Air Electrode Mixture for Air Secondary Battery
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Solution Overview
Problem
Air secondary batteries face challenges with energy efficiency and high output due to large overvoltage in the discharge reaction, primarily in the oxygen reduction reaction at the air electrode, which hinders their practical application.
Innovation Solution
An air electrode mixture containing a pyrochlore-type composite oxide and a manganese oxide is used, where the pyrochlore-type composite oxide has a dual function as a catalyst for oxygen generation and reduction, and the manganese oxide decomposes hydrogen peroxide intermediates, reducing overvoltage and enhancing discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional air secondary batteries use standard air electrode materials, then the battery structure is simple, but large overvoltage occurs in the oxygen reduction reaction, resulting in low energy efficiency and insufficient output
Solution Approach 1:
The patent uses a composite air electrode mixture containing pyrochlore-type composite oxide (A2-xB2-yO7-z) and manganese oxide. The pyrochlore-type oxide serves as the primary catalyst for oxygen reduction reaction, while manganese oxide decomposes hydrogen peroxide intermediates. This composite material approach reduces discharge overvoltage and improves energy efficiency without significantly complicating the device structure.
Solution Approach 2:
The patent optimizes the compositional parameters of the pyrochlore-type composite oxide by controlling the substitution amounts of elements A and B, represented by parameters x, y, and z in the formula A2-xB2-yO7-z. By adjusting these parameters within specific ranges, the catalyst activity is optimized to reduce overvoltage while maintaining structural stability.
2Productivity
If air secondary batteries are designed for high output, then energy efficiency improves, but the discharge overvoltage increases, preventing sufficient performance achievement
Solution Approach 1:
Manganese oxide acts as an intermediary substance that decomposes hydrogen peroxide intermediates formed during the oxygen reduction reaction. By removing these intermediates, the reaction pathway is optimized, reducing energy loss as overvoltage and enabling higher output performance. The manganese oxide facilitates the conversion of intermediates into useful products.
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 air electrode mixture significantly reduces discharge overvoltage, improving energy efficiency and achieving higher output in air secondary batteries, making them more suitable for practical use.
Implementation Method 1
the pyrochlore-type composite oxide has a dual function as a catalyst for oxygen generation and reduction
Implementation Method 2
the manganese oxide decomposes hydrogen peroxide intermediates
Implementation Method 3
Discharge(oxygen reduction reaction)：O2+2H2O+4e−→4OH−
Data Source
AI summary
A battery includes an electrode group including an air electrode and a negative electrode stacked with a separator therebetween, and a battery case accommodating the electrode group along with an alkali electrolyte solution, wherein the air electrode includes an air electrode mixture containing a pyrochlore-type composite oxide and a manganese oxide, and the pyrochlore-type composite oxide is a bismuth-ruthenium oxide.