Redox Membrane for Selective Lithium Extraction From Brines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium extraction methods from liquid and solid sources are time-intensive, multi-step processes with high energy requirements and excessive waste streams, making them inefficient and costly.
Innovation Solution
The development of an electrochemically active redox membrane that combines ion-absorbing and membrane functionalities, allowing for the selective extraction and release of lithium ions, reducing the need for multiple processing steps and minimizing waste by directly producing high-purity lithium products from low-purity sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional multi-step extraction processes are used, then lithium can be extracted from liquid sources, but the process is time-intensive and requires high energy consumption
Solution Approach 1:
The patent combines multiple extraction steps into a single integrated redox membrane system. The membrane performs both separation and concentration functions simultaneously, eliminating the need for sequential solvent extraction, precipitation, and filtration steps. This merging of functions directly reduces process time while maintaining lithium extraction efficiency.
Solution Approach 2:
The redox membrane system enables continuous lithium extraction through electrochemical reactions. By applying a potential difference, lithium ions are continuously transported from the brine side to the product side without interruption, replacing batch processes with continuous operation to reduce overall process time.
2Quantity of substance
If conventional multi-step extraction processes are used, then lithium can be extracted from liquid sources, but energy consumption is high
Solution Approach 1:
The patent replaces mechanical separation processes (evaporation, filtration, centrifugation) with electrochemical transport through the redox membrane. The electrochemical potential drives lithium ion transport directly, eliminating the need for energy-intensive mechanical operations and thermal processing steps.
Solution Approach 2:
The system changes the operating parameters by using electrochemical potential (voltage) instead of thermal energy (heat) or mechanical energy. The redox reactions at the membrane surfaces enable lithium transport driven by electrical potential, fundamentally changing the energy input mode to reduce overall energy consumption.
3Quantity of substance
If conventional extraction methods are used, then lithium can be separated from brines, but excessive waste streams are generated
Solution Approach 1:
The redox membrane selectively extracts only lithium ions from the complex brine matrix, leaving other ions (Na+, Mg2+, Ca2+, Cl−, SO42−) in the original brine stream. This selective extraction minimizes waste generation by separating only the target substance rather than processing entire solution volumes through multiple steps.
Solution Approach 2:
The system recovers lithium in a concentrated, high-purity form while the depleted brine can be returned to the environment or reused. The electrochemical process concentrates lithium on the product side while the feed side brine loses minimal volume, effectively recovering the valuable metal with minimal waste disposal requirements.
4Quantity of substance
If ion-absorbing media are used, then lithium can be selectively extracted, but the process requires multiple steps including saturation, removal, rinsing, and release
Solution Approach 1:
The redox membrane integrates the absorption and release functions into a single device. Lithium ions are absorbed on the feed side through reduction reactions and simultaneously released on the product side through oxidation reactions, eliminating the need for separate saturation, removal, rinsing, and release steps required by conventional absorbing media.
Solution Approach 2:
The membrane performs multiple functions simultaneously: it acts as a selective barrier, an electrochemical reactor, and a transport medium. The redox-active material in the membrane enables both lithium uptake from brine and release into product solution within the same structure, reducing process complexity while maintaining high selectivity.
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 efficient, scalable, and cost-effective lithium extraction with reduced energy consumption, achieving high lithium purity and throughput while minimizing waste streams, and can be applied to various lithium-containing solutions, including brines and recycled materials.
Implementation Method 1
extracting lithium from an aqueous solution with an LCO redox membrane. The LCO redox membrane extracts lithium ions from the aqueous solution
Implementation Method 2
The extracted lithium is then released from the LCO redox membrane into an organic solution
Data Source
AI summary
An apparatus, system and redox membrane for efficient lithium-ion extraction from natural salt waters or geothermal brines or manmade sources such as from lithium battery recycling are provided. The redox membrane is selective for lithium ions over other spectator ions making the system capable of selectively extracting lithium-ions from multiple-ion source solutions. The system uses the redox membrane as an electrochemically active material acting as a Li-selective membrane for direct lithium extraction from a lithium-ion source. The redox membrane is also not porous to solvents and is stable in caustic and high temperature environments. The features of the redox membrane and system allow the recovery of lithium from low purity sources and the production of higher purity products at reduced costs and process steps over conventional processes.