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Preparation method of a non-hydrated proton exchange membrane for reducing methanol permeability

A proton exchange membrane, non-hydration technology, used in fuel cell parts, solid electrolyte fuel cells, structural parts, etc., can solve problems such as reducing methanol permeation, and achieve the effect of reducing methanol permeation

Inactive Publication Date: 2009-12-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The research of Sekhon, Fernicola in Italy and Lee et al. in Korea (Sekhon S S, Krishnan P.Singh B, et al. Proton conducting membrane containing room temperature ionic liquid. Electrochimica Acta, 2006, 52 (4): 1639-1644; Sekhon S S, Hundal M S, Park G G, et al.Non-aqueous polymer electrolytes containing room temperature ionic liquid: 2,3-dimethyl-1-octylimidazolium tetrafluoroborate. Solid State Ionics, 2007, 178: 1404-1410; Fernicola A, Panero S , Scrosati B. Proton-conducting membranes based on protic ionic liquids. Journal of Power Sources, 2008, 178 (2): 591-595; Kim K S, Park S Y, Lee H, et al. Ionic liquid-polymer gel electrolytes based on morpholinium salt andP(VdF-HFP)copolymer.Journal of Power Sources, 2006,155(2):385-390) shows that the polyvinylidene fluoride-hexafluoropropylene copolymer P(VdF-HFP) composite film based on ionic liquid can be used at higher temperature However, the preparation method has not been improved from the perspective of reducing methanol penetration, in order to effectively reduce methanol penetration while ensuring conductivity.

Method used

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  • Preparation method of a non-hydrated proton exchange membrane for reducing methanol permeability
  • Preparation method of a non-hydrated proton exchange membrane for reducing methanol permeability
  • Preparation method of a non-hydrated proton exchange membrane for reducing methanol permeability

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1. Mix P(VdF-HFP) and solvent (Ac+NMP) uniformly to obtain a colorless and transparent solution of P(VdF-HFP) with a mass percentage of 11%, wherein the percentage of NMP is 3.1%.

[0021] 2. Heat the colorless solution in step 1 to 55° C., stir and reflux at constant temperature for 6 hours to obtain a colorless transparent viscous solution.

[0022] 3. Slowly add the non-hydrated proton electrolyte ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate into the solution obtained in step 2, so that the percentage of the ionic liquid is 4%, and the system is ultrasonically Treat for 10 min to mix well.

[0023] 4. Stir the colorless and transparent solution obtained in step 3 at constant temperature for 2.5 hours, and then lower the temperature to 25°C to obtain a viscous, colorless and homogeneous casting solution.

[0024] 5. Cast the viscous solution obtained in step 4 into a Petri dish, and after the solvent evaporates, dry the obtained polymer film in a vacuum...

Embodiment 2

[0027] 1. Mix P(VdF-HFP) and solvent (Ac+NMP) uniformly to obtain a colorless and transparent solution of P(VdF-HFP) with a mass percentage of 9%, wherein the percentage of NMP is 4%.

[0028] 2. Heat the colorless solution in step 1 to 60° C., stir and reflux at constant temperature for 4 hours to obtain a colorless transparent viscous solution.

[0029] 3. Slowly add the non-hydrated proton electrolyte ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate into the solution obtained in step 2, so that the percentage of the ionic liquid is 7%, and the system is ultrasonically Treat for 10 min to mix well.

[0030] 4. Stir the colorless and transparent solution obtained in step 3 at constant temperature for 3 hours, and then lower the temperature to 25° C. to obtain a viscous colorless homogeneous casting solution.

[0031] 5. Cast the viscous solution obtained in step 4 into a Petri dish. After the solvent evaporates, dry the obtained polymer film in a vacuum oven at 70°...

Embodiment 3

[0034] 1. Mix P(VdF-HFP) and solvent (Ac+NMP) uniformly to obtain a colorless and transparent solution of P(VdF-HFP) with a mass percentage of 6.25%, wherein the percentage of NMP is 6.25%.

[0035] 2. Heat the colorless solution in step 1 to 50° C., stir and reflux at a constant temperature for 2 hours to obtain a colorless transparent viscous solution.

[0036] 3. Slowly add the non-hydrated proton electrolyte ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate into the solution obtained in step 2, so that the percentage of the ionic liquid is 11%, and the system is ultrasonically Treat for 10 min to mix well.

[0037] 4. Stir the colorless and transparent solution obtained in step 3 at constant temperature for 3 hours, and then lower the temperature to 25° C. to obtain a viscous colorless homogeneous casting solution.

[0038] 5. Cast the viscous solution obtained in step 4 into a Petri dish. After the solvent evaporates, dry the obtained polymer film in a vacuum ov...

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Abstract

The invention discloses a preparation method of a non-hydrated proton exchange membrane for reducing methanol permeability, relating to the preparation technology of fuel cell material. The preparation method comprises the following steps: adopting an in situ composite method to realize organic complex of non-hydrated electrolyte and macromoleclar polymer base material, mixing polyvinylidene fluoride-tetrafluoroethylene copolymer and solvent acetone+N-methyl pyrrolidone evenly, then heating, adding non-hydrated proton electrolyte ion liquid 1-ethyl-3-methyl imidazolium fluoborate and obtaining the non-hydrated proton exchange membrane with uniform structure and high electrical conductivity. The preparation method not only adopts the non-hydrated proton electrolyte ion liquid as membrane electrolyte, not only improves the use temperature of a composite membrane, simultaneously adopts a mixed solvent method in the preparation process, and greatly reduces transmission of finished composite membrane methanol by only needing to add another high-boiling solvent under the condition of keeping high electrical conductivity.

Description

technical field [0001] The invention belongs to the technical scope of fuel cell material preparation, and in particular relates to a preparation method of a proton exchange membrane capable of reducing methanol permeation. Background technique [0002] Due to the advantages of high energy density, low temperature operation, abundant methanol source, no need for fuel reformation, easy portability and storage, and zero or low emission, direct methanol fuel cell (DMFC) has broad application in portable power supply, electric vehicles and other fields. Application prospects. As a key component of DMFC, the proton exchange membrane directly determines the performance of the battery. At present, the commercial membrane of DMFC is a perfluorosulfonic acid type proton exchange membrane, such as Du Port's membrane. The hydrogen ions in the interior of this type of membrane are formed as hydrated protons H 3 o + During the transfer process, the hydrated proton jumps from one fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08L27/16C08L27/20C08K5/3445H01M8/02H01M2/16H01M8/10H01M8/0202H01M8/1004
CPCY02E60/12Y02E60/523Y02E60/50
Inventor 王新东苗睿瑛叶锋方勇王同涛唐玲李建玲赵海雷
Owner UNIV OF SCI & TECH BEIJING
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