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Inorganic solid electrolyte membranes for electrochemical direct Li-extraction from low-grade brine
Guiying Tian, Na Kang, Tuo Li, Jiayi Li, Liuxue Wang, Miaoke Ji, Jun Xiang, Wei Du, Na Tang*
https://doi.org/10.1016/j.cjsc.2026.101038
Solid electrolyte membrane; Low-grade brine; Ion sieving membrane; Direct Li-extraction; Interfacial ion partitioning
ABSTRACT
With accelerated global transition toward sustainable energy, lithium and its derivatives are critical materials of energy storage systems. However, current Li-extraction processes are energy-intensive and inapplicable for low-grade brine, and developing direct Li-extraction is therefore crucial to ensuring sustainable lithium supply. Oxide solid electrolyte membranes (LSEMs) with their stable crystal channels and exclusive Li+ transport show great potential in achieving ultrahigh ionic sieving for Li-recovery. This review systematically summarizes recent advances in LSEMs for Li recovery from brine, especially for crystal structures of Na Super Ionic Conductor (NASICON)-type, perovskite-type, and garnet-type solid electrolytes, and elucidates their physicochemical ion-sieving mechanisms. Key challenges are also highlighted, including the trade-off between Li+ selectivity and ionic flux, confined sieving mechanisms, insufficient membrane flexibility, and poor long-term interfacial stability. Future directions including crystal interface regulation, counter-ion channel design, and confined optimization are proposed to enable efficient Li-extraction from low-grade brine and support the global transition toward sustainable energy.
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CN 35–1112/TQ, ISSN 0254–5861, Online ISSN: 2949-768X Copyright @ 2022 Chinese Journal of Structural Chemistry-www.Chinese Journal of Structural Chemistry.net. All Rights Reserved 闽ICP备2022002645号-1