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Preparation method of filled proton exchange membrane

A technology of proton exchange membrane and filling type, which is applied in the field of fuel cell cation exchange membrane preparation, can solve the problems of restricting large-scale development, fuel penetration, and reducing battery life, and achieve thermal stability and hydrolysis stability improvement, proton conductivity Improve the effect of novel membrane material structure

Active Publication Date: 2021-07-13
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polyethersulfone (PES) has excellent creep resistance and dimensional stability at high temperatures. The proton exchange membrane prepared by blending sulfonated polymers with non-sulfonated polyethersulfone has a large number of micropore structures inside. Provide a storage space for a large number of water molecules, but the proton exchange membrane obtained by this method has a high methanol permeability due to the existence of pores, which is easy to cause fuel penetration, pollute the electrode and reduce battery life
Just as Nafion has a high methanol permeability, it is very easy to lose water under high temperature conditions, which is the most important factor limiting its large-scale development

Method used

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  • Preparation method of filled proton exchange membrane
  • Preparation method of filled proton exchange membrane
  • Preparation method of filled proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Preparation of sulfonated polyarylethersulfone / polyethersulfone microporous membrane (S30-20)

[0029] At 60°C, add 4.9g of SPAES30 and 19.6g of PES dissolved in 75.5g of DMAc solvent into a dry round bottom flask, stir for 24h, and ultrasonically defoam to obtain a casting solution. Take a dry and clean glass plate, pour the solution evenly on it, and push it evenly and slowly with a glass rod to form a thin film. In an indoor environment with a humidity of about 40%, place it for 10 seconds, and then put the glass plate into deionized water. After the film is formed, rinse it repeatedly with deionized water to remove excess solvent. Soak the membrane in deionized water, isopropanol (IPA), and 1mol / L HCl for 24 hours respectively. When changing the solvent, wash off the original solvent on the membrane to obtain sulfonated polyarylethersulfone / polyether Sulfone microporous membrane, named S30-20.

Embodiment 2～6

[0030] The preparation of embodiment 2~6 microporous membrane S30-30, S30-40, S40-20, S40-30 and S40-40

[0031] The preparation method of microporous membrane S30-30, S30-40, S40-20, S40-30, S40-40 is similar to that of microporous membrane S30-20, the difference is that L-SPAES with different sulfonation degrees and PES The blending ratios are different, and the specific feed ratios are listed in Table 1.

[0032] The specific feed ratio of table 1 microporous membrane

[0033]

[0034] Table 2 lists the basic properties of S30-20, S30-30, S30-40, S40-20, S40-30, and S40-40. The actual IEC value of the film measured by acid-base titration is 0.21- 0.58mmol / g, the swelling rate at room temperature is 0.2%-2.15%, the water absorption rate increases from 64.1% to 122.8% at 30°C, and increases with the increase of temperature, under the premise of maintaining the dimensional stability of the film The water absorption rate is greatly improved, which is conducive to the stora...

Embodiment 7

[0035] The preparation of embodiment 7 filled film S30-20+F50

[0036] Dissolve SPAES50 in aqueous DMF (V DMF :V DI Water =3:2), the concentration was 5%, to obtain a polymer solution. Spread the S30-20 microporous membrane in a vacuum suction filtration device, infiltrate the polymer solution for a short time within 15s, dry and rinse, repeat three times, and dry the membrane in a vacuum oven at 45°C. The dried membrane was treated with hydrochloric acid, the pores were shrunk by isopropanol, rinsed repeatedly with deionized water, and dried naturally to obtain a filled proton exchange membrane named S30-20+F50.

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Abstract

The invention discloses a preparation method of a filled proton exchange membrane. In the method, a microporous base membrane is prepared by using sulfonated polyarylether sulfone with a low degree of sulfonation and polyether sulfone through a phase inversion method, and the micropores are filled with sulfonated polyarylether with a high degree of sulfonation by a vacuum filtration filling method. Sulfone, to obtain a packed proton exchange membrane. The preparation process of the present invention is simple, and the obtained proton exchange membrane is uniform and transparent in shape, and the material with high conductivity is filled in the microporous membrane. On the other hand, filling the pores greatly blocks the penetration of fuel and improves the comprehensive performance of the filled proton exchange membrane.

Description

technical field [0001] The invention belongs to the technical field of fuel cell cation exchange membrane preparation, and relates to a preparation method of a filled proton exchange membrane. Background technique [0002] The proton exchange membrane is the most important component in the fuel cell. Common proton exchange membranes include DuPont's perfluorosulfonic acid proton exchange membrane (Nafion), but Nafion membranes suffer from severe water loss at high temperatures, high methanol permeability and high cost. Such defects limit its large-scale commercialization. Hydrocarbon-based proton exchange membranes have attracted extensive attention due to their outstanding advantages such as low price and stable physical and chemical properties. Common hydrocarbon polymers include sulfonated polyketone (SPK), sulfonated polyaryletherketone (SPAEK), sulfonated polyaryletherketone (SPAES), sulfonated polyaryletherketonesulfone (SPAEKS), etc. However, increasing the conducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1069H01M8/1072H01M8/1081H01M8/1086
CPCY02E60/50
Inventor 陈守文朱雨昕胡朝霞陆瑶李娜
Owner NANJING UNIV OF SCI & TECH
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