LITHIUM SECONDARY BATTERY

摘要

A lithium secondary battery is provided to lower the reactivity of a negative electrode and to stabilize the surface by forming a polymer layer on a negative electrode and inhibiting the side reaction at the interface between a negative electrode and an electrolyte, thereby improving the lifetime of a battery. A lithium secondary battery comprises a negative electrode which comprises a lithium-vanadium-based oxide represented by Li_x M_y V_z O_2+d and a carbon-based material capable of intercalating/deintercalating a lithium ion; a positive electrode which a positive electrode active material capable of intercalating/deintercalating a lithium ion; and an electrolyte which comprises a monomer containing an alkylene oxide and having one reactive double bond, a lithium salt and a nonaqueous organic solvent, wherein 0.1<=x<=2.5; 0<=y<=0.5; 0.5<=z<=1.5; 0<=d<=0.5; and M is at least one metal selected from the group consisting of Al, Cr, Mo, Ti, W and Zr.