Magnetic Separation of Li-Ion Electrode Materials for Direct Reuse
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Solution Overview
Problem
Current recycling methods for electrochemical cell materials, such as pyrometallurgical and hydrometallurgical processes, fail to recover electrode active materials in their original structural and chemical forms, making it difficult to directly reuse them in new electrochemical cell manufacturing, and pose environmental and health concerns.
Innovation Solution
A magnetic separation process that magnetizes paramagnetic electrode active materials, such as lithium metal compounds, using a magnetic field to separate them from other components, allowing for the collection of high-purity recycled material concentrates that can be directly reused in new electrochemical cell production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If pyrometallurgical or hydrometallurgical processes are used to recycle electrochemical cell materials, then materials can be recovered, but the electrode active materials are not recovered in their original structural and chemical forms, requiring costly and environmentally hazardous post-processing steps
Solution Approach 1:
The patent extracts electrode active materials from electrochemical cells using magnetic separation technology. The magnetic separator selectively attracts and removes paramagnetic electrode active materials (such as lithium metal compounds) from the comminuted cell material, obtaining a concentrated stream of recovered materials in their original structural and chemical forms without requiring additional processing steps
Solution Approach 2:
The patent replaces traditional pyrometallurgical or hydrometallurgical processes with a magnetic separation system. Instead of using high-temperature heating or chemical dissolution, the invention uses a magnetic field to selectively separate electrode active materials based on their magnetic properties, achieving recovery in original forms without the need for costly and environmentally hazardous post-processing
2Loss of substance
If pyrometallurgical or hydrometallurgical processes are used to recycle electrochemical cell materials, then materials can be recovered, but environmental and health concerns are raised due to hazardous post-processing steps
Solution Approach 1:
The patent exploits the paramagnetic properties of electrode active materials (such as lithium metal compounds) to separate them from non-magnetic materials. By using the inherent magnetic characteristics of the target materials, the process achieves selective recovery without requiring hazardous chemicals or high-temperature processing, thereby eliminating environmental and health concerns associated with traditional methods
Solution Approach 2:
The patent replaces environmentally hazardous pyrometallurgical or hydrometallurgical processes with a magnetic separation system that uses only a magnetic field. This substitution eliminates the need for costly and environmentally hazardous post-processing steps while achieving the same material recovery goal
3Manufacturing precision
If magnetic separation is used to separate electrode active materials, then high-purity concentrates can be obtained, but the process requires a magnetic field generation system
Solution Approach 1:
The patent uses the inherent paramagnetic properties of electrode active materials to enable their self-separation from non-magnetic materials. The magnetic separator simply needs to provide a magnetic field, and the paramagnetic materials automatically respond by being attracted and separated, requiring minimal additional processing or complex equipment
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 magnetic separation process efficiently recovers electrode active materials in their original forms, eliminating the need for costly and environmentally hazardous post-processing steps, and enables the direct reuse of these materials in new electrochemical cell manufacturing, reducing waste and environmental impact.
Implementation Method 1
The slurry is subjected to a magnetic field of sufficient magnetic field intensity to magnetize particles in the slurry. The magnetized particles comprise at least one lithium metal compound.
Implementation Method 2
The magnetized particles are separated from the slurry using magnetic force induced between the magnetized particles and an active magnetic surface in contact with the slurry.
Data Source
AI summary
A process. The process includes forming a slurry comprising electrode active material particles of one or more lithium-ion electrochemical cells, magnetizing the electrode active material particles, and separating the magnetized electrode active material particles from the slurry.