte thin membranization (its thickness is generally 10 ~ 30 μm), makes its operating temperature be the SOFC that middle temperature (650 ~ 800 DEG C) is called as the second generation.The SOFC of the first generation of comparing is that its operating temperature of battery supported reduces with electrolyte, and the operating temperature of the SOFC monocell of the first generation is 850 ~ 1000 DEG C.The reduction of operating temperature is the developing direction of SOFC.This patent is the technology of preparing of the SOFC monocell about anode support type, technique prepared by this monocell making a general survey of countries in the world, total is divided into two kinds: a kind of is first curtain coating anode, on porous anode, thin layer of electrolyte is sprayed again after low-temperature sintering anode, SOFC half-cell is obtained again by high temperature sintering, silk screen printing negative electrode reburns negative electrode, finally obtains SOFC monocell; Another kind method adopts curtain coating to prepare electrolytic thin-membrane and anode thick film, this two membranes is obtained the composite membrane of the electrolytic thin-membrane of anode support type by hot pressing lamination, obtain SOFC half-cell by high temperature sintering, silk screen printing negative electrode, reburn negative electrode, finally obtains SOFC monocell.Comparison the latter of these two kinds of methods because anode and electrolyte sinter simultaneously forms, and its two-layer combination is more tight, makes the intensity of half-cell better like this; Also only burn once so technique is simple and cost is lower simultaneously.Because after this kind of method is better.Curtain coating can be divided into aqueous tape casting and non-aqueous tape casting forming technique in addition, and aqueous tape casting is because be solvent with water, and environmental protection and low cost, aqueous tape casting is the developing direction of casting technology, and industrial aqueous tape casting progressively will replace non-aqueous tape casting technology.The electrolytic thin-membrane of battery has certain area, because the area of battery is directly connected to the energy output of the monolithic of monocell, area is larger, and energy output is also larger, and this contributes to follow-up group heap and the system integration; The electrolytic thin-membrane of battery is thin, because its conductivity and its thickness exponent function relation, along with thickness increases, its conductivity declines with exponential relationship, its electrical property of extreme influence, and therefore general electrolytical thickness is 10 ~ 30 μm; Requirement except electrolyte area is large and thickness is thin, electrolytical air-tightness is also had to the most important requirement of electrolyte, electrolyte is a thin layer between anode and negative electrode, it is unique thin layer that the oxidation and induction reacting phase of battery is separated, if the gas on electrolyte both sides is collaborated mutually, decay and the destruction of battery will be caused very soon.Because electrolyte area is large and thickness is thin, the forming technique therefore to electrolytic thin-membrane proposes very high requirement, and namely to burn till rear density very high for this electrolytic thin-membrane, there is no pore (except the small closed pore that internal poles is a small amount of).Because shaping electrolyte is only 10 ~ 30 μm, therefore the nano level 8YSZ powder of general employing prepares electrolyte.
Summary of the invention
The object of this invention is to provide a kind of 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell, the method adopts the aqueous tape casting method of environment-friendly type, and obtained electrolyte thin membrane area is large, density is high, can realize suitability for industrialized production.
In order to realize goal of the invention, the technical solution used in the present invention is: a kind of 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell, comprises following processing step successively:
(1) be that the 8YSZ powder of 50 ~ 90nm joins a certain amount of employing ammoniacal liquor to regulate pH value be in the distilled water of 9 ~ 11 by a certain amount of diameter of particle, the quick ball milling (as planetary ball mill ball milling, its ball milling speed can reach 350 revs/min) carrying out 1 ~ 5hr is stand-by;
(2) adding the ball milling at a slow speed (ball milling speed is 150 ~ 200 revs/min) carrying out 24 ~ 48hr after a certain amount of dispersant carries out quick ball milling 2 ~ 6hr again disperses stand-by;
(3) add a certain amount of and the least possible binding agent again, continue at a slow speed that ball milling 24 ~ 48hr is stand-by;
(4) carry out tape casting operation by after the aqueous slurry froth in vacuum of above-mentioned gained, its casting thickness is 80 ~ 120 μm;
(5) large area film that blank thickness is 60 ~ 90 μm is obtained after the at room temperature drying of above-mentioned gained cast film;
(6) above-mentioned obtained 8YSZ film strip is supported film strips and the good anode thick film (500 ~ 800 μm) of prior curtain coating carries out hot pressing lamination, hot pressing temperature is 90 ~ 120 DEG C and pressure is 80 ~ 110MPa, and heat-insulation pressure keeping 20 ~ 60min is stand-by;
(7) above-mentioned prepared 8YSZ electrolytic thin-membrane and anodic composite film (blank) are carried out cutting the diaphragm obtaining 125mm × 125mm size stand-by;
(8) sintered by the diaphragm of above-mentioned acquisition, sintering maximum temperature is 1360 ~ 1400 DEG C, insulation 2 ~ 4hr.
Described dispersant is polyacrylic dispersant, because this dispersant can carry out electrolysis in aqueous medium: R-COOH=R-COO -+ H +.Linear R-COO is obtained after polyacrylic acid quasi-molecule dissociates -polymer ions, this ion carries out adsorbing on the surface of nano-powder particle by ball milling at a slow speed and reaches the balance being adsorbed in parsing, make the Zeta potential on powder granule surface to be turned into-60 ~-40mv by-30 ~-10mv value that is approximately before adsorbing like this, and the Zeta potential absolute value of dispersion as fruit granule of general particle be greater than 30mv just can stably dispersing.Adding of this dispersant also has space stability ultimate load except relying on electrostatic stabilization, because linear polymer is adsorbed on the surface of particle, make spatially isolating between particle and particle, the entropy that can increase system will be assembled as fruit granule thus make the gathering between particle become difficulty.The consumption of dispersant is relevant with the surface area of powder, and with the weight of powder without direct relation, the consumption of this dispersant is 1.0 ~ 2.0mg/m 2.Be exemplified below: the specific area as 8YSZ powder is 10m 2/ g, then dispersant dosage is 1.0 ~ 2.0% of powder weight; If 8YSZ powder carries out ball milling, its specific area is made to be increased to 20m 2/ g, then dispersant dosage is 2.0 ~ 4.0% of powder weight.That is the powder of same weight, be twice if its specific area increases, so the consumption of dispersant will double.
The size of dispersant molecule is very crucial for being effectively adsorbed on powder granule surface, if dispersant molecule is excessive, namely dispersant is linearly oversize, easily first be bundled together by multiple tiny powder granule, the powder granule second having adsorbed dispersant is easily built bridge thus produces particle flocculation.Therefore the molecule of its dispersant should be determined according to powder granule size, and in this patent, powder granule is 50 ~ 90nm, and the molecular weight of the dispersant of selection is 1000 ~ 3000g/mol.
Described binding agent is the latex of polyacrylic or linear water soluble polymer.The glass transition temperature Tg point (-10 DEG C ~ room temperature) below room temperature of this binding agent; if its vitrification point is more than room temperature, this binding agent is difficult to the uniformity coefficient being distributed to molecular level in the slurry; if the binding agent that Tg is too low; shaping film blank flexibility very good; dry tenacity is too low, is unfavorable for follow-up processing.Therefore the selection of its binding agent is very important, simultaneously in order to obtain high solids content, binding agent is alap and have the blank of certain adhesion strength, and the binding agent of suitable particle diameter should be selected extremely important, and this particle diameter should be suitable for the size dimension of bondd object (powder granule).In this patent, powder granule is 50 ~ 90nm, and the particle of the binding agent of selection is submicron order (100nm ~ 1000nm).
How many consumption of binding agent and particles of powder have very directly relation, on three-dimensional, an adhesive particle should be had in every 4 particles in the desirable particle piled up, therefore the consumption of binding agent is relevant with weight with the average grain diameter of powder granule, and the binder amount needed for the powder of equal in quality increases with size its consumption thinner of powder granule.In this patent, 8YSZ powder granule is 50 ~ 90nm, and the consumption of this binding agent is 2.0 ~ 5.0% of powder weight, and the amount of thinner its binding agent of powder is higher.
A kind of aqueous tape casting legal system provided by the invention is for large area, the method of high-compactness intermediate temperature SOFC electrolytic thin-membrane, it is carry out quick ball milling 1 ~ 5hr(in the distilled water of 9 ~ 11 as planetary ball mill ball milling that the 8YSZ nano-powder comprising employing 50 ~ 90nm joins a certain amount of pH value regulated, its ball milling speed can reach 350 revs/min), obtain slurry A, 8YSZ powder is it is characterized in that to carry out electrostatic steric dispersion, namely the surface charge of powder granule is regulated, it is made to be that in the sized Particles in Alkalescent Aqueous Medium of 9 ~ 11, Zeta potential is negative value (being approximately-30 ~-10mv) in pH value, now be in micro-repulsion state between powder granule place, be conducive to the dispersion (eliminating the reunion of primary particle as far as possible) between nano-powder particle.Then in slurry A, add ball milling at a slow speed (ball milling speed is 150 ~ 200 revs/min) dispersion carrying out 24 ~ 48hr after a certain amount of dispersant carries out quick ball milling 2 ~ 6hr again, obtain slurry B, it is characterized in that described dispersant is polyacrylic dispersant, because this dispersant can carry out electrolysis in aqueous medium: R-COOH=R-COO -+ H +.In slurry B, add a certain amount of and the least possible binding agent, continue ball milling 24 ~ 48hr at a slow speed, obtain slurry C, it is characterized in that this binding agent is water miscible and Tg point (-10 DEG C ~ room temperature) below room temperature, the granular size of binding agent should match with powder granule size, and be submicron order (100nm ~ 1000nm), its consumption is relevant with powder weight with powder granule size.The consumption of binder added should be the least possible, do not ftracture as maximum, can significantly improve the solid content of 8YSZ casting slurry like this with electrolytic thin-membrane drying, thus obtain the 8YSZ electrolytic thin-membrane of high-compactness at a lower temperature.Finally, slurry C obtains large area 8YSZ green compact film through curtain coating, after this film and certain thickness anode (8YSZ+NiO, its proportioning is 1:1 weight ratio) green compact casting films hot pressing lamination, burning can obtain intermediate temperature SOFC half-cell altogether, and wherein 8YSZ layer is electrolytic thin-membrane.
Nano-powder due to particle be nanoscale, its being uniformly dispersed in aqueous medium is very difficult, and then is difficult to obtain the finely dispersed 8YSZ casting slurry of high solids content.The present invention proposes the measure of some row to obtain high solids content, finely dispersed 8YSZ nanometer casting slurry: first, adopt Dual Stabilization mechanism " electrostatic steric hindrance " and " sterically hindered " (certainly based on " sterically hindered "); Secondly, water-soluble binder is adopted.Concrete steps are as follows: a certain amount of distilled water regulates its pH value to be 9 ~ 11 by (1), a certain amount of 8YSZ nano-powder is added in above-mentioned distilled water, carry out quick ball milling 1 ~ 5hr(as planetary ball mill ball milling, its ball milling speed can reach 350 revs/min), to destroy the reunion of nano-powder, then a certain amount of dispersant is added, dispersant dosage is determined by the surface area of powder, not a lot of document report by the weight of powder, the selection of dispersant molecule amount should by the size of its powder granule, the molecular weight of the larger dispersant of particle is larger, if nanoscale, the molecular weight selecting dispersant is 1000 ~ 3000g/mol.First ball milling 2 ~ 6hr fast after adding dispersant, destroy the reunion of nano particle, dispersant solution is fully contacted with 8YSZ powder, then ball milling 24 ~ 48hr(ball milling speed that ball milling speed slowed down is 150 ~ 200 revs/min), its objective is the dispersion in order to carry out powder, ball milling speed is to allow dispersant molecule adsorb on powder granule surface more slowly, and when giving sufficient chien shih its reach the absorption of dispersant molecule in solid particles surface and the balance of parsing; (2) then add a certain amount of (minimum as far as possible) binding agent, continue ball milling 24 ~ 48hr at a slow speed.The object of ball milling allows binding agent molecule carry out adsorbing or being evenly dispersed between powder granule on powder granule surface on the one hand at a slow speed; On the one hand some dispersant such as dispersant of latex class can not ball milling fast in addition, can destroy its latex particle like this, thus lose cementitiousness.This binding agent is water miscible and Tg point (-10 DEG C ~ room temperature) below room temperature, and the granular size of binding agent should match with powder granule size, is submicron order (100 ~ 1000nm).How many consumption of binding agent and particles of powder have very directly relation, on three-dimensional, an adhesive particle should be had in every 4 particles in the desirable particle piled up, therefore the consumption of binding agent is relevant with weight with the average grain diameter of powder granule, and the binder amount needed for the powder of equal in quality increases with size its consumption thinner of powder granule.In this patent, 8YSZ powder granule is 50 ~ 90nm, and the consumption of this binding agent is 2.0 ~ 5.0% of powder weight, and the amount of thinner its binding agent of powder is higher.The consumption of binder added should be the least possible, do not ftracture as maximum, can significantly improve the solid content of 8YSZ casting slurry like this with electrolytic thin-membrane drying, thus obtain the 8YSZ electrolytic thin-membrane of high-compactness at a lower temperature.
Electrolyte thin membrane area prepared by the inventive method is 10 × 10cm × cm, thickness is 10 ~ 30 μm, relative density is greater than 96%, air-tightness is high.
Accompanying drawing explanation
Fig. 1 is that the battery section SEM that embodiment 1 obtains schemes;
Fig. 2 is the obtained cell I-V of embodiment 1 and I-P curve chart;
Fig. 3 is that the battery section SEM that embodiment 2 obtains schemes;
Fig. 4 is the obtained cell I-V of embodiment 2 and I-P curve.
Embodiment
embodiment 1
By D 50for the 8YSZ powder of 90nm, (Japanese Tosoh company, specific area is 10m 2/ g) 80g joins in the ball grinder that 15g distilled water is housed, and it is 9.5 that this distilled water has adopted ammoniacal liquor to have adjusted pH, quick planetary ball mill 1hr, and ball milling speed is 400 revs/min; Then add 1.0g polyacrylic acid (PAA) dispersant, the molecular weight of this dispersant is 2000g/mol, ball milling 24hr at a slow speed after quick ball milling 2hr, and ball milling speed is 120 revs/min at a slow speed; Add 4g binding agent again, binding agent is polyacrylic latex, and its granularity is 150nm.Continue ball milling 24hr.This slurry is taken out and carries out vacuum defoamation 20 minutes, the slurry of deaeration is poured in the groove of casting machine, curtain coating knife edge thickness 100 μm, curtain coating speed 25 revs/min.
By the electrolyte biscuit that sticks in film strips and the good anode biscuit hot pressing lamination of prior curtain coating, hot pressing temperature is 100 DEG C, and pressure is 100MPa, and hot pressing time is 20 minutes.
Sintered by the diaphragm of above-mentioned acquisition, most high sintering temperature is that 1390 DEG C of insulation 2.5hr obtain SOFC anode support type half-cells, then prepares negative electrode and obtain SOFC monocell.
The section SEM being illustrated in figure 1 battery schemes, and the visible intermediate layer of this figure is the microstructure of dielectric substrate, very fine and close, only have the closed pore of minute quantity, relative density is 98.1%, and electrolyte thickness is about 27 μm, upper layer is cell cathode layer, is galvanic anode layer below.Fig. 2 is electrical property I-V and the I-P curve of this monocell, and maximum power density is 0.32w/cm 2, OCV is 1.172V.OCV is the open circuit voltage of battery, and this value is the optimality criterion whether evaluation cell electrolyte leaks gas, and general OCV is greater than 1.0, then can judge that battery is air tight, and electrolyte is fine and close, and the OCV of battery prepared by the present embodiment is 1.172V, close to theoretical OCV.
embodiment 2
By D 50for the 8YSZ powder of 70nm, (Japanese Tosoh company, specific area is 12m 2/ g) 78g joins in the ball grinder that 16g distilled water is housed, and it is 10.0 that this distilled water has adopted ammoniacal liquor to have adjusted pH, quick planetary ball mill 2hr, and ball milling speed is 400 revs/min; Then add 1.5g polyacrylic acid (PAA) dispersant, the molecular weight of this dispersant is 3000g/mol, ball milling 36hr at a slow speed after quick ball milling 2hr, and ball milling speed is 120 revs/min at a slow speed; Add 4.5g binding agent again, binding agent is polyacrylic latex, and its particle is 150nm, continues ball milling 36hr.This slurry is taken out and carries out vacuum defoamation 25 minutes, the slurry of deaeration is poured in the groove of casting machine, curtain coating knife edge thickness 80 μm, curtain coating speed 20 revs/min.
By the electrolyte biscuit that sticks in film strips and the good anode biscuit hot pressing lamination of prior curtain coating, hot pressing temperature is 110 DEG C, and pressure is 100MPa, and hot pressing time is 35 minutes.
Sintered by the diaphragm of above-mentioned acquisition, most high sintering temperature is that 1370 DEG C of insulation 4hr obtain SOFC anode support type half-cells, then prepares negative electrode and obtain SOFC monocell.
The section SEM being illustrated in figure 3 battery schemes, and the visible intermediate layer of this figure is the microstructure of dielectric substrate, very fine and close, only have the closed pore of minute quantity, relative density is 97.0%, and electrolyte thickness is about 21 μm, upper layer is cell cathode layer, is galvanic anode layer below.Fig. 4 is electrical property I-V and the I-P curve of this monocell, and maximum power density is 0.30w/cm 2, OCV is 1.171V.OCV is the open circuit voltage of battery, and this value is the optimality criterion whether evaluation cell electrolyte leaks gas, and general OCV is greater than 1.0, then can judge that battery is air tight, and electrolyte is fine and close, and the OCV of battery prepared by the present embodiment is 1.171V, close to theoretical OCV.

Claims (3)

1. a 8YSZ electrolyte thin membrane preparation method for anode support type intermediate temperature SOFC monocell, comprises following processing step successively:
(1) be that the 8YSZ powder of 50 ~ 90nm joins and is equipped with in the ball grinder of distilled water by particle diameter, carry out the quick ball milling of planet 1 ~ 2 hour with the speed being not less than 350 revs/min; It is 9 ~ 11 that described distilled water adopts ammoniacal liquor to regulate pH value in advance, and ball milling employing footpath grain is the zirconia ball mill of 0.5 ~ 1.0mm;
(2) add dispersant, after carrying out quick ball milling 2 ~ 3hr with the speed being not less than 350 revs/min, carry out ball milling 24 ~ 48hr at a slow speed with the speed of 150 ~ 200 revs/min again; It is 1000 ~ 3000g/mol polyacrylic dispersant that described dispersant is selected from molecular weight, and its consumption calculates as follows: take specific area as 10m 2the 8YSZ powder of/g is benchmark, and the consumption of dispersant is 1.0 ~ 2.0% of powder weight; If the specific area of 8YSZ powder increases, then the consumption of dispersant is by increasing in proportion;
(3) add binding agent again, continue to carry out ball milling 24 ~ 48hr at a slow speed with the speed of 150 ~ 200 revs/min and obtain aqueous slurry; Described binding agent is water miscible, and glass transition temperature point is between-10 DEG C ~ room temperature, and the granular size of binding agent is submicron order, and consumption is 2.0 ~ 5.0% of 8YSZ powder weight;
(4) carry out tape casting operation by after the aqueous slurry froth in vacuum of above-mentioned gained, its casting thickness is 80 ~ 120 μm;
(5) the large area 8YSZ film blank that blank thickness is 60 ~ 90 μm is obtained after the at room temperature drying of above-mentioned gained cast film;
(6) above-mentioned obtained 8YSZ film blank band is supported film strips and the good anode thick film blank of prior curtain coating carries out hot pressing lamination, hot pressing temperature is 90 ~ 120 DEG C and pressure is 80 ~ 110Mpa, and heat-insulation pressure keeping 20 ~ 60min is stand-by;
(7) above-mentioned prepared 8YSZ electrolytic thin-membrane and anodic composite film blank are carried out cutting the diaphragm obtaining 125mm × 125mm size stand-by;
(8) sintered by the diaphragm of above-mentioned acquisition, sintering maximum temperature is 1360 ~ 1400 DEG C of insulation 2 ~ 4hr.
2. the 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell according to claim 1, is characterized in that: described dispersant is polyacrylic dispersant.
3. the 8YSZ electrolyte thin membrane preparation method of anode support type intermediate temperature SOFC monocell according to claim 1 and 2, is characterized in that: described binding agent is the latex of polyacrylic.
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