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Ship-lock LMO||PPy dual-membrane system for synchronous electrochemically switched extraction of LiCl from salt lake brine

Authors： GAO Xinyu1, GUO Huanhuan1, GAO Fengfeng1,2,3,5, HAO Xiaogang1,2,3, JIAN Xuan4, XIAN Yunchang5, ZHAO Rui5

Units： 1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. Yuanli (Hangzhou) Separation Technology Co., Ltd., Hangzhou 311607, China;3. Shanxi Kehua Technical Service Co., Ltd., Taiyuan 030000, China; 4. Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan’an University, Yan’an 716000, China; 5. Shanxi Yangmei Chemical Machinery (Group) Co., Ltd., Taiyuan 030032, China

KeyWords： LMO||PPy dual-membrane system; ship-lock electrically switched ion permselective (SL-ESIP); high magnesium-to-lithium ratio; lithium extraction; membrane separation

ClassificationCode：TQ150.5

year,volume(issue):pagination： 2026,46(1):11-26

Abstract：

To address the challenge of efficient lithium extraction from salt lake brines with high magnesium-to-lithium ratios, this study constructed an asymmetrically heterostructured lithium manganate||polypyrrole (lithium manganate || polypyrrole，LMO||PPy) dual-membrane system. By combining the ship-lock electrically switched ion permselective (SL-ESIP) technology, achieving highly efficient separation and extraction of LiCl. An asymmetric composite membrane with single-sided hydrophilic/single-sided hydrophobic properties was prepared by adjusting the polyacrylic acid (PAA) content (55%, mass fraction), and the LiCl permeation flux was significantly enhanced by optimizing the number of membrane-electrode wire connection (3-wire connection) and chamber spacing (2 mm). Experimental results demonstrated that in a pure lithium solution, the Li+ permeation flux reached 0.109 mol/(m2·h). In simulated brine with a Mg/Li mass ratio of 20∶1, the Li+ permeation flux stabilized at 0.055 mol/(m2·h) after 10 cycles, with a separation factor of 18.03 for Mg2+/Li+, showcasing excellent cycling stability and selectivity. Therefore, the ship-lock LMO||PPy dual-membrane system presents an efficient technical solution for the continuous and synchronous extraction of LiCl.

Funds：

国家自然科学基金联合基金重点项目（U23A20119）; 山西省基础研究计划（202403021221039）

AuthorIntro：

高新宇（2002-），女，山西临县人，硕士研究生，主要研究方向为电控离子交换技术及电控膜分离装置.*通讯作者，高凤凤，E-mail：gaofengfeng@tyut.edu.cn；郝晓刚，E-mail：xghao@tyut.edu.cn

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