Mechanochemical Lithium Recycling for Low-Energy Li-Ion Recovery
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Solution Overview
Problem
Current lithium-ion battery recycling methods are inefficient, costly, and environmentally hazardous, with existing technologies facing challenges such as high energy consumption, hazardous gas emissions, and impurity issues in lithium recovery.
Innovation Solution
A mechanochemical method involving mechanical processing of lithium-ion battery cathode materials with aluminum, followed by aqueous treatment and heating to produce high-purity lithium carbonate without corrosive leachates or high temperatures, allowing for efficient and scalable lithium recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrometallurgical methods are used for lithium recycling, then metal recovery is achieved, but high energy consumption and hazardous gas emissions occur
Solution Approach 1:
The patent replaces thermal processing (pyrometallurgy) with mechanical ball milling to achieve lithium recovery. The mechanochemical process uses mechanical energy to reduce lithium compounds to metallic lithium, eliminating the need for high-temperature smelting and associated energy consumption while maintaining effective metal recovery
Solution Approach 2:
The patent changes the processing parameters from high-temperature thermal conditions to ambient or moderate temperature mechanical conditions. By altering the energy input mode from thermal to mechanical, the process achieves lithium recovery without the hazardous gas emissions and excessive energy consumption characteristic of pyrometallurgical methods
2Reliability
If hydrometallurgical processes are used for lithium recycling, then high metal recovery rates are achieved, but highly corrosive leachates are required
Solution Approach 1:
The patent replaces chemical leaching (hydrometallurgy) with mechanical ball milling. The mechanochemical reduction process uses physical mechanical energy combined with chemical reactions to recover lithium without requiring corrosive acids or bases, thereby eliminating the harmful effects of corrosive leachates while maintaining high metal recovery rates
Solution Approach 2:
The patent employs water as a simple, non-corrosive liquid medium instead of expensive and hazardous chemical leachates. This substitution uses an inexpensive, environmentally benign substance to achieve the same extraction function without the harmful corrosive effects
3Object-affected harmful factors
If biohydrometallurgical methods are used for lithium recycling, then environmental hazards are reduced, but processing time increases significantly
Solution Approach 1:
The patent replaces slow biological processes with rapid mechanochemical reactions. The ball milling process induces immediate chemical reactions through mechanical energy input, achieving lithium recovery in minutes or hours rather than the days required by biohydrometallurgical methods, while maintaining environmental safety
Solution Approach 2:
The patent employs periodic mechanical impacts through ball milling to drive rapid chemical reactions. The intermittent mechanical energy input creates repeated stress and activation events that accelerate the reduction process, achieving fast lithium recovery without the slow continuous processing required by biological methods
4Reliability
If conventional recycling methods are used, then lithium recovery is achieved, but costs remain high and profitability is limited
Solution Approach 1:
The patent uses inexpensive materials and simple equipment for lithium recovery. The ball milling process requires only mechanical energy and basic reagents rather than expensive chemical agents, high-temperature furnaces, or complex separation systems, thereby significantly reducing manufacturing and operational costs while maintaining effective lithium recovery
Solution Approach 2:
The patent replaces expensive thermal and chemical processing systems with a simple mechanical ball milling system. This substitution eliminates the need for high-temperature equipment, corrosive chemical handling infrastructure, and complex process control systems, thereby reducing capital investment and operational costs while achieving reliable lithium recovery
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 enhances lithium recycling efficiency, reduces costs, and minimizes environmental impact by achieving high-purity lithium carbonate production, applicable to various lithium-ion battery chemistries and electrode technologies.
Implementation Method 1
subjecting a cathode material of the lithium-ion battery containing lithium ions in an active cathode material to a mechanical processing in air in the presence of aluminum, thereby mechanochemically reducing the active cathode material
Implementation Method 2
adding water to the mechanochemically processed material of step (i), thereby providing an aqueous mixture
Implementation Method 3
heating the aqueous mixture to a temperature of 300°C or higher, thereby providing a mixture of dissolved lithium carbonate (Li2CO3) and insoluble impurities
Implementation Method 4
separating the insoluble impurities from the mixture, and evaporating water to obtain lithium carbonate (Li2CO3)
Data Source
Figure 1
Figure 2~3
Figure 4~5(d)
AI summary
The present invention relates to a mechanochemically induced method for recycling lithium from Li-ion batteries which can be universally applied, and which is highly efficient due to a specific heating step.