Removable Air Electrode Cathode Compartment for Rechargeable Metal-Air Batteries
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Solution Overview
Problem
Metal-air batteries face instability and reduced lifespan during the charging phase due to the fragile porous structure of the air electrode, which is not designed for reverse oxidation, leading to mechanical damage and catalyst instability, limiting their commercial development as electrically rechargeable accumulators.
Innovation Solution
A cathode compartment is designed to house the air electrode in a plate form, allowing for easy extraction and replacement, with a liquid-tight structure, mechanical reinforcement, and compression features to manage the metal electrode, enabling continued use of the battery even when the air electrode reaches the end of its life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the air electrode uses a porous structure to provide large reaction surface area for oxygen reduction, then the current density and energy efficiency are improved, but the mechanical strength is reduced and the electrode becomes fragile during charging
Solution Approach 1:
The air electrode is segmented into multiple layers with different functions: a porous layer for high surface area reactions and a reinforced layer for mechanical strength. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The air electrode uses composite materials combining porous carbon materials for electrochemical activity with reinforcing materials for mechanical strength. This composite structure maintains high current density while preventing electrode fragmentation during charging cycles.
2Productivity
If the air electrode is designed for optimal oxygen reduction reaction, then the discharge performance is improved, but the stability during charging phase deteriorates due to mechanical destruction by oxygen gas release
Solution Approach 1:
The electrode structure incorporates beforehand cushioning elements and reinforced frameworks that prevent mechanical destruction before it occurs. These preventive structures absorb the stress of oxygen gas release during charging, preventing electrode fragmentation and maintaining reliability throughout the battery lifecycle.
3Use of energy by moving object
If the catalyst is added to improve oxygen reduction reaction efficiency, then the energy efficiency is improved, but the catalyst stability at high potentials deteriorates leading to carbon corrosion
Solution Approach 1:
The catalyst system uses parameter changes by selecting catalyst materials and configurations that maintain high activity at lower potentials while being stable at the higher potentials required for oxygen evolution during charging. This optimizes the energy efficiency during discharge while ensuring catalyst stability during charging cycles.
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
This solution extends the lifespan of the air electrode, allowing it to be replaced independently, thus prolonging the overall battery life and enabling continued use of the metal electrode, addressing the limitations of existing metal-air batteries.
Implementation Method 1
O 2 + 2·H 2 O + 4·e - positive electrode (air electrode)
Implementation Method 2
An air electrode is a porous solid structure in contact with the liquid electrolyte, which is usually an alkaline solution
Implementation Method 3
4·OH - positive electrode (air electrode)
Data Source
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Figure 8~9
AI summary
The present invention relates to a rechargeable battery (1) including a casing (11) containing therein: an air electrode (22); a negative electrode (3); and an electrolyte (4), in which the air electrode (22) can be taken out of the casing. The rechargeable battery also relates to a cathode compartment (2) for an air electrode battery. Said compartment includes an air electrode and is insertable into a casing of the battery without being part of the casing. Said compartment is removably movable.