Method of manufacturing negative electrode

A method of manufacturing a negative electrode, comprising:

• applying a negative electrode slurry on a negative electrode current collector and subjecting the applied negative electrode slurry to a first roll-pressing to form a negative electrode active material layer;
• pre-lithiating the negative electrode active material layer to form a pre-lithiated negative electrode active material layer;
• and
• subjecting the pre-lithiated negative electrode active material layer to a second roll-pressing,
• wherein the negative electrode active material layer comprises a silicon-based active material,
• wherein a ratio (p1/p2) of porosity (p1) of negative electrode active material layer after the first roll-pressing to porosity (p2) of negative electrode active material layer after the second roll-pressing is in a range of 1.10-1.51,
• wherein the porosity of the negative electrode active material layer after the first roll-pressing is in a range of 35.4% to 48.1%, and
• wherein the silicon-based active material comprises a compound represented by Chemical Formula 1: