| abstract |
A cathode comprising a cathode active material; A negative electrode comprising a negative electrode active material; And a non-aqueous electrolyte, wherein the positive electrode active material comprises a compound represented by the following formula (1), and the negative active material comprises a compound represented by the following formula (2), wherein the compound represented by the formula 3 to 30% by weight based on 100% by weight of the positive electrode active material, and 3 to 5% by weight based on 100% by weight of the negative electrode active material. [Chemical Formula 1] Li x1 Co 1 - y M y O 2 (In the formula 1, 1.05 <x1 <1.10, 0.03 <y <0.05, M includes one selected from the group consisting of B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu, Al, (2) SiO x 2 (In the formula (2) 0.95? X2? 1.1) |