Block Copolymer Electrolyte for Low-Humidity Proton Conductivity

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Solution Overview

Problem

Conventional block copolymers and polymer electrolyte materials exhibit insufficient power generation performance and mechanical strength under low-humidity conditions, limiting their industrial applicability.

Innovation Solution

A block copolymer with specific molecular weight ratios and structural components, including an ionic segment with a molecular weight of 40,000 to 50,000 and a nonionic segment, achieving a molecular weight ratio greater than 1.5, and possessing a crystalline structure, enhances power generation performance and mechanical strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional block copolymers are used as polymer electrolyte materials, then they provide basic power generation performance, but their power generation performance and mechanical strength are insufficient under low-humidity conditions

Engineering Contradiction:

Improvepower generation performance under low-humidity conditionsVSAvoidindustrial applicability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The invention changes the molecular weight parameter of the ionic segment to a specific range (40,000-50,000) and adjusts the molecular weight ratio between ionic and nonionic segments to greater than 1.5. These parameter optimizations resolve the contradiction by enhancing power generation performance under low-humidity conditions while maintaining industrial processability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite block copolymer structure combining ionic segments (aromatic hydrocarbon polymer with ionic groups) and nonionic segments in a specific molecular weight ratio. This composite structure achieves both high reliability under low-humidity conditions and good adaptability for industrial application

Inventive Principle:

Principle #40Composite materials

2Reliability

If the molecular weight of the ionic segment is increased to enhance power generation performance, then power generation performance improves, but processability deteriorates

Engineering Contradiction:

Improvepower generation performanceVSAvoidin-process capability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention identifies and optimizes the molecular weight parameter of the ionic segment within the specific range of 40,000-50,000. This precise parameter control resolves the contradiction by achieving high power generation performance while maintaining excellent processability, as molecular weights outside this range would compromise either performance or manufacturability

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the molecular weight ratio Mn3/(Mn1+Mn2) is increased to enhance power generation performance under low-humidity conditions, then reliability improves, but the structural complexity increases

Engineering Contradiction:

Improvepower generation performance under low-humidity conditionsVSAvoidmolecular weight ratio control

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention establishes a specific parameter threshold (molecular weight ratio Mn3/(Mn1+Mn2) > 1.5) that balances performance enhancement with structural manageability. This clear parameter specification resolves the contradiction by providing a straightforward design criterion that achieves high reliability without excessive structural complexity

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260078218A1Block copolymer, polymer electrolyte material using same, polymer electrolyte molded article, polymer electrolyte membrane, catalyst-coated electrolyte membrane, membrane electrode composite body, solid polymer fuel cell, and water electrolytic hydrogen generator

Publication Date: 2026.03.19 TORAY INDUSTRIES INC

AI summary

A block copolymer including one or more segments containing an ionic group (hereinafter referred to as an “ionic segment(s)”) and one or more segments containing no ionic group (hereinafter referred to as a “nonionic segment(s)”), wherein the ionic segment has an aromatic hydrocarbon polymer having a number-average molecular weight of more than 40,000 and 50,000 or less, and wherein the block copolymer satisfies the relation of: Mn3/(Mn1+Mn2)>1.5, wherein Mn1 represents the number-average molecular weight of the ionic segment, Mn2 represents the number-average molecular weight of the nonionic segment, and Mn3 represents the number-average molecular weight of the block copolymer. Provided is a block copolymer and a polymer electrolyte material produced using the same, wherein the block copolymer has excellent proton conductivity even under low-humidity conditions, has excellent mechanical strength and physical durability, and has an excellent in-process capability.