▎ 摘　　要

NOVELTY - Preparation of composite modified electrode material involves adding a lithium source and graphene oxide into 50 %mass ethanol solution, stirring to obtain a lithium source/graphene oxide mixed solution containing 0.2-1 g/L lithium and 1-3 g/L graphene oxide, adding lithium extracting electrode active material, obtaining a mixed solution (A), dissolving titanium source in a mixed solution of acetic acid and absolute ethanol to obtain a mixed solution (B), mixing the mixed solution (A) and the mixed solution (B) to form a gel, heating to 70-85 degrees C for 1-3 hours, drying, roasting for 10 hours at 550 degrees C to obtain a graphene oxide/titanium lithium-ion sieve coated modified electrode active material, mixing with dopamine solution in the liquid-solid mass ratio of 5-10:1, carrying out poly-dopamine coating modification, filtering, washing, and drying. USE - Preparation of composite modified electrode material for electrochemically extracting lithium in Salt Lake (all claimed). ADVANTAGE - The method enables simple preparation of electrode material having improved selectivity, high extraction rate, and high efficiency. DETAILED DESCRIPTION - Preparation of composite modified electrode material involves adding a lithium source and graphene oxide into 50 %mass ethanol solution, stirring to obtain a lithium source/graphene oxide mixed solution containing 0.2-1 g/L lithium and 1-3 g/L graphene oxide, adding lithium extracting electrode active material, obtaining a mixed solution (A), dissolving titanium source in a mixed solution of acetic acid and absolute ethanol to obtain a mixed solution (B), mixing the mixed solution (A) and the mixed solution (B) to form a gel, heating to 70-85 degrees C for 1-3 hours, drying, roasting for 10 hours at 550 degrees C to obtain a graphene oxide/titanium lithium-ion sieve coated modified electrode active material, mixing with dopamine solution in the liquid-solid mass ratio of 5-10:1, carrying out poly-dopamine coating modification, filtering, washing, and drying. The molar ratio of the electrode active material for extracting lithium and lithium in the lithium source is 5-20:1 and the molar ratio of lithium in the lithium source and the titanium in the titanium source is 2:1. INDEPENDENT CLAIMS are included for the following: (1) composite modified electrode active material for extracting lithium; (2) electrode for electrochemically extracting lithium comprising the composite modified electrode active material; and (3) preparation of the electrode for electrochemically extracting lithium, which involves pulping composite modified electrode active material, 10-15 %mass conductive agent, 10-30 %mass pore-forming agent, 8-15 %mass polyvinylidene fluoride, and 150-200 %mass N-methylpyrrolidone to form a slurry, uniformly coating the slurry on a current collector, drying, and soaking in water.