Acidified Metal Oxide Cathodes With Controlled Surface Acidity
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Solution Overview
Problem
Existing battery technologies face issues with acidic groups degrading system components and catalyzing unwanted side reactions, leading to electrolyte decomposition and cell failure, while superacidity is too strong for many applications, and existing construction techniques do not fully utilize the potential of synthetic metal oxides.
Innovation Solution
Development of nanoparticle-sized metal oxides with controlled surface acidity (pH < 7, H0 > −12) and conductive carbon, used in electrodes with low active material loading, combined with acidic electrolytes and electrodes, to enhance reactivity and ion uptake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acidic groups are introduced to enhance reactivity and electron mobility, then reaction rate and electron mobility are improved, but metal current collectors and housings are attacked and electrode components deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface acidity of metal oxides to fall within a specific range (pH 2-6, Hammett function H0 > -12) rather than using strong superacids. This parameter optimization enables the metal oxide surface to provide enhanced reactivity and electron mobility while avoiding excessive acidity that would cause component degradation and gas generation.
Solution Approach 2:
The patent applies local quality by creating acidic sites only on the surface of metal oxide particles through controlled synthesis methods, rather than making the entire electrode or battery components acidic. The acidic character is localized to the metal oxide surface (20-40 wt% of electrode), providing catalytic activity where needed while the bulk electrode structure and other components remain stable.
2Productivity
If superacidity is used to maximize catalytic activity, then electron mobility is maximized, but unwanted side reactions are catalyzed and electrolyte decomposition occurs
Solution Approach 1:
The patent applies parameter changes by defining and controlling the acidity parameters (pH 2-6, H0 > -12) of metal oxide surfaces to achieve optimal electron mobility while avoiding the harmful effects of superacidity. This precise parameter control prevents electrolyte decomposition and unwanted side reactions that would occur with stronger acids.
3Ease of manufacture
If conventional battery construction techniques are used, then manufacturing simplicity is maintained, but the potential of synthetic metal oxides is not fully utilized
Solution Approach 1:
The patent applies composite materials by combining metal oxide particles (20-40 wt%) with conductive carbon materials (20-40 wt%) and binders to form electrode compositions. This composite approach utilizes the catalytic and electronic properties of synthetic metal oxides while maintaining electrode integrity and manufacturability through established composite electrode fabrication techniques.
Solution Approach 2:
The patent applies parameter changes by optimizing the weight percentage of metal oxide in electrodes (20-40 wt%) to balance capacity enhancement with manufacturing feasibility. This parameter optimization allows full utilization of synthetic metal oxide potential while maintaining compatibility with conventional electrode fabrication processes.
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
Improves battery capacity by up to 100 mAh/g, extends cycle life by up to 100 cycles, and maintains battery integrity through reduced degradation and gas generation.
Implementation Method 1
the method of synthesis can have broad effects on the nature of the surface, including its acid/base characteristics. A change in the character of the surface can alter the properties of the oxide, affecting such things as its catalytic activity and electron mobility.
Implementation Method 2
acidity may still be useful in these same applications to provide enhanced reactivity and rate characteristics or improved electron mobility
Implementation Method 3
combined with acidic electrolytes and electrodes, to enhance reactivity and ion uptake
Data Source
AI summary
Battery cells of this disclosure include a zinc anode and a cathode having acidified metal oxide nanomaterials combined with alkaline battery chemistry materials.