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Method for preparing diaphragm of molten carbonate fuel cell

A technology of molten carbonate and fuel cells, which is applied in the direction of molten electrolyte fuel cells, fuel cell parts, battery pack parts, etc. The effect of severe pollution

Inactive Publication Date: 2005-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 4. During hot pressing, it is difficult to press the diaphragm even under high pressure;
[0012] 5. The diaphragm needs to be stored in special dry equipment

Method used

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  • Method for preparing diaphragm of molten carbonate fuel cell
  • Method for preparing diaphragm of molten carbonate fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: Ingredients according to the recipe:

[0057] α-LiAlO 2 : 45.0 g (coarse material (particle size > 1 μm) 95%, fine material (particle size < 1 μm) 5%)

[0058] Polyvinyl alcohol (PVA): 9.0 grams

[0059] Lactic acid: 2.3 grams

[0060] Glycerin and triacetin and glycol mixture (1 / 4 and 1 / 3 each of glycerin and triacetin): 5.0 g

[0061] Polyether compound: 0.8 g

[0062] Water: α-LiAlO 2 4.0 times of powder

[0063] The order of feeding and the process flow of film making are according to figure 1 conduct. After hot pressing, the thickness of the battery separator is 0.69mm, and the bulk density is 1.84g / cm 3 .

[0064] The film test samples were prepared by simulating the conditions of slow battery heating and oxygen ventilation. It is measured that the maximum pore diameter is less than or equal to 1 μm, and the porosity is greater than or equal to 50%.

[0065] A battery is assembled with such a membrane, a sintered porous nickel plate as the ca...

Embodiment 2

[0067] According to the above formula ingredients, press figure 1 Sequence of addition and process flow to prepare the separator. After hot pressing, the thickness of the diaphragm is 0.74mm, and its bulk density is 1.81g / cm 3 . Then assemble and operate the single cell according to the above conditions. at 200 and 392.9mA / cm 2 Discharge, the battery output voltage is 0.882 and 0.638V respectively.

Embodiment 3

[0069] According to the above film-making formula ingredients, press figure 1 Sequence of addition and process flow to prepare the separator. It can be stored after being hot-pressed, or directly stored without hot-pressing after baking in an oven (when hot-pressing is required later, it can be baked in an oven at 60-70°C for 1 hour and then hot-pressed). The separator obtained above was stored at room temperature and air for more than one month, and then the single cell was assembled and operated according to the above conditions. at 200 and 300mA / cm 2 Discharge, the battery output voltage is 0.817 and 0.677V respectively. Compared with separators prepared with organic solvents and stored at room temperature and in air for the same period of time, the electrochemical performance of the separators prepared in water was much higher.

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Abstract

A preparation method of melting carbonate fuel battery membrane, including slurry preparation, molding, drying and heat pressure processes. The method characterized in that the slurry uses water as the solvent, PVA as agglomerate, lactic acid as the dispersing agent, glycerin and mixture of triacetin and ethanediol as DBP, ºÐ-LiALO2 as the powder. The formulation is weight share, powder: 45.0 share, the grain size > 1mum of coarse powder 80-95%, the grain size < 1mum of slender powder 5-20%; the agglomerate: 7.0-12.0 share; the dispersing agent:1.5-3.0 share; the DBP: 4.0-8.0 share; the solvent: 2.5-4.5 times of the powder. The invention use water as solvent to get the homogeneous membrane with high mechanical intensity. The void ratio >=50%, the film resist of the battery is relatively high (>=0.9 MPa), the biggest aperture is <= 1mum, and meanwhile has high electric chemical performance and the chemical performance is not lower than the membrane manufactured by the organic solvent.

Description

Technical field: [0001] The invention belongs to the technical field of fuel cells, and particularly provides a method for preparing a molten carbonate fuel cell diaphragm. Background technique: [0002] At present, molten carbonate fuel cells are in the commercialization stage in the world, and some countries are solving technical problems in the commercialization process. In the process of preparing battery separators, the tape casting method is commonly used to make membranes, and a large amount of organic solvents, such as n-butanol, ethanol and chloroform, are used. Although these organic solvents are low-toxic, their use in large quantities will cause serious harm to the human body and serious pollution to the surrounding environment. In order to overcome these problems, some countries such as the United States replace organic solvents with water and still use the tape casting method to make membranes. Such as: [0003] Document 1. Method of making matrix for carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/14
CPCY02E60/50Y02P70/50
Inventor 林化新程谟杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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