Method for preparing positive active material for rechargeable lithium battery and rechargeable lithium battery including positive active material

摘要

A rechargeable lithium battery includes a non-aqueous electrolyte, a negative electrode including a silicon-based negative active material, and a positive active material including a compound represented by a Chemical Formula 1, LiCo 1-y M y O 2+x , wherein, -0.2 ‰¤ x ‰¤ 0.2, 0 < y ‰¤ 0.25, and M includes Ni and at least one metal selected from Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu, and Al.