Acidified Metal Oxide Electrodes for High-Capacity Lithium Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery technologies face limitations in achieving high capacity and longevity due to the detrimental effects of acidic species and active catalytic electrode surfaces, which can lead to electrolyte decomposition and cell failure.
Innovation Solution
The development of acidified metal oxide (AMO) nanomaterials with controlled surface acidity, used in conjunction with conductive materials and acidic species, to enhance the performance of battery electrodes by allowing higher lithium ion uptake and improved cyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional metal oxide electrodes are used with high active material loading (>80% by weight), then capacity is increased, but surface acidity leads to electrolyte decomposition and cell failure
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface acidity of metal oxide nanomaterials to a specific range (Hammett acidity function H0 between -10 and -13, preferably -11 to -12). This optimization of the acidity parameter enables high capacity while preventing electrolyte decomposition, resolving the contradiction between capacity and stability
Solution Approach 2:
The patent uses composite materials by combining metal oxide nanomaterials with conductive materials (such as carbon) to form electrodes. This composite structure maintains high active material loading while the controlled surface acidity of the metal oxide component prevents harmful reactions, achieving both high capacity and reliability
2Use of energy by moving object
If active catalytic electrode surfaces are created to enhance reactivity, then electron mobility is improved, but electrolyte decomposition occurs leading to gas generation and cell failure
Solution Approach 1:
The patent changes the surface acidity parameter of metal oxide nanomaterials to an optimal range that provides sufficient catalytic activity for good electron mobility while avoiding excessive reactivity that would cause electrolyte decomposition. This precise parameter control resolves the contradiction between electron mobility and electrolyte stability
3Productivity
If surface acidity is increased to enhance reactivity and electron mobility, then capacity is improved, but metal current collectors and housings are attacked causing deterioration
Solution Approach 1:
The patent optimizes the surface acidity parameter (H0 between -10 and -13) to achieve high reactivity and electron mobility while preventing attacks on metal current collectors and housings. This controlled acidity level maintains productivity without causing harmful effects on structural components
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 nanomaterials with controlled surface acidity in battery electrodes results in significantly increased capacity, improved cyclability, and extended cycle life, achieving capacities up to 15000 mAh/g and 1000 charge-discharge cycles without failure, while maintaining the structural integrity of battery components.
Implementation Method 1
acidified metal oxide (AMO) nanomaterials with controlled surface acidity
Implementation Method 2
allowing higher lithium ion uptake
Data Source
AI summary
Described herein are high capacity electrochemical cells including a first electrode comprising a metal oxide, such as acidified metal oxide (“AMO”) materials, and a second electrode comprising lithium metal, where the metal oxide is present in the first electrode at less than 80 weight percent. Methods of making electrodes comprising a metal oxide and methods of making electrochemical cells are also disclosed.