Acidified Metal Oxide Battery Electrodes Without Superacid Degradation
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Solution Overview
Problem
Conventional battery technologies face challenges with acidic species in electrodes and electrolytes, as they can degrade components and lead to electrolyte decomposition, resulting in reduced battery performance and lifespan.
Innovation Solution
The development of acidified metal oxide (AMO) nanomaterials with controlled surface acidity, used in battery electrodes and electrolytes, which are not superacidic, enhancing electron mobility and reactivity while preventing component deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acidic species are used in battery electrodes and electrolytes to enhance reactivity and electron mobility, then battery capacity and electron mobility are improved, but component degradation and electrolyte decomposition occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the acidity level of metal oxide surfaces through surface treatment methods. The surface acidity is adjusted to fall within a specific range (Hammett acidity function H0 between -10 and 0) that provides enhanced reactivity and electron mobility while avoiding the detrimental effects of superacidity. This parameter optimization resolves the contradiction by finding the optimal acidity level that improves battery capacity without causing component degradation
Solution Approach 2:
The patent uses composite materials by combining metal oxide particles with controlled surface acidity characteristics with battery electrodes and electrolytes. The acidified metal oxide surface creates a composite structure that enhances electron mobility and reactivity at the interface while the bulk material maintains stability. This composite approach allows the system to benefit from acidic properties for improved capacity while avoiding the instability associated with fully acidic environments
2Productivity
If superacidic surfaces are created to maximize catalytic activity, then reaction rate is improved, but system component degradation and unwanted side reactions occur
Solution Approach 1:
The patent applies parameter changes by controlling the surface acidity parameter (Hammett acidity function H0) to fall within the range of -10 to 0, which is less acidic than superacids (H0 < -12). This parameter optimization provides sufficient catalytic activity and reaction rate enhancement while avoiding the harmful effects of superacidity such as component degradation and unwanted side reactions. The surface treatment methods enable precise control of this acidity parameter
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 use of AMO materials improves battery capacity, cyclability, and longevity by up to 100 mAh/g and extends cycle life by 100 charge-discharge cycles, without causing component degradation or gas generation.
Implementation Method 1
the surface hydroxyl groups are thought to promote electron transfer from the conduction band to chemisorbed oxygen molecules
Implementation Method 2
The AMOs described herein are useful in a variety of applications including, but not limited to, battery electrode materials, catalysts, photovoltaic or photoactive components, and sensors
Data Source
AI summary
Described herein is a battery cell having an anode or cathode comprising an acidified metal oxide (“AMO”) material, preferably in monodisperse nanoparticulate form 20 nm or less in size, having a pH<7 when suspended in a 5 wt % aqueous solution and a Hammett function H0>−12, at least on its surface.