Positive Electrode Active Material Recovery via Oxidation
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Solution Overview
Problem
Existing methods for recovering positive electrode active material from batteries result in contamination with carbon components and binding materials, making it difficult to achieve high-quality recycling, and are often costly and environmentally unfriendly due to the use of large amounts of organic solvents and high-pressure environments.
Innovation Solution
A recovery method involving the oxidation of the positive electrode mixture using ozone and hydrogen peroxide in a controlled pH environment, which allows for the separation and recovery of high-quality positive electrode active material without the need for special solvents or high-pressure equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional recovery methods using solvents or acid solutions are used, then positive electrode active material can be separated from the battery, but the recovered material is contaminated with carbon components and binding materials, reducing its quality and crystallinity
Solution Approach 1:
The patent applies strong oxidants (ozone and/or hydrogen peroxide) to oxidize and remove carbon components and binding materials from the recovered positive electrode active material. This oxidation treatment eliminates contaminants that conventional methods fail to remove, thereby improving both the quality and crystallinity of the recovered material without requiring harsh solvents or acid solutions
2Manufacturing precision
If large amounts of organic solvents or high-pressure environments are used to remove binding materials, then the binding material can be effectively removed, but the process becomes costly and environmentally unfriendly with high CO2 emissions
Solution Approach 1:
The patent replaces costly and environmentally harmful organic solvents and high-pressure processes with oxidation using ozone and/or hydrogen peroxide. These oxidants effectively remove binding materials and carbon components under milder conditions, significantly reducing operational costs and environmental impact while maintaining high purity of the recovered material
Solution Approach 2:
The patent changes the chemical environment parameters by controlling pH (maintaining basic conditions with pH ≥ 9) and using specific oxidizing agents. This parameter optimization allows effective contaminant removal without requiring extreme conditions, making the process more economical and environmentally friendly
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 method enables the recovery of positive electrode active material with preserved crystallinity and reduced environmental impact, achieving high productivity and cost-effectiveness by directly oxidizing and removing contaminants in a wet environment, thus minimizing CO2 emissions.
Implementation Method 1
supplying at least one of ozone and hydrogen peroxide to a slurry containing the positive electrode mixture to oxidize the positive electrode mixture
Data Source
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AI summary
A recovery method for a positive electrode active material includes: separating and recovering, from a positive electrode plate of a battery in which a positive electrode mixture containing a positive electrode active material is laminated on a positive electrode foil, the positive electrode mixture; supplying at least one of ozone and hydrogen peroxide to a slurry containing the positive electrode mixture to oxidize the positive electrode mixture; and separating and recovering the positive electrode active material from the slurry.