▎ 摘　　要

NOVELTY - Lithium is extracted from aqueous lithium source by removing dissolved calcium ions (Ca2+) and/or dissolved magnesium ions (Mg2+) by nanofiltration (S1) from aqueous lithium source containing dissolved lithium ions (Li+), dissolved carbonate ions (CO32-), dissolved Ca2+, and/or dissolved Mg2+, removing water from aqueous lithium source by a reverse osmosis (S2), and electrochemically extracting (S3) dissolved lithium ions Li+ from aqueous lithium source in an electrochemical cell which comprises, in a housing, working electrode, counter electrode, and aqueous lithium source as electrolyte separating the working electrode and the counter electrode. Working electrode comprises lithium storage material, and binder and electrically conductive additive. Dissolved Li+ are intercalated from aqueous lithium source into Li storage material of working electrode. USE - The method is useful for extracting lithium from an aqueous lithium source containing dissolved lithium, carbonate, calcium, and/or magnesium ions. ADVANTAGE - The method enables efficient and long term stable lithium extraction from aqueous lithium sources containing dissolved lithium, carbonate, calcium and/or magnesium ions with aid of nanofiltration and reverse osmosis membranes. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for lithium-recovery unit comprising nanofiltration unit, reverse osmosis unit, and electrochemical cell. Nanofiltration unit is configured to remove dissolved Ca2+ and/or dissolved Mg2+ from aqueous lithium source containing dissolved Li+, dissolved CO32-, dissolved Ca2+, and/or dissolved Mg2+. Reverse osmosis unit is configured to remove water from the aqueous lithium source. Electrochemical cell is configured to electrochemically extract dissolved Li+ from aqueous lithium source, where dissolved Li+ are intercalated from the aqueous lithium source into the storage material of the working electrode using the aqueous lithium source as the electrolyte.