Lithium-Ion Cathode Recycling 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 are not economically or practically viable for widespread industrial application.
Innovation Solution
A low-temperature solution is developed where the desirable materials are extracted by precipitation, maintaining their commingled state to achieve a predetermined ratio for new cathode materials, avoiding the need for high-temperature separation and recombination, using a recycler apparatus that adjusts the solution's pH and adds small amounts of pure materials to achieve the target composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional high-temperature separation processes are used to extract cobalt, manganese, nickel, and lithium, then the useful elements can be separated and recovered, but the energy consumption and processing cost increase significantly
Solution Approach 1:
The patent changes the temperature parameter from high-temperature processing to low-temperature processing. Instead of using conventional high-temperature pyrometallurgical methods, the invention employs hydrometallurgical processes that operate at lower temperatures, thereby reducing energy consumption while still achieving effective extraction and recovery of valuable elements from spent battery materials
Solution Approach 2:
The patent replaces thermal/mechanical separation methods with chemical dissolution and precipitation methods. By using selective dissolution in acidic or alkaline solutions followed by controlled precipitation, the invention achieves element separation without the high energy input required by conventional thermal processing routes
2Loss of substance
If conventional high-temperature separation processes are used to separate cobalt, manganese, nickel, and lithium, then the useful elements can be recovered, but the processing cost increases significantly
Solution Approach 1:
The invention changes the processing temperature parameter to low-temperature conditions, which reduces energy costs. Additionally, the method uses readily available chemical reagents for dissolution and precipitation that are more cost-effective than conventional high-temperature processing equipment and materials, thereby reducing overall processing costs while maintaining high recovery rates
Solution Approach 2:
The patent employs inexpensive chemical reagents such as common acids and bases for the dissolution and precipitation processes. These consumable chemicals replace expensive high-temperature processing requirements, providing a cost-effective pathway for element recovery from spent battery materials
3Manufacturing precision
If high-temperature processes are used for separating and recombining desirable materials, then pure separated materials can be obtained, but the process becomes energy-intensive and impractical for widespread application
Solution Approach 1:
The patent replaces thermal separation mechanisms with chemical separation mechanisms. By using selective dissolution followed by controlled precipitation, the invention achieves effective separation and purification of valuable elements at low temperatures, making the process practical for widespread industrial application while maintaining adequate material purity
Solution Approach 2:
The invention changes the operating temperature parameter from high to low, and uses chemical concentration and pH control parameters to achieve separation. This parameter transformation converts an energy-intensive thermal process into a chemically-driven process that is more suitable for large-scale implementation
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 method results in a high-efficiency, economically viable recycling process that reduces waste, conserves energy, and provides a cost-effective supply of active cathode materials for new batteries, addressing the environmental and economic challenges of lithium-ion battery recycling.
Implementation Method 1
dissolved in a solution for extracting the useful elements Co (cobalt), Ni (nickel), Mn (manganese), Li (lithium), and Fe (iron) from mixed cathode materials
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), Mn (manganese), Li (lithium), and Fe (iron) to produce active cathode materials for new batteries. The solution includes compounds of desirable materials such as cobalt, nickel 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.