Metal-Air Battery Anode with Gas Impermeable Integument
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Solution Overview
Problem
Metal-air batteries face issues such as anode corrosion when exposed to oxygen, leading to reduced anode life and increased manufacturing costs due to complex handling and sealing requirements, especially in mass production of flat plate batteries.
Innovation Solution
A spiral wound electrode assembly with a substantially oxygen impermeable anode, featuring a conductive matrix with metal particles and a gas impermeable, ionically conductive integument to reduce exposure to oxygen and constrain movement of metal particles and byproducts, along with a catalytic cathode and gas diffusion layer to facilitate electrochemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the anode is made porous to increase surface area for electrochemical reactions, then the electrochemical performance is improved, but the anode becomes more exposed to oxygen causing increased corrosion
Solution Approach 1:
The anode is segmented into metal particles distributed throughout a conductive matrix, creating a porous structure that maintains high surface area while allowing the gas impermeable integument to protect individual particles from oxygen exposure
Solution Approach 2:
The anode uses a composite structure combining metal particles with a conductive matrix material, where the matrix provides structural support and electrical conductivity while the gas impermeable integument provides protective functionality
2Reliability
If complex sealing requirements are implemented to prevent oxygen exposure, then anode corrosion is reduced, but manufacturing complexity and costs increase
Solution Approach 1:
Instead of requiring complex sealing of the entire anode structure, the gas impermeable integument provides localized protection at the particle level, allowing simpler overall manufacturing processes while maintaining corrosion resistance
Solution Approach 2:
The gas impermeable integument is integrated directly into the anode structure itself, making the anode self-protecting against oxygen exposure without requiring external sealing systems or complex manufacturing procedures
3Productivity
If flat plate battery configuration is used for mass production, then manufacturing efficiency is improved, but surface-to-volume ratio is reduced limiting performance
Solution Approach 1:
The invention transitions from traditional flat plate geometry to a three-dimensional spiral wound configuration, increasing the surface-to-volume ratio and active material utilization while maintaining compatibility with mass production techniques
4Quantity of substance
If metal particles are loosely packed to increase porosity, then ion transport is improved, but relative movement of particles and byproducts increases reducing structural stability
Solution Approach 1:
The gas impermeable integument is formed around metal particles before assembly into the final structure, pre-constraining potential particle movement and byproduct displacement while maintaining the porosity needed for ion transport
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 enhances anode life by minimizing oxygen exposure and reduces manufacturing costs through improved surface-to-volume ratios, while maintaining high current density and efficient electrochemical performance.
Implementation Method 1
a gas impermeable and selectively ionically conductive integument surrounding at least a portion of each of the metal particles such that exposure of the metal particles to oxygen is reduced
Implementation Method 2
selectively ionically conductive integument
Implementation Method 3
a dielectric separator disposed between the anode and cathode
Implementation Method 4
a gas diffusion layer adjacent to the cathode
Implementation Method 5
a catalytic cathode
Implementation Method 6
oxygen reacts at a cathode to form hydroxyl ions
Implementation Method 7
hydroxyl ions that migrate into the metal/electrolyte paste
Data Source
AI summary
A metal-air battery includes a canister and a spiral wound electrode assembly disposed within the canister. The electrode assembly includes an ion permeable and substantially gas impermeable anode, a catalytic cathode, and a dielectric separator disposed between the anode and cathode.