Recycled Cathode Material Recovery by Low-Temperature pH Precipitation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional recycling methods for lithium-ion batteries are energy-intensive and costly, requiring high temperatures to separate and recombine cobalt, manganese, nickel, and lithium, which limits their efficiency and environmental sustainability.
Innovation Solution
A low-temperature recycling process that maintains cobalt, manganese, and nickel in a commingled state, using sodium hydroxide to precipitate out the desired materials without breaking down compounds, allowing for the recovery of active cathode materials for new batteries, such as LiNiCoAlO2, by adjusting the pH and adding pure charge materials to achieve the desired ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional high-temperature separation methods are used to separate cobalt, nickel, and manganese, then the materials can be recovered, but energy consumption increases and costs rise
Solution Approach 1:
The patent changes the temperature parameter from high-temperature separation to low-temperature precipitation, fundamentally altering the process conditions. By using pH adjustment instead of thermal separation, the method achieves material recovery without the high energy input required by conventional methods, directly resolving the contradiction between recovery efficiency and energy consumption
Solution Approach 2:
The patent utilizes phase transition through precipitation, where dissolved metal compounds transition from solution phase to solid precipitate phase by adjusting pH. This phase change enables separation and recovery of cobalt, nickel, and manganese without requiring high temperatures, thus reducing energy consumption while maintaining effective material recovery
2Loss of substance
If conventional high-temperature separation methods are used, then materials can be separated, but processing costs increase
Solution Approach 1:
By changing from high-temperature thermal processes to low-temperature chemical precipitation, the patent significantly reduces processing costs. The method uses readily available reagents like sodium hydroxide for pH adjustment instead of expensive high-temperature equipment and operations, achieving cost-effective manufacturing while maintaining high recovery efficiency
Solution Approach 2:
The patent employs inexpensive chemical reagents such as sodium hydroxide for pH adjustment and precipitation, replacing costly high-temperature separation processes. These cheap chemical agents enable effective material recovery without the high capital and operational costs associated with thermal separation equipment and energy
3Loss of substance
If compounds are broken down for separation, then individual elements can be recovered, but the process becomes more complex and energy-intensive
Solution Approach 1:
The patent extracts useful elements from compounds through selective precipitation rather than breaking down the compounds. By adjusting pH, the method selectively precipitates cobalt, nickel, and manganese compounds from solution while leaving other components in solution, achieving element recovery without the complex decomposition and recombination processes required by conventional methods
Solution Approach 2:
The patent uses pH adjustment as an intermediary mechanism to achieve separation. By controlling pH levels, the method enables selective precipitation of different metal compounds without directly breaking them down. This intermediary approach simplifies the process compared to direct thermal decomposition and separation, reducing both complexity and energy requirements
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, achieving high recovery efficiency and commercial viability by producing recycled active cathode materials suitable for new lithium-ion batteries without the need for expensive organic reagents, thus addressing the environmental and economic concerns of lithium-ion battery recycling.
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
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.