Recycled Lithium-Ion Cathode Material via Low-Temperature Precipitation
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Solution Overview
Problem
Conventional recycling methods for lithium-ion batteries require high-temperature processes to separate cobalt, manganese, nickel, and lithium, which are energy-intensive and costly, and cannot effectively recover these metals for use in new cathode materials without expensive organic reagents.
Innovation Solution
A low-temperature solution is developed that maintains cobalt, manganese, and nickel in a commingled state, using sodium hydroxide to precipitate them in a predetermined ratio, allowing for the synthesis of recycled cathode materials without breaking down or recombining the compounds, and incorporating additional pure materials to achieve the desired composition for new lithium-ion batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional high-temperature separation processes are used to extract cobalt, manganese, nickel, and lithium, then the metals can be recovered, but energy consumption and costs increase significantly
Solution Approach 1:
The patent changes the temperature parameter from high-temperature thermal decomposition to low-temperature aqueous chemistry. By using water-based extraction at ambient or mildly elevated temperatures, the process achieves metal recovery without the energy-intensive heating required by conventional pyrometallurgical methods.
Solution Approach 2:
The patent replaces thermal/mechanical separation systems with chemical extraction systems. Instead of using high-temperature incineration and physical separation, the invention employs aqueous leaching, pH-controlled precipitation, and solvent extraction to separate and recover metals, substituting thermal energy with chemical reactions.
2Ease of manufacture
If high-temperature processes are used to separate and recombine metal compounds, then cathode materials can be produced, but the process becomes costly and energy-intensive
Solution Approach 1:
The patent changes the manufacturing parameters from high-temperature solid-state reactions to low-temperature aqueous chemistry. By controlling pH, oxidation state, and ligand concentration in solution, the process precipitates metal hydroxides and carbonates that can be directly calcined at lower temperatures to form cathode materials, reducing both energy cost and process complexity.
Solution Approach 2:
The patent introduces aqueous solutions, pH buffers, and chelating agents as intermediaries to facilitate metal separation and recombination. These chemical mediators enable controlled precipitation and dissolution of metal compounds at low temperatures, replacing the need for expensive high-temperature processing equipment and reducing operational costs.
3Quantity of substance
If conventional methods are used to recycle lithium-ion batteries, then some metals can be recovered, but the process cannot effectively recover all metals for use in new cathode materials
Solution Approach 1:
The patent segments the recycling process into distinct chemical stages: (1) aqueous leaching to dissolve all metals into solution, (2) pH-controlled selective precipitation to separate different metal hydroxides based on their solubility products, (3) chelating agent extraction to further purify individual metals. This segmented approach enables complete recovery of cobalt, manganese, nickel, and lithium with high purity suitable for various cathode compositions.
Solution Approach 2:
The patent creates a universal recycling process that can handle mixed cathode materials containing different combinations of cobalt, manganese, nickel, and lithium. The aqueous chemistry approach works regardless of the original cathode composition, and the recovered metals can be recombined into any desired cathode material formulation, providing flexibility for producing different battery chemistries.
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
This approach reduces energy consumption and costs, achieves high recovery efficiency, and provides a practical and economically viable method for recycling lithium-ion batteries, addressing the environmental and resource challenges posed by the increasing demand for lithium.
Implementation Method 1
A strong base, such as sodium hydroxide, raises the pH such that the desired materials precipitate out of solution
Implementation Method 2
A strong base, such as sodium hydroxide, raises the pH such that the desired materials precipitate out of solution without extensive heating or separation of the desired materials into individual compounds or elements
Data Source
AI summary
Cathode material from exhausted lithium ion batteries are dissolved in a solution for extracting the useful elements Co (cobalt), Ni (nickel), Al (Aluminum) and Mn (manganese) to produce active cathode materials for new batteries. The solution includes compounds of desirable materials such as cobalt, nickel, aluminum and manganese dissolved as compounds from the exhausted cathode material of spent cells. Depending on a desired proportion, or ratio, of the desired materials, raw materials are added to the solution to achieve the desired ratio of the commingled compounds for the recycled cathode material for new cells. The desired materials precipitate out of solution without extensive heating or separation of the desired materials into individual compounds or elements. The resulting active cathode material has the predetermined ratio for use in new cells, and avoids high heat typically required to separate the useful elements because the desired materials remain commingled in solution.