Lithium-Ion Cathode Recycling via Low-Temperature Co-Precipitation
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Solution Overview
Problem
Conventional recycling methods for lithium-ion batteries are energy-intensive, costly, and inefficient, particularly in separating and recombining cobalt, manganese, nickel, and lithium without breaking down compounds, which limits their ability to produce new active cathode materials effectively.
Innovation Solution
A low-temperature solution is developed where cobalt, nickel, and manganese are dissolved from spent lithium-ion battery cathodes and remain commingled, allowing for a change in concentration by adding small amounts of pure charge materials to achieve a target composition for new cathode materials, avoiding high heat and extensive separation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional high-heat separation processes are used to separate cobalt, nickel, and manganese from spent battery cathodes, then the useful elements can be extracted, but extensive heating and separation into individual compounds is required which increases energy consumption and process complexity
Solution Approach 1:
The patent changes the temperature parameter from high-heat conventional processes to low-temperature solution-based extraction. By using aqueous solutions at low temperatures to dissolve and extract cobalt, nickel, and manganese from spent cathodes, the method achieves element recovery without the extensive heating required by conventional methods, directly resolving the energy consumption contradiction
Solution Approach 2:
The patent introduces aqueous solutions as an intermediary medium to facilitate the extraction and recombination of useful elements. These solutions act as mediators that dissolve cathode materials and enable the reprecipitation of cobalt, nickel, and manganese compounds in desired ratios, eliminating the need for direct high-heat separation and reducing energy requirements
2Manufacturing precision
If conventional methods separate useful elements into individual compounds, then pure materials are obtained, but the process becomes complex and requires extensive heating and separation steps
Solution Approach 1:
The patent merges the extraction and recombination steps into a single integrated process. By dissolving spent cathode materials in aqueous solutions and directly reprecipitating cobalt, nickel, and manganese compounds in the desired ratios within the same solution system, the method achieves material purification without the complex multi-step separation processes of conventional methods
Solution Approach 2:
The patent changes the chemical parameters of the extraction medium to enable direct recombination. By using aqueous solutions with specific pH and composition that allow simultaneous dissolution and controlled reprecipitation of multiple metal compounds, the process achieves purification while simplifying the overall procedure and reducing process complexity
3Loss of substance
If spent battery materials are processed through conventional recycling, then waste volume is reduced, but high energy input and costly processing are required
Solution Approach 1:
The patent replaces mechanical and thermal separation systems with a chemical solution-based system. By using aqueous extraction and reprecipitation chemistry instead of high-heat thermal processing and mechanical separation, the method achieves waste material processing at lower cost and energy input, directly addressing the manufacturing cost contradiction
Solution Approach 2:
The patent enables the spent battery materials to essentially process themselves through the solution-based extraction. The aqueous solutions naturally dissolve the cathode materials and the metal compounds reprecipitate in desired ratios through controlled chemical conditions, reducing the need for expensive external processing infrastructure and operations
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 enables the efficient recycling of lithium-ion batteries, reducing waste volume, conserving energy, and providing a cost-effective source of active cathode materials for new batteries, while maintaining the environmental benefits of reduced mining and processing costs.
Implementation Method 1
cobalt, nickel, and manganese are dissolved from spent lithium-ion battery cathodes and remain commingled
Implementation Method 2
A strong base, such as sodium hydroxide, raises the pH such that the desired materials precipitate out of solution
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.