Negative electrode for lithium secondary battery, method for pre-lithiation thereof, and lithium secondary battery including same

A method for pre-lithiation of a negative electrode for a lithium secondary battery, the method comprising:

• forming a first negative electrode active material layer on a surface of a negative electrode current collector, wherein said first negative electrode active material layer comprises a silicon-based negative electrode active material and is selected from the group consisting of silicon, a silicon-based alloy, and SiOx, wherein 0<x≤2;
• forming a lithium metal layer comprising a lithium metal on a surface of the first negative electrode active material layer;
• forming a second negative electrode active material layer on a surface of the lithium metal layer, wherein said second negative electrode active material layer comprises a silicon-based negative electrode active material and is selected from the group consisting of silicon, a silicon-based alloy, and SiOx, wherein 0<x≤2, wherein said second negative electrode active material is the same or different from said first negative electrode active material;
• and
• impregnating the resulting negative electrode for the lithium secondary battery with a pre-lithiation solution to perform pre-lithiation, wherein the pre-lithiation solution comprises an ionizable lithium salt and an organic solvent, and the impregnation is performed at a temperature of 20° C. to 70° C. for 2 hours to 36 hours.