Negative electrode for rechargeable lithium battery, method of preparing same and rechargeable lithium battery including same

A rechargeable lithium battery, comprising:

• a negative electrode comprising:
• a negative active material layer comprising a polymer binder wherein the binder is a copolymer of the repeating units represented by the following Chemical Formula 1 and methylvinyl triethylene glycol;
• and a composite of Si and C negative active material;
• and
• a current collector supporting the negative active material layer,
• wherein the binder is included in an amount of 1 wt % to 10 wt % based on the total weight of the negative active material layer, and
• the polymer binder has a weight average molecular weight of 100,000 to 1,000,000:
• wherein, R1 and R2 are the same or are different, and are hydrogen, OH or OOH;
• a positive electrode including a positive active material;
• and
• an electrolyte.

A method of negative electrode for a rechargeable lithium battery, comprising:

• mixing a polymer binder wherein the binder is a copolymer of the repeating units represented by the following Chemical Formula 1 and methylvinyl triethylene glycol;
• or includes a repeating unit of the following Chemical Formula 2 and a composite of Si and C negative active material in a solvent to prepare a negative active material composition;
• applying the negative active material composition on a current collector;
• and
• heat-treating the current collector applied with the negative active material composition at 80° C. to 160° C.:
• wherein, R1 and R2 are the same or are different, and are hydrogen, OH or OOH.