Multi-layer Composite Getter for Electrochemical Devices
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Solution Overview
Problem
Existing multi-layer metal getter materials for electrochemical devices face issues such as limited capacity due to polymeric limitations, fragility, and reduced hydrogen sorption efficiency, especially under abnormal conditions like reversed current flow or elevated temperatures, which can lead to device breakage and safety risks.
Innovation Solution
A multi-layer composite getter system with a metal getter support coated with palladium or palladium-based composites and a hydrogen-permeable polymeric layer containing auxiliary getter materials, where the polymeric layer covers at least 80% of the surface, enhancing hydrogen removal and sorption of additional harmful species like H2O and CO2.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric multi-layer systems with dispersed getter material are used, then the getter is protected from electrolyte contact, but the amount of getter material is limited and hydrogen sorption is slowed down
Solution Approach 1:
The system is divided into distinct functional layers: a polymeric protective layer that shields the getter from electrolyte contact, and a metal getter support layer that provides high-capacity hydrogen sorption. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
Different regions of the getter system have different properties: the polymeric layer provides chemical stability and protection, while the metal getter regions provide high-capacity hydrogen sorption. This local differentiation of material properties resolves the contradiction between protection and sorption efficiency.
2Reliability
If getter material is enclosed in a polymeric container, then protection from electrolyte is achieved, but the structure becomes fragile especially at junction areas
Solution Approach 1:
The invention extracts the protective function from a separate polymeric container and integrates it as a coating layer directly on the getter support. This eliminates the fragile junction areas of enclosed containers while maintaining the protective barrier against electrolyte.
Solution Approach 2:
The system uses a composite structure combining polymeric protective layer with metal getter support, where each material contributes its strengths: the polymer provides chemical resistance and the metal provides structural integrity and sorption capacity.
3Productivity
If multi-layer metal getter is used for hydrogen removal, then high hydrogen sorption capacity is achieved, but under abnormal conditions the materials become gas sources leading to device breakage
Solution Approach 1:
The polymeric protective layer is applied in advance to prevent direct contact between the metal getter and the electrolyte. This preliminary protection prevents the chemical reactions that would cause gas generation under abnormal conditions, while allowing normal hydrogen sorption function.
Solution Approach 2:
The polymeric layer acts as an intermediary barrier between the metal getter and the electrolyte environment. It mediates the interaction by allowing hydrogen diffusion while preventing harmful chemical reactions that would generate gas under abnormal operating conditions.
4Reliability
If polymeric layer is used to shield getter from electrolyte, then protection is provided, but hydrogen sorption is slowed down
Solution Approach 1:
A thin polymeric film is used as the protective layer, optimized to provide sufficient barrier protection against electrolyte while maintaining adequate hydrogen permeability. The thin film configuration minimizes diffusion path length for hydrogen while still providing effective protection.
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 improves hydrogen removal efficiency, increases device capacity, and enhances safety by actively removing harmful species, reducing the risk of device breakage and maintaining operational stability under various conditions.
Implementation Method 1
the use of materials comprising an external layer made of a noble metal... very effective in the removal of hydrogen
Implementation Method 2
a protective polymeric layer permeable to the harmful species but impermeable to the electrolyte
Implementation Method 3
enhancing hydrogen removal and sorption of additional harmful species like H2O and CO2
Data Source
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AI summary
An improved multi-layer composite getter is disclosed, as well as a method for its manufacturing and electrochemical devices for energy storage that employ said multi - layer getter composites.