| abstract |
The present invention relates to a lithium secondary battery, comprising: a positive electrode including a first positive electrode active material represented by Chemical Formula 1 and / or Chemical Formula 2 and a second positive electrode active material represented by Chemical Formula 3; A negative electrode including a negative electrode active material; And it provides a lithium secondary battery comprising an electrolyte solution.n n n [Formula 1]n n n Li a Ni b Mn c M d O 2 n n n (In Formula 1, 0.90 ≦ a ≦ 1.2, 0.5 ≦ b ≦ 0.9, 0 <c <0.4, 0.001 ≦ d ≦ 0.2,n n n M is Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Tl, Si, Ge, Sn, P, As, Sb, Bi, S, Se, At least one of the materials selected from the group consisting of Te and Po)n n n [Formula 2]n n n Li a Ni b Co c Mn d M e O 2 n n n (In Formula 2, 0.90 ≦ a ≦ 1.2, 0.5 ≦ b ≦ 0.9, 0 <c <0.4, 0 <d <0.4, 0.001 ≦ e ≦ 0.2,n n n M is Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Tl, Si, Ge, Sn, P, As, Sb, Bi, S, Se, At least one of the materials selected from the group consisting of Te, Po)n n n [Formula 3]n n n Li a CoM b O 2 n n n (In Formula 3, 0.90 ≦ a ≦ 1.2, 0.001 ≦ b ≦ 0.2,n n n M is Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Tl, Si, Ge, Sn, P, As, Sb, Bi, S, Se, At least one of the materials selected from the group consisting of Te and Po)n n n The lithium secondary battery of the present invention uses a positive electrode active material mixed with a nickel-based compound and a cobalt-based compound in an appropriate ratio while increasing its capacity by 2-9%, and satisfies both room temperature life, high temperature life, and safety (penetration, overcharge penetration). It is a battery.n n n n Lithium Secondary Battery, Mixed Cathode Active Material, LiNiMnMO, LiNiCoMnMO, LiCoMO |