Synthesis of ZIF-62 Glass and Solid-state Lithium Superconductor Composite Membranes for Electrodialytic Lithium Extraction.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 42509241.
- Also identified by DOI 10.1038/s41467-026-75929-2 and PMC identifier 13408082.
- Licence recorded as CC BY-NC-ND.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Lithium superionic conductors such as Li<sub>3x</sub>La<sub>2/3-x</sub>TiO<sub>3</sub> (LLTO) enable rapid and selective lithium-ion transport through their crystalline frameworks and have been widely explored for lithium extraction. However, their implementation in membrane-based separations is hindered by the need for high-temperature sintering ( > 1000 °C), which leads to high energy consumption and potential lithium volatilization, thereby compromising structural integrity and scalability. Here, we report a structurally integrated composite membrane by embedding LLTO nanoparticles into a ZIF-62 glass matrix via a low-temperature melt-casting strategy, yielding a dense, defect-free membrane with intimate interfacial integration and improved mechanical robustness. Systematic investigations across a wide composition range reveal effective transport channels are highly restricted until a critical content is reached, after which an extensive interconnected LLTO network forms. The optimized membrane exhibits high lithium selectivity and delivers a Li/Mg selectivity of up to ~59,000 in Red Sea water under electrochemical operation, while maintaining stable lithium extraction performance across diverse natural brines. This study establishes a scalable membrane design strategy with good processability, offering broader opportunities for not only lithium extraction, but also ion-selective membranes in electrochemical separations and energy storage systems.