Polymer Thin-Film FCDI Cell for Selective Lithium Separation
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Solution Overview
Problem
Conventional lithium recovery methods from waste batteries face challenges such as low selectivity, low recovery rate, and high energy consumption, making them inefficient and environmentally harmful.
Innovation Solution
A selective lithium recovery device using flow electrode capacitive deionization with enhanced selectivity for lithium ions, incorporating a selective ion recovery cell with a flow electrode, cation and anion exchange membranes, and a multilayer polymer thin film layer to improve lithium separation and recovery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lithium recovery methods are used, then lithium can be recovered from waste batteries, but the selectivity is low and energy consumption is high
Solution Approach 1:
The patent changes the operating parameters by applying a controlled voltage (0.2-1.6V) to drive selective ion adsorption. By adjusting voltage and pH conditions, the system achieves high lithium selectivity while maintaining low energy consumption, resolving the contradiction between selectivity and energy use.
Solution Approach 2:
The patent introduces an intermediary substance (polymer thin film layer with functional groups) that mediates between the electrolyte and the electrode. This intermediary selectively adsorbs lithium ions through electrostatic interaction, enabling high selectivity without requiring high energy input, thus resolving the contradiction.
2Productivity
If conventional FCDI method is used, then continuous ion recovery is enabled, but lithium selectivity and recovery rate remain low
Solution Approach 1:
The patent applies local quality by creating a polymer thin film layer with specific functional groups (carboxyl, hydroxyl, amino) at the electrode surface. This localized modification enhances lithium ion adsorption capability specifically at the interface, improving both recovery rate and selectivity simultaneously.
Solution Approach 2:
The patent uses composite materials by combining the polymer thin film layer with the flow electrode structure. This composite configuration integrates the selective adsorption capability of the polymer with the continuous flow processing capability, achieving both high productivity and high reliability.
3Reliability
If polymer thin film layer is added to exchange membranes, then lithium selectivity is enhanced, but device complexity increases
Solution Approach 1:
The patent employs flexible shells and thin films by using a polymer thin film layer (50-500 nm thickness) coated on the exchange membrane. This thin film structure provides high lithium selectivity through electrostatic interaction while adding minimal structural complexity, as it is a simple coating rather than a complex multi-layer assembly.
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
The device achieves high lithium selectivity and recovery efficiency, reducing recovery time and cost while being environmentally friendly, capable of recovering lithium from waste batteries, desalination, and wastewater treatment.
Implementation Method 1
Capacitive deionization (CDI) based on the reversible ion adsorption and desorption mechanism
Implementation Method 2
reversible ion adsorption and desorption mechanism
Implementation Method 3
a cation exchange membrane (CEM) arranged between the electrolyte chamber and the anode; and an anion exchange membrane (AEM) arranged between the electrolyte chamber and the cathode
Data Source
AI summary
The present disclosure relates to a device for selectively recovering lithium using flow electrode capacitive deionization, and a method for separating and recovering lithium using the same. The device for selectively recovering lithium and the method for separating and recovering lithium according to the present disclosure have very high selectivity for lithium ions (Li+) such that lithium ions (Li+) can be selectively separated from a mixture including various ions, and the lithium recovery rate and lithium recovery efficiency are very excellent such that the lithium recovery time and cost are reduced, energy consumption is low, and lithium ions (Li+) can be recovered from the waste liquid of a spent battery, and thus, it is environmentally friendly.