Blended Battery Active Materials With Controlled Surface Acidity
Find Innovative SolutionsGenerate Solutions
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.
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, allowing for enhanced reactivity and electron mobility without superacidity, and incorporating acidic electrolytes or electrodes to improve capacity and cyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If acidic groups are introduced to enhance reactivity and electron mobility, then reactivity and electron mobility are improved, but system components degrade and electrolyte decomposition occurs
Solution Approach 1:
The patent applies parameter changes by precisely controlling the acidity level of metal oxide surfaces. Instead of using strong acids that cause degradation, the patent creates metal oxide surfaces with specific pH ranges (6-8) and Hammett numbers (H0 > -12), transforming the harmful strong acidity into beneficial mild acidity that enhances electron mobility while maintaining system stability.
Solution Approach 2:
The patent applies local quality by creating non-uniform surface properties on metal oxide particles. Through controlled synthesis methods, the patent generates surfaces with localized acidic sites distributed across the particle surface, providing enhanced reactivity and electron mobility at specific locations while the overall particle maintains structural integrity and compatibility with surrounding components.
2Productivity
If superacidity is used to maximize reactivity, then reactivity is enhanced, but unwanted side reactions are catalyzed and cell failure occurs
Solution Approach 1:
The patent transforms the parameter of acidity from extreme (superacidic) to moderate by controlling surface pH and Hammett number parameters. This parameter transformation allows the metal oxide surfaces to provide sufficient catalytic activity for desired reactions while avoiding the excessive reactivity that leads to unwanted side reactions and cell failure.
Solution Approach 2:
The patent creates metal oxide surfaces that copy or mimic the beneficial catalytic properties of superacids without actually achieving superacidic conditions. By synthesizing metal oxide particles with controlled surface characteristics (specific pH and H0 ranges), the patent replicates the high reactivity needed for improved performance while eliminating the harmful effects of true superacidity.
3Power
If metal oxide surface acidity is increased to improve electron mobility, then electron mobility is enhanced, but metal current collectors and housings are attacked
Solution Approach 1:
The patent resolves this contradiction by changing the acidity parameter from strong to mild. By controlling metal oxide surface pH to 6-8 and Hammett numbers to H0 > -12, the patent achieves sufficient electron mobility for high performance while the mild acidity becomes non-corrosive to metal current collectors and housing materials.
Solution Approach 2:
The patent uses metal oxide particles as intermediary materials between the electrolyte and metal components. These particles provide the desired acidic surface properties for enhanced electron mobility while their controlled mild acidity acts as a protective buffer, preventing direct contact and harmful interactions between strong acids and metal current collectors.
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
Achieves higher capacity (up to 1000 mAh/g) and extended cycle life (up to 100 cycles) in batteries by utilizing nanoparticle-sized metal oxides with controlled surface acidity and acidic electrolytes or electrodes, preventing degradation and improving performance.
Implementation Method 1
nanoparticle-sized metal oxides with controlled surface acidity (pH < 7, H0 > −12)
Implementation Method 2
enhanced reactivity and electron mobility
Implementation Method 3
incorporating acidic electrolytes or electrodes to improve capacity and cyclability
Data Source
AI summary
Acidified metal oxides combined with non-acidified metal oxides used as a battery electrode active material.