Polyelectrolyte film, film-electrode assembly, and solid-polymer-type fuel cell

A technology of electrolyte membrane and polymer, applied in the direction of solid electrolyte fuel cells, fuel cell parts, non-metallic conductors, etc., can solve problems such as electrolyte membranes that have not yet been obtained, and achieve good adhesion, high ionic conductivity, excellent performance effect

Inactive Publication Date: 2009-03-11
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Non-Patent Document 3 describes that compared with perfluorocarbon sulfonic acid polymer electrolyte membrane, sulfonated polystyrene-block-polyisobutylene-block-polystyrene triblock copolymer (sul

Method used

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  • Polyelectrolyte film, film-electrode assembly, and solid-polymer-type fuel cell
  • Polyelectrolyte film, film-electrode assembly, and solid-polymer-type fuel cell
  • Polyelectrolyte film, film-electrode assembly, and solid-polymer-type fuel cell

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0053] Embodiment 1 (alkyl substitution)

[0054] This embodiment is such that the above-mentioned basic embodiment is further embodied, and is most characterized in that in the aromatic vinyl compound unit as a unit (= repeating unit) in the polymer block (A) , at least one hydrogen atom directly bonded to the aromatic ring is replaced by an alkyl group having 1 to 8 carbon atoms. The polymer electrolyte membrane including the block copolymer containing the polymer block (A) of Embodiment 1 as a main component is specifically characterized in that it has a low methanol permeability and is excellent in methanol barrier performance.

[0055] In this embodiment, the polymer block (A) can be defined as a polymer block (A1) having an aromatic vinyl compound unit represented by the following general formula (I) as a main unit

[0056]

[0057] where Ar 1 represents an aryl group having 6 to 14 carbon atoms substituted by an alkyl group having 1 to 8 carbon atoms and which ma...

Embodiment approach 2

[0071] Embodiment 2 (constraint phase)

[0072] In Embodiment 2 of the present invention, the polymer block (A) has a polymer block (A2b) in addition to the polymer block (A2a) with an ion-conducting group, and the polymer block (A2b ) is a polymer block (A2b1) or a crystalline polyolefin block having an aromatic vinyl compound unit as a main unit, and forms a constrained phase (a phase that functions to maintain the phase-separated structure of the block copolymer). As described in the Background Art section, in a polymer electrolyte fuel cell, a change in humidity easily occurs between an operation period and a stop period, and thus a small change in size and / or a change in dynamic characteristics (tensile strength, etc.) are sought at the same time. A small polymer electrolyte membrane, in addition, in which, in a direct methanol polymer electrolyte fuel cell, characteristics between before and after power generation corresponding to before and after immersion treatment i...

Embodiment approach 3

[0104] Embodiment 3 (crosslinking)

[0105] In this embodiment of the invention, the polymer block (A1) in embodiment 1 is self-crosslinked, and the polymer block (A2a) in embodiment 2 is self-crosslinked. This crosslinking is made intermolecular and / or intramolecular. The polymer electrolyte membrane comprising the block copolymer of the present embodiment as a main component is specifically characterized in that there is little change in characteristics such as methanol permeability and ion conductivity between before and after immersion in a methanol solution, and it can be used over a long period of time. exhibited stable performance over time.

[0106] As means for crosslinking, there are crosslinking methods using polyamines, radical crosslinking methods, etc., and any of them may be used, but since crosslinking is usually performed simultaneously with or after the preparation of the polymer electrolyte membrane , so the crosslinking will be described later in the de...

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Abstract

The invention relates to polymer electrolyte membrane, and membrane electrode assembly employing the membrane and solid polymer type fuel cell. A polymer electrolyte membrane comprising as a main ingredient a block copolymer which comprises, as its constituents, a polymer block (A) having as a main unit an aromatic vinyl compound unit and a polymer block (B) forming a flexible phase, and has ion-conducting groups on the polymer block (A), said aromatic vinyl compound unit being such that the hydrogen atom bonded to the alpha-carbon atom is replaced with an alkyl group or an aryl group optionally having substituent(s), and at least one of hydrogen atoms directly bonded to the aromatic ring is replaced with an alkyl group; and a membrane electrode assembly and a polymer electrolyte fuel cell both of which uses it. The polymer block (A) can further have a restraining phase, and/or can be cross-linked. The electrolyte membrane is mild to the environment, has a high ion conductivity and good bonding properties to electrodes, is excellent in moldability, and is not easily influenced by methanol; and displays excellent performance in polymer electrolyte fuel cells, particularly direct methanol fuel cells.

Description

technical field [0001] The present invention relates to a polymer electrolyte membrane used in a polymer electrolyte fuel cell, preferably a polymer electrolyte direct methanol fuel cell, and a membrane electrode assembly and a fuel cell using the polymer electrolyte membrane. Background technique [0002] In recent years, fuel cell technology has attracted attention as a fundamental solution to energy and / or environmental problems, and further as a central energy conversion system in the future hydrogen era. In particular, polymer electrolyte fuel cells (PEFCs) have been attempted to be used as electric vehicle power sources, portable device power sources, and further applied to household stationary power devices utilizing both electricity and heat due to enabling miniaturization and weight reduction, and the like. [0003] A polymer electrolyte fuel cell generally consists of the following. First, catalyst layers containing a platinum group metal catalyst supported on car...

Claims

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Application Information

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IPC IPC(8): H01M8/02C08F297/00C08J5/22H01B1/06H01M8/10
CPCY02E60/523Y02E60/50
Inventor 小野友裕中井慎二大木弘之仲野武史
Owner KURARAY CO LTD
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