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Integral composite membrane with a continuous ionomer phase

A technology of composite membranes and ionomers, applied in the direction of organic diaphragms, diaphragms, structural parts, etc., can solve problems such as structural failure

Active Publication Date: 2021-03-16
WL GORE & ASSOC INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these ionomer thin film composite membranes may suffer from premature structural failure in flow battery applications

Method used

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  • Integral composite membrane with a continuous ionomer phase
  • Integral composite membrane with a continuous ionomer phase
  • Integral composite membrane with a continuous ionomer phase

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0089] c. Preparation and application of impregnating agent solution

[0090] Referring again to steps 342, 362 and 322, more details regarding the preparation of the impregnant solution and application to the support structure are described next.

[0091] The impregnant solution is prepared by dissolving the ion exchange material in a solvent. The impregnant solution contains the ion exchange material, and optionally other components, such as surfactants, in a solvent. The ion exchange material is a cation exchange material, an anion exchange material or an ion exchange material having both cation and anion exchange capabilities. The choice of solvent will depend in part on the composition of the impregnating agent and the composition of the porous substrate.

[0092] The impregnant solution can be applied to the untreated porous substrate as a layer of controlled thickness by single-pass ionomer coating techniques including forward roll coating, reverse roll coating, gra...

Embodiment 11

[0154] A 26.7 μm thick composite membrane consisting of an ion-exchange polymer perfluorosulfonic acid resin with an EW of 920 g / (molar acid equivalent) reinforced with two layers of expanded porous ePTFE membrane #5 was prepared using conventional laboratory techniques. First, a water-ethanol-based solution of perfluorosulfonic acid resin (product FSS2, provided by Asahi Glass Company) with EW=920 g / molar equivalent was coated on a moving carrier substrate using a slot die, and the Lamination of ePTFE membrane #5 moving in the same direction. The carrier substrate was a polymer sheet (obtained from DAICEL VALUECOATING LTD.), comprising PET and a cycloolefin copolymer (COC) protective layer, and oriented with the COC side on top. Subsequently, the laminate was dried in an oven at 160 °C and annealed at this temperature for 1 min, resulting in a solid coated structure comprising a support substrate attached to a polymer layer reinforced with expanded porous PTFE .

[0155] Th...

Embodiment 12

[0158] A 44.2 μm thick composite membrane consisting of an ion-exchange polymer perfluorosulfonic acid resin with an EW of 810 g / (molar acid equivalent) reinforced with a layer of expanded porous ePTFE membrane #2 was prepared using conventional laboratory techniques. First, the water-ethanol base of ion-exchange perfluorosulfonic acid resin (from Shanghai Gore 3F Fluoromaterials Co., LTD., The solution was coated on a carrier substrate constrained in a frame and laminated with ePTFE membrane #2. The carrier substrate was a polymer sheet (obtained from Daicel Investment Co., Ltd., Japan) comprising PET and a cycloolefin copolymer (COC) protective layer, and oriented with the COC side on top. The laminate was then dried in an oven at 160° C. and annealed at this temperature for 1 minute. Then, another amount of water-ethanol-based solution of the same perfluorosulfonic acid resin was applied to the coated structure using a pull-down rod, dried again at 160 °C, and annealed at ...

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Abstract

Embodiments are directed to composite membranes having a microporous polymer structure, and an ion exchange material forming a continuous ionomer phase within the composite membrane. The continuous ionomer phase refers to absence of any internal interfaces in a layer of ionomer or between any number of layers coatings of the ion exchange material provided on top of one another. The composite membrane exhibits a haze change of 0% or less after being subjected to a blister test procedure. No bubbles or blisters are formed on the composite membrane after the blister test procedure. A haze value of the composite membrane is between 5% and 95%, between 10% and 90% or between 20% and 85%. The composite membrane may have a thickness of more than 17 microns at 0% relative humidity.

Description

[0001] field of invention [0002] The present invention relates to monolithic composite membranes, and more particularly to composite membranes having a continuous ionomeric phase. [0003] Background of the invention [0004] Composite membranes such as anionic, cationic and amphoteric composite membranes can be used in a variety of applications. For example, a composite membrane is an integral part of a polymer electrolyte fuel cell, where the composite membrane is located between the cathode and anode, and transports protons formed near the catalyst at the hydrogen electrode to the oxygen electrode, allowing Get current. These polymer electrolyte fuel cells are particularly advantageous because they operate at lower temperatures than other fuel cells. Also, these polymer electrolyte fuel cells do not contain any of the corrosive acids found in phosphoric acid fuel cells. [0005] Composite membranes may also be used in electrochemical devices, such as electrolytic cells ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/411H01M50/449H01M50/403H01M8/18H01M50/489H01M50/491
CPCH01M8/0241H01M8/0239H01M8/18H01M8/188Y02E60/10H01M50/403Y02E60/36H01M50/491H01M50/489Y02E60/50H01M8/1041H01M8/1058H01M8/1067H01M8/106H01M8/1053H01M8/1081H01M8/1039H01M8/109C25B1/04C25B13/02C25B13/08H01M8/0243H01M8/0245H01M8/1009H01M8/1044H01M8/1062H01M2008/1095
Inventor A·阿加波夫铃木健之
Owner WL GORE & ASSOC INC