CN113471500A - Molten carbonate fuel cell salt membrane and preparation method thereof - Google Patents
Molten carbonate fuel cell salt membrane and preparation method thereof Download PDFInfo
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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
- H01M8/14—Fuel cells with fused electrolytes
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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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of molten carbonate fuel cells, and particularly relates to an electrolyte salt membrane of a molten carbonate fuel cell and a preparation method thereof. The salt film comprises the following components in parts by weight: 9-13 parts of electrolyte and 1 part of water-soluble adhesive, wherein the water-soluble adhesive has water swelling property. The invention aims at the characteristic that carbonate electrolyte is difficult to wet and difficult to form a film, a method for preparing slurry is not adopted, but a method for mixing carbonate and a water-soluble binder and then stirring and standing the mixture with a small amount of water is adopted, so that the binder is fully swelled and wraps the surface of electrolyte powder to form a uniform colloid state, and the mixed colloid of the carbonate and the binder is actually prepared into thinner powder in the crushing process, thereby being beneficial to hot pressing and forming in a die.
Description
Technical Field
The invention belongs to the technical field of molten carbonate fuel cells, and particularly relates to an electrolyte salt membrane of a molten carbonate fuel cell and a preparation method thereof.
Background
The Molten Carbonate Fuel Cell (MCFC) is a high-temperature Fuel Cell working at 650 ℃, has the advantages of no need of noble metal as a catalyst, wide Fuel source, low noise, nearly zero emission of pollutants, high power generation efficiency, realization of combined heat and power supply and the like, is suitable for distributed power stations or fixed power stations of hundreds kilowatt level to megawatt level, and has good development and application prospects.
The molten carbonate fuel cell operates at 650 deg.c, and the structure of MCFC can be divided into three parts, cathode, electrolyte and anode, where the electrolyte is molten carbonate. The electrolyte system of the MCFC is composed of a porous diaphragm carrier and carbonate, the molten carbonate electrolyte completely fills the pores of the electrolyte diaphragm by virtue of capillary force, and the carbonate electrolyte is fixed in the diaphragm carrier to form an electrolyte layer. The electrolyte layer is a carbonate ion conductor and has good ion conductivity, the cathode separator and the anode separator can block gas from passing through, and the plasticity of the electrolyte layer can be used for gas sealing of the battery and preventing gas from leaking, namely, wet sealing.
In the prior art, carbonate electrolyte is typically filled in a cell during MCFC assembly, and the electrolyte is typically pre-filled in the cathode and/or anode gas chambers, slowly melts as the cell temperature increases, and is immersed in the pores in the electrolyte membrane under the capillary force of the electrolyte membrane. Such treatment has the problem that the electrolyte, before melting, affects the distribution of the gases in the flow field, the combustion of the organic substances in the membrane and the volatilization of the combustion products; the electrolyte is likely to be entrained by the gas into the channels, blocking the channels. If the carbonate could be made into a salt film in a similar way to the preparation of the separator, it would help solve the problem of electrolyte management. Firstly, the film-shaped salt film can not block a flow field to cause uneven gas distribution; secondly, the contact of the salt film with the electrolyte membrane is improved, which promotes better distribution of the electrolyte within the electrolyte membrane.
Therefore, the preparation method of the carbonate electrolyte membrane is an important factor affecting the performance of the MCFC. The carbonate electrolyte membrane is prepared by mixing carbonate electrolyte with organic solvent, binder, plasticizer, defoaming agent, etc. and ball milling for certain time through flow casting. For example, the prior patent literature discloses LiAlO using water as a solvent2The integrated electrolyte membrane prepared by mixing and ball-milling with carbonate electrolyte has loose structure and low strength because no binder is used, and the integral membrane is fractured by high assembly pressure in the assembly process, so that gas blowby and gas leakage of the membrane are directly caused, the performance is poor, and even the cathode and the anode are short-circuited to cause direct combustion. In addition, the carbonate is insoluble in water and organic solvent, the wettability of the surface of the electrolyte powder is poor, and the carbonate is difficult to combine with the binder, which brings great difficulty to the preparation process of the salt film.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the electrolyte salt membrane of the molten carbonate fuel cell in the prior art has loose structure, low strength, easy fracturing, poor carbonate wettability, difficult mixing with a binder, difficult molding preparation and the like, thereby providing the salt membrane of the molten carbonate fuel cell and the preparation method thereof.
Therefore, the invention provides the following technical scheme:
the invention provides an electrolyte salt membrane of a molten carbonate fuel cell, which comprises the following components in parts by weight: 9-13 parts of electrolyte and 1 part of water-soluble binder;
wherein the water-soluble adhesive has water-swelling properties.
Optionally, the water-soluble binder is at least one of Methylcellulose (MC), sodium carboxymethylcellulose (CMC), polyvinyl alcohol (PVA), and Hydroxypropylmethylcellulose (HPMC).
Optionally, the electrolyte is a mixture of lithium carbonate and potassium carbonate or a mixture of lithium carbonate and sodium carbonate.
Optionally, the electrolyte comprises a molar ratio of 68%: 32% of lithium carbonate and potassium carbonate,
alternatively, a molar ratio of 52%: 48% of lithium carbonate and sodium carbonate.
The invention provides a preparation method of the electrolyte salt membrane of the molten carbonate fuel cell, which comprises the following steps:
uniformly mixing electrolyte powder and water-soluble binder powder to obtain powder;
adding water accounting for 3-7% of the powder into the obtained powder, stirring and mixing, sealing and standing, and drying to obtain a mixture;
and crushing the obtained mixture, performing hot-press molding and drying to obtain the electrolyte salt membrane of the molten carbonate fuel cell.
Optionally, the sealing standing time is 12-24 h.
Optionally, the drying temperature is 30-35 ℃ and the drying time is 3-8 h.
Optionally, the mix is crushed to 50-100 μm.
Optionally, the hot-press molding temperature is 80-95 ℃, the pressure is 5-8MPa, and the dwell time is 3-5 min.
Optionally, the stirring and mixing time is 1-2 h.
The technical scheme of the invention has the following advantages:
the invention provides a salt membrane of a molten carbonate fuel cell, which comprises the following components in parts by weight: 9-13 parts of electrolyte and 1 part of water-soluble adhesive, wherein the water-soluble adhesive has water swelling property. According to the invention, the water-soluble binder with the characteristic of swelling in water is selected, so that the electrolyte and the binder are easy to mix and form, the strength of the salt membrane of the molten carbonate fuel cell is improved, and cracking is avoided. In addition, the specific binder selected by the invention can be completely decomposed at high temperature, so that the technical problem that the performance of the MCFC is influenced because the undecomposed binder can generate carbon deposition in a single cell because the high molecular binder used in the prior art is difficult to be completely decomposed in the temperature rising process of the MCFC is solved.
The preparation method of the electrolyte salt membrane of the molten carbonate fuel cell comprises the following steps of uniformly mixing electrolyte powder and water-soluble binder powder to obtain powder; adding water accounting for 3-7% of the powder into the obtained powder, stirring and mixing, sealing and standing, and drying to obtain a mixture; and crushing the obtained mixture, performing hot-press molding, and drying to obtain the molten carbonate fuel cell salt membrane. The invention aims at the characteristics that carbonate electrolyte is difficult to wet and film-forming and molding, a method for preparing slurry is not adopted, but a method for fully mixing carbonate and a specific water-soluble binder and then stirring and standing the mixture with a small amount of water is adopted, so that the binder is fully swelled and wraps the surface of electrolyte powder to form a uniform colloid state, redundant water is removed in the drying process, the mixed colloid of the carbonate and the binder is actually prepared into finer powder in the crushing process, the hot-pressing molding in a die is facilitated, the method has typical operability, the water-soluble binder has the characteristic of easy decomposition, water in a salt film is volatilized to form a porous material, a formed pore channel is favorable for the discharge and decomposition of organic components in a diaphragm, the diaphragm carrier is directly filled with the electrolyte after the electrolyte is melted, and the loss of the electrolyte of a molten carbonate fuel cell under the high-temperature condition is reduced, the sealing performance and the service life of the battery are improved, and the salt film and the diaphragm matched in a single battery test experiment can keep higher discharge voltage and power density in the battery experiment.
The preparation method of the electrolyte salt membrane of the molten carbonate fuel cell has the good effects that the electrolyte particles which are uniformly mixed are fully contacted with the surfaces of the binder particles, and the binder is fully and completely wrapped with the carbonate electrolyte particles after swelling in water by limiting the standing time; the effect of removing the excessive moisture in the carbonate electrolyte colloid is achieved through the limitation of the drying condition; the effect of pulverizing the dried colloid into uniform particles is achieved by the limitation of the pulverizing particle size; the hot-press molding conditions are limited, so that the uniform carbonate electrolyte colloid particles are hot-press molded at a certain temperature and pressure.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
This example provides a molten carbonate fuel cell electrolyte salt membrane, which is prepared as follows:
(1) 53 g of Li2CO347 g of K2CO3The electrolyte powder (molar ratio 68%: 32%) was mixed, and the weight ratio of the electrolyte powder to the water-soluble binder carboxymethylcellulose sodium (CMC) was 10: 1.
(2) 110 grams of electrolyte and binder powder weighed and 4 grams of deionized water were stirred and mixed for 1 hour and allowed to stand under sealed conditions for 15 hours.
(3) Drying the mixture of the electrolyte, the water-soluble binder and the water which is kept stand for 15 hours at 30 ℃ for 5 hours;
(4) crushing the mixture of the dried electrolyte, the water-soluble binder and water into powder with the particle size of about 50-60 um in a high-speed crusher;
(5) placing the crushed powder in an electrolyte grinding tool, hot-pressing at 90 ℃ under the pressure of 5MPa, and maintaining the pressure for 5min to obtain a salt film with the thickness of 0.9 mm;
(6) and (3) cooling the salt film prepared by hot pressing in an air drying oven at 30 ℃ for drying treatment, and sealing and storing after drying and forming.
Example 2
This example provides a molten carbonate fuel cell electrolyte salt membrane, which is prepared as follows:
(1) 53 g of Li2CO347 g of K2CO3The electrolyte powder (molar ratio 68%: 32%) was mixed, and the weight ratio of the electrolyte powder to the water-soluble binder polyvinyl alcohol (PVA) was 12: 1.
(2) A weighed amount of 108.3 grams of electrolyte and binder powder was mixed with 5.7 grams of deionized water under stirring for 2 hours and allowed to stand under sealed conditions for 20 hours.
(3) Drying the mixture of the electrolyte, the water-soluble binder and the water which is kept stand for 20 hours at 35 ℃ for 3 hours;
(4) crushing the mixture of the dried electrolyte, the water-soluble binder and water into powder with the diameter of about 60-80um in a high-speed crusher;
(5) placing the crushed powder in an electrolyte grinding tool, hot-pressing at 95 ℃ under the pressure of 7MPa, and maintaining the pressure for 3min to obtain a salt film with the thickness of 1 mm;
(6) and (3) cooling the salt film prepared by hot pressing in an air drying oven at 30 ℃ for drying treatment, and sealing and storing after drying and forming.
Example 3
This example provides a molten carbonate fuel cell electrolyte salt membrane, which is prepared as follows:
(1) 43 g of Li2CO357 g of Na2CO3The powders (52% by mole: 48%) were mixed with the electrolyte powder in a weight ratio of 13:1 to the water-soluble binder sodium carboxymethyl cellulose (CMC).
(2) A weighed amount of 107.7 grams of electrolyte and binder powder was mixed with 6.9 grams of deionized water with stirring for 2 hours and allowed to stand under sealed conditions for 20 hours.
(3) Drying the mixture of the electrolyte, the water-soluble binder and the water which is kept stand for 20 hours at 35 ℃ for 5 hours;
(4) crushing the mixture of the dried electrolyte, the water-soluble binder and water into powder with the particle size of about 50-80um in a high-speed crusher;
(5) placing the crushed powder in an electrolyte grinding tool, hot-pressing at 95 ℃ under the pressure of 8MPa, and maintaining the pressure for 4min to obtain a salt film with the thickness of 0.8 mm;
(6) and (3) cooling the salt film prepared by hot pressing in an air drying oven at 30 ℃ for drying treatment, and sealing and storing after drying and forming.
Example 4
This example provides a molten carbonate fuel cell electrolyte salt membrane, which is prepared as follows:
(1) 53 g of Li2CO347 g of K2CO3The electrolyte powder (molar ratio 68%: 32%) was mixed, and the weight ratio of the electrolyte powder to the water-soluble binder carboxymethylcellulose sodium (CMC) was 12.5: 1.
(2) A weighed amount of 108 grams of electrolyte and binder powder was mixed with 3.5 grams of deionized water with stirring for 2 hours and allowed to stand under sealed conditions for 18 hours.
(3) Drying the mixture of the electrolyte, the water-soluble binder and the water which is kept stand for 18 hours at 30 ℃ for 6 hours;
(4) crushing the mixture of the dried electrolyte, the water-soluble binder and water into powder with the diameter of about 60-80um in a high-speed crusher;
(5) placing the crushed powder in an electrolyte grinding tool, hot-pressing at 95 ℃ under the pressure of 5MPa, and maintaining the pressure for 5min to obtain a salt film with the thickness of 1 mm;
(6) and (3) cooling the salt film prepared by hot pressing in an air drying oven at 30 ℃ for drying treatment, and sealing and storing after drying and forming.
Example 5
This example provides a molten carbonate fuel cell electrolyte salt membrane, which is prepared as follows:
(1) 60 g of Li2CO347 g of K2CO3The electrolyte powder of (2) was mixed, and the weight ratio of the electrolyte powder to the water-soluble binder polyvinyl alcohol (PVA) was 11: 1.
(2) A weighed amount of 116.7 grams of electrolyte and binder powder was mixed with 6 grams of deionized water with stirring for 2 hours and allowed to stand under sealed conditions for 22 hours.
(3) Drying the mixture of the electrolyte, the water-soluble binder and the water which is kept stand for 22 hours at 35 ℃ for 5 hours;
(4) crushing the mixture of the dried electrolyte, the water-soluble binder and water into powder with the diameter of about 60-80um in a high-speed crusher;
(5) placing the crushed powder in an electrolyte grinding tool, hot-pressing at 90 ℃ under the pressure of 6MPa, and maintaining the pressure for 3min to obtain a salt film with the thickness of 0.9 mm;
(6) and (3) cooling the salt film prepared by hot pressing in an air drying oven at 30 ℃ for drying treatment, and sealing and storing after drying and forming.
Comparative example 1
This comparative example provides a molten carbonate fuel cell electrolyte salt membrane prepared as follows:
(1) 53 g of Li2CO347 g of K2CO3The electrolyte powder (molar ratio 68%: 32%) was mixed, and the weight ratio of the electrolyte powder to the water-soluble binder, sodium silicate (water glass) was 10: 1.
(2) 110 g of electrolyte and sodium silicate powder weighed and 4 g of deionized water were stirred and mixed for 1 hour, and then the mixture was allowed to stand for 15 hours under a sealed condition.
(3) Drying the mixture of the electrolyte, sodium silicate and water which is kept stand for 15 hours at 30 ℃ for 5 hours;
(4) crushing the dried electrolyte, sodium silicate and water mixture into powder with the particle size of 50-60 um in a high-speed crusher;
(5) placing the crushed powder in an electrolyte grinding tool, hot-pressing at 90 ℃ under the pressure of 6MPa, and maintaining the pressure for 5min to obtain a salt film with the thickness of 0.9 mm;
(6) and (3) cooling the salt film prepared by hot pressing in an air drying oven at 30 ℃ for drying treatment, and sealing and storing after drying and forming.
Comparative example 2
This comparative example provides a molten carbonate fuel cell electrolyte salt membrane prepared as follows:
(1) 53 g of Li2CO347 g of K2CO3The electrolyte powder (molar ratio 68%: 32%) was mixed, and the weight ratio of the electrolyte powder to the water-soluble binder polyvinyl alcohol (PVA) was 8: 1.
(2) The weighed 111.1 grams of electrolyte and binder powder was mixed with 7.7 grams of deionized water with stirring for 2 hours and allowed to stand under sealed conditions for 20 hours.
(3) Drying the mixture of the electrolyte, the water-soluble binder and the water which is kept stand for 20 hours at 35 ℃ for 3 hours;
(4) crushing the mixture of the dried electrolyte, the water-soluble binder and water into powder with the diameter of about 60-80um in a high-speed crusher;
(5) placing the crushed powder in an electrolyte grinding tool, hot-pressing at 95 ℃ under the pressure of 7MPa, and maintaining the pressure for 3min to obtain a salt film with the thickness of 1 mm;
(6) and (3) cooling the salt film prepared by hot pressing in an air drying oven at 30 ℃ for drying treatment, and sealing and storing after drying and forming.
Comparative example 3
This comparative example provides a molten carbonate fuel cell electrolyte salt membrane prepared as follows:
(1) 43 g of Li2CO357 g of Na2CO3The powders (52% by mole: 48%) were mixed with the electrolyte powder in a weight ratio of 13:1 to the water-soluble binder sodium carboxymethyl cellulose (CMC).
(2) A weighed amount of 107.7 grams of electrolyte and binder powder was mixed with 6.9 grams of deionized water with stirring for 2 hours.
(3) Putting the mixture of the electrolyte, the water-soluble binder and the water which are stirred and mixed for 2 hours into a water bath, adding 100 g of water, and stirring for 20 hours at 80 ℃;
(4) cooling the slurry obtained by heating and stirring in a water bath to room temperature, carrying out tape casting on a casting table to form the slurry with the thickness of 0.8mm, and drying for 15 h;
(5) and drying the salt film prepared by casting in an air drying oven at 30 ℃, and sealing and storing after drying and forming.
Comparative example 4
This comparative example provides a molten carbonate fuel cell electrolyte salt membrane prepared as follows:
(1) 53 g of Li2CO347 g of K2CO3The electrolyte powder (molar ratio 68%: 32%) was mixed in a weight ratio of 4:1 with polyvinyl butyral (PVB).
(2) A weighed amount of 108 grams of electrolyte and binder powder was mixed with stirring for 2 hours.
(3) Drying the mixture of the electrolyte and polyvinyl butyral (PVB) at 60 ℃ for 6 hours;
(4) placing the dried powder in an electrolyte grinding tool, hot-pressing at 95 ℃ under the pressure of 7MPa, and maintaining the pressure for 5min to obtain a salt film with the thickness of 1 mm;
(5) and (3) cooling the salt film prepared by hot pressing in an air drying oven at 30 ℃ for drying treatment, and sealing and storing after drying and forming.
Examples of the experiments
The salt film provided by the invention is subjected to performance tests, specifically comprises discharge voltage, power density, battery sealing performance and the like, and the specific test method comprises the following steps:
performance of operation
The electrolyte membrane material prepared by the embodiment of the invention is assembled with a diaphragm and an electrode to carry out a single cell experiment, and the single cell comprises an area of 225cm2The two end plates with gas flow field and inlet and outlet, anode with porosity of 50% (Cr-5%, Ni-95%), electrolyte diaphragm with pore size distribution of 0.1-0.5 micrometer and porosity of 50% (LiAlO)290 percent of the electrolyte membrane, 10 percent of the adhesive additive), and a cathode (Al-5 percent and Ni-95 percent) with the porosity of 60 percent, which are sequentially laminated and assembled with the assembly pressure of 2 MPa; the conditions for the single cell experiments were: the temperature is 650 ℃, hydrogen is introduced into the anode at a rate of 0.7L/min, air is introduced into the cathode at a rate of 1.8L/min, and carbon dioxide is introduced at a rate of 0.7L/min. The specific test results are as follows:
TABLE 1
The data in the table show that the discharge voltage, the power density and the sealing performance of the battery have great relation with the thickness of the carbonate electrolyte membrane under the condition that the new energy of the electrode diaphragm is consistent, which shows that the uniform and enough electrolyte can be completely filled in the pores of the diaphragm and form a good three-phase reaction interface with the electrode, and excellent discharge performance and sealing performance are obtained. As can be seen from comparative example 1 in the table, although water glass is dissolved in water and forms a salt film with carbonate, the water glass is difficult to decompose, and colloidal substances formed with the carbonate influence the melting of the carbonate, so that the battery performance is poor, in comparative example 2, the binder is excessive, although the salt film is formed, the excessive binder is not completely decomposed in the experiment, and carbon deposition phenomenon exists in the diaphragm, so that the battery voltage is normal, but the discharge performance is poor; comparative example 3, the salt film is prepared from the slurry, the test result is similar to that of example 3, but the density of the tape casting film is smaller than that of the hot-pressing method, the electrolyte film has a loose structure, the electrolytic quality is less, the battery performance is reduced, and the sealing performance is poor; comparative example 4 adopts a polyvinyl butyral (PVB) binder which is difficult to decompose, PVB is not completely decomposed in the battery sintering process, and the battery has serious carbon deposition, so that the discharge voltage and the performance of the battery are poor.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. An electrolyte salt membrane of a molten carbonate fuel cell is characterized by comprising the following components in parts by weight: 9-13 parts of electrolyte and 1 part of water-soluble binder;
wherein the water-soluble adhesive has water-swelling properties.
2. The molten carbonate fuel cell electrolyte salt film of claim 1, wherein the water-soluble binder is at least one of methylcellulose, sodium carboxymethylcellulose, polyvinyl alcohol, and hydroxypropylmethylcellulose.
3. The molten carbonate fuel cell electrolyte salt film of claim 1, wherein the electrolyte is a mixture of lithium carbonate and potassium carbonate or a mixture of lithium carbonate and sodium carbonate.
4. The molten carbonate fuel cell electrolyte salt membrane of claim 3, wherein the electrolyte comprises a molar ratio of 68%: 32% of lithium carbonate and potassium carbonate,
alternatively, a molar ratio of 52%: 48% of lithium carbonate and sodium carbonate.
5. A method of making a molten carbonate fuel cell electrolyte salt membrane according to any of claims 1 to 4, comprising the steps of:
uniformly mixing electrolyte powder and water-soluble binder powder to obtain powder;
adding water accounting for 3-7% of the powder into the obtained powder, stirring and mixing, sealing and standing, and drying to obtain a mixture;
and crushing the obtained mixture, performing hot-press molding and drying to obtain the electrolyte salt membrane of the molten carbonate fuel cell.
6. The method of making a molten carbonate fuel cell electrolyte salt membrane according to claim 5, wherein the sealing rest time is 12-24 hours.
7. The method of preparing a molten carbonate fuel cell electrolyte salt membrane in accordance with claim 5, wherein the drying is performed at a temperature of 30-35 ℃ for 3-8 hours.
8. The method of making a molten carbonate fuel cell electrolyte salt membrane according to claim 5, wherein the blend is pulverized to 50-100 μm.
9. The method of preparing an electrolyte salt membrane for a molten carbonate fuel cell according to claim 5, wherein the hot press molding is performed at a temperature of 80-95 ℃, under a pressure of 5-8MPa, and for a dwell time of 3-5 min.
10. The method of making a molten carbonate fuel cell electrolyte salt membrane according to any of claims 5 to 9, wherein the stirring and mixing time is 1 to 2 hours.
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