LFP Electrode Regeneration Using Plasma Ashing and Lithium Replenishment
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Solution Overview
Problem
Existing methods for recycling lithium iron phosphate electrode materials face challenges such as high energy consumption, oxidation of the internal crystal lattice during aerobic roasting, and blockage of lithium ion migration channels due to carbon residue from anaerobic pyrolysis, leading to inefficient lithium supplementation and regeneration.
Innovation Solution
A method involving shredding, ultrasonic dissociation, low-temperature plasma ashing, and lithium supplementation followed by solidification roasting to separate, purify, and regenerate lithium iron phosphate electrode materials, ensuring the stability of the internal crystal structure while reducing energy consumption and enhancing impurity removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature aerobic roasting is used to purify electrode materials, then carbon impurities are removed, but energy consumption increases and internal crystal lattice is oxidized
Solution Approach 1:
The patent changes the temperature parameter from high-temperature aerobic roasting to low-temperature anaerobic pyrolysis (below 500°C), fundamentally altering the thermal processing conditions to achieve carbon removal while preserving crystal structure and reducing energy consumption
Solution Approach 2:
The patent uses an inert or reducing atmosphere during pyrolysis instead of aerobic roasting, preventing oxidation of the lithium iron phosphate crystal lattice while effectively removing carbon impurities through thermal decomposition
2Use of energy by moving object
If anaerobic pyrolysis is used to remove organic matter, then energy consumption is reduced, but carbon residue blocks lithium ion migration pathways
Solution Approach 1:
The patent applies controlled pyrolysis conditions with precise temperature and time parameters to achieve partial decomposition of organic matter while minimizing carbon residue formation, balancing energy savings with maintaining lithium ion transport pathways
Solution Approach 2:
The patent optimizes pyrolysis parameters including temperature (below 500°C), time, and atmosphere composition to control the degree of organic matter decomposition, ensuring sufficient carbon removal while preventing excessive carbon residue that would block ion migration
3Manufacturing precision
If oxidation is applied to remove carbon impurities, then purity increases, but internal crystal structure changes
Solution Approach 1:
The patent employs inert or reducing atmosphere during the thermal processing stage, creating an oxygen-depleted environment that prevents oxidation of the lithium iron phosphate crystal lattice while still enabling effective carbon impurity removal through thermal decomposition mechanisms
4Manufacturing precision
If deep purification is performed to remove all carbon impurities, then electrode material purity increases, but processing time and energy consumption increase
Solution Approach 1:
The patent optimizes pyrolysis parameters including temperature profile, treatment time, and atmosphere flow rate to achieve efficient carbon impurity removal within a reasonable time frame, balancing purification effectiveness with processing efficiency
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 achieves efficient separation and purification of lithium iron phosphate electrode materials with reduced energy consumption, effective impurity removal, and improved electrochemical properties by maintaining the crystal structure integrity and facilitating lithium supplementation.
Implementation Method 1
performing an ultrasonication to detach the anode material from a copper foil, achieving efficient dissociation between the anode material and the copper foil as well as between graphite electrode material particles
Implementation Method 2
The spent lithium iron phosphate cathode material is performed a plasma ashing treatment in an oxygen atmosphere at 140° C. to 150° C., the organic binder, fluorine and carbon impurities in the cathode material are removed
Implementation Method 3
Lithium supplementation is performed on the lithium iron phosphate electrode material with deep impurity removal and purification in a reducing atmosphere to replenish lithium ions missing from the internal crystal structure
Implementation Method 4
the lithium-supplemented electrode material is roasted in an inert atmosphere at 550° C. to 800° C. to achieve a material solidification and a crystal structure repair
Data Source
AI summary
A method for separation, purification and regeneration of spent lithium iron phosphate electrode materials is disclosed, the present disclosure removes the anode material graphite by selective water dissolution and separation of the anode binder, and achieves the leaching of lithium ions in the graphite anode material and serves as a lithium supplement agent; the surface modification and activation of spent lithium iron phosphate cathode materials are performed by high purity oxygen low-temperature plasma ashing technology, while removing organic matter to achieve the dissociation of lithium iron phosphate particles, the surface carbon content of spent lithium iron phosphate electrode materials is effectively controlled to achieve the objective of deep purification and carbon removal, moreover, the internal crystal structure of the electrode material is activated, the migration channel of lithium ion is activated, and the subsequent lithium supplement efficiency is greatly improved.