Negative electrode for lithium secondary battery, method for preparing negative electrode for lithium secondary battery, and lithium secondary battery comprising negative electrode

A negative electrode for a lithium secondary battery, comprising:

• a negative electrode current collector layer;
• a first negative electrode active material layer on one surface or both surfaces of the negative electrode current collector layer;
• and
• a second negative electrode active material layer on a surface opposite to a surface of the first negative electrode active material layer facing the negative electrode current collector layer,
• wherein the first negative electrode active material layer comprises a first negative electrode active material layer composition comprising a first negative electrode active material, and the second negative electrode active material layer comprises a second negative electrode active material layer composition comprising a second negative electrode active material,
• the first negative electrode active material comprises one or more selected from the group consisting of SiOx, wherein x=0, and SiOx, wherein 0<x<2, and comprises 95 parts by weight or more of the SiOx, wherein x=0 based on 100 parts by weight of the first negative electrode active material,
• the second negative electrode active material comprises a one or more selected from the group consisting of a carbon-containing active material, a silicon-containing active material, a metal-containing active material configured to form an alloy with lithium and a lithium-containing nitride,
• a weight loading amount (A) of the first negative electrode active material layer composition and a weight loading amount (B) of the second negative electrode active material layer composition satisfy the following Equation 1:
• 10≤(B/(A+B))×100(%)≤50, and [Equation 1]
• the weight loading amount (A) and weight loading amount (B) are in terms of mg/cm2 and wherein the weight loading amount (A) is in a range of 40 mg/25 cm2 or more and 140 mg/25 cm2 or less and the weight loading amount (B) is in a range of 10 mg/25 cm2 or more and 60 mg/25 cm2 or less.