3D Air Electrode Structure for Rare-Metal-Free Metal-Air Batteries
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Solution Overview
Problem
Metal-air batteries without rare metals face performance degradation, and existing solutions may use environmentally hazardous materials like lead or indium, leading to soil contamination concerns.
Innovation Solution
A metal-air battery design featuring an air electrode with a co-continuous body having a three-dimensional network structure and mesoporous carbon, manufactured through steps involving sol or gel dispersion, freezing, drying, and carbonization, which eliminates the need for hazardous materials and enhances battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If environmentally hazardous materials like lead or indium are used in the air electrode, then battery performance is improved, but environmental safety deteriorates due to soil contamination risks
Solution Approach 1:
The patent changes the physical and chemical parameters of the air electrode by creating a co-continuous body with a specific three-dimensional network structure and controlling the pore size distribution (mesoporous structure with 2-50 nm pores). This structural parameter change enables environmentally safe materials to achieve performance comparable to hazardous materials by optimizing the physical architecture rather than relying on toxic catalysts
Solution Approach 2:
The patent employs composite materials by combining the co-continuous body (made from environmentally safe polymers or carbon materials) with mesoporous carbon structures. This composite approach creates a synergistic effect where the structured composite achieves high performance without requiring lead, indium, or other hazardous substances, thus resolving the contradiction between performance and environmental safety
2Object-affected harmful factors
If rare metals are avoided in the air electrode, then environmental safety is improved, but battery performance deteriorates
Solution Approach 1:
The patent utilizes porous materials by incorporating mesoporous carbon with controlled pore sizes (2-50 nm) into the air electrode structure. The porous structure provides high surface area and efficient mass transport pathways, enabling environmentally safe materials to achieve high battery performance through optimized physical structure rather than relying on rare metal catalysts
Solution Approach 2:
The patent changes the structural parameters of the air electrode by creating a co-continuous body with specific network architecture and controlling the pore size distribution. This parameter optimization enables the use of environmentally safe materials while maintaining high battery performance through enhanced mass transport and electrochemical activity
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 the performance of metal-air batteries by increasing specific surface area and oxygen adsorption capacity, leading to higher discharge voltage and capacity while minimizing environmental impact by avoiding harmful substances.
Implementation Method 1
a producing step of producing a sol or gel in which the mesoporous carbon and a plurality of nanostructures are dispersed
Implementation Method 2
a freezing step of freezing the sol or gel, to obtain a frozen material
Implementation Method 3
a drying step of drying the frozen material in vacuum, to obtain a co-continuous body having a three-dimensional network structure
Implementation Method 4
a carbonizing step of heating the co-continuous body in an inert gas atmosphere, to carbonize the precursor supported on the co-continuous body
Implementation Method 5
a synthesizing step of performing etching on the carbonized precursor, to remove the mesoporous silica of the precursor, and synthesizing the mesoporous carbon
Implementation Method 6
a co-continuous body having a three-dimensional network structure in which a plurality of nanostructures is split and integrated
Implementation Method 7
mesoporous carbon supported on the co-continuous body
Data Source
AI summary
A metal-air battery includes: an air electrode; a negative electrode containing a metal; and an electrolyte having ion conductivity. The air electrode includes: a co-continuous body having a three-dimensional network structure in which a plurality of nanostructures is split and integrated; and mesoporous carbon supported on the co-continuous body.