Synergistic Interfacial Design of Cation Exchange Membranes via Sequential Electro-Assembly for High-Efficiency Lithium Separation
Zhibo Zhang, Geting Xu, Yangbo Qiu, Junbin Liao, Tong Mu, Wanji Zhou, Yunfang Gao, Jianquan Weng, Jiangnan Shen
TL;DR
A new in-situ method for making ion-exchange membranes improves lithium separation efficiency from complex salt solutions.
Contribution
A novel electro-assembly strategy for fabricating selective membrane layers directly in electrodialysis stacks.
Findings
The method achieves a Li+/Mg2+ selectivity of 107.9.
The membrane retains a selectivity of 47 after 10 cycles in real salt lake brine.
The fabricated membrane shows enhanced ion transport and stability.
Abstract
The industrial application of modified ion-exchange membranes is limited by complex, discontinuous ex-situ processes. This study introduces an in-situ electro-assembly strategy that enables the direct fabrication of a selective layer within an electrodialysis stack without disassembly. By utilizing a programmed current reversal to orchestrate the sequential deposition of polyethyleneimine (PEI), glutaraldehyde cross-linking, and polystyrene sulfonate (PSS) adsorption, we achieve meticulous interfacial engineering on a commercial cation exchange membrane. Comprehensive characterization confirms the successful construction of a hydrophilic, charge-tuned multilayer, which enhances ion transport kinetics and raises the limiting current density. This method culminates in a membrane with an exceptional Li+/Mg2+ selectivity of 107.9 and robust stability, retaining a significant selectivity of…
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Taxonomy
TopicsMembrane-based Ion Separation Techniques · Membrane Separation Technologies · Fuel Cells and Related Materials