Oxygen Permeable Membrane Joining Strength
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Solution Overview
Problem
Conventional air secondary batteries face issues with insufficient joining strength between the oxygen-permeable membrane and the armouring sheet, leading to electrolyte leakage and water penetration, which shortens the battery's lifespan.
Innovation Solution
An oxygen-permeable membrane made of a thermoplastic resin with inorganic particles having pore diameters of 10 Å or less, combined with a hydrophobic treatment on one surface, is used, and an armouring material with a laminated structure that includes a heat-resistant resin film, metal foil, and a thermoplastic resin film, where the oxygen-permeable membrane is joined to the inner layer side of the armouring sheet, enhancing the joining performance and water-barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous ceramic material is used as an oxygen-permeable membrane, then oxygen permeability is achieved, but joining strength with the armouring sheet becomes insufficient
Solution Approach 1:
The patent uses a composite membrane structure combining a porous base layer (for oxygen permeability) with a hydrophobic coating layer (for water barrier and improved joining). This composite approach allows the membrane to simultaneously achieve gas permeability through the porous structure while the hydrophobic coating provides water resistance and enhanced adhesion to the armouring sheet, resolving the contradiction between oxygen permeability and joining strength.
Solution Approach 2:
The patent employs a porous membrane material that allows oxygen to pass through while maintaining structural integrity for joining. The porous structure enables oxygen permeability, and when combined with hydrophobic treatment, creates a material that can be effectively joined to the armouring sheet while maintaining its gas transport function.
2Ease of manufacture
If the armouring sheet structure is simplified, then manufacturing ease is improved, but water barrier property deteriorates
Solution Approach 1:
The patent applies hydrophobic treatment specifically to the oxygen-permeable membrane and its joining regions, rather than treating the entire armouring sheet. This localized approach provides water barrier protection exactly where needed (at the membrane-armouring interface and membrane surface) while keeping the rest of the armouring sheet structure simple and easy to manufacture.
Solution Approach 2:
The patent changes the surface property parameter of the oxygen-permeable membrane by applying hydrophobic treatment, which modifies the surface energy and water contact angle. This parameter change provides water barrier functionality without altering the basic armouring sheet structure, maintaining manufacturing simplicity while preventing water penetration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents electrolyte leakage and water penetration while maintaining high oxygen permeability, resulting in an air secondary battery with improved performance and extended lifespan.
Implementation Method 1
inorganic particles having pores having pore diameter of 10 Å or less contained in the thermoplastic resin membrane
Implementation Method 2
the thermoplastic resin membrane has one surface on which hydrophobic treatment is effected
Data Source
AI summary
Provided is an oxygen permeable membrane for use in an air secondary battery, which excels in oxygen permeability, barrier performance to water, being capable of preventing electrolyte from leaking out. Such an oxygen permeable membrane includes a thermoplastic resin membrane and inorganic particles having pores having pore diameter of 10 Å or less contained in the thermoplastic resin membrane, in which the thermoplastic resin membrane has one surface on which hydrophobic treatment is effected.