LITHIUM SECONDARY BATTERY WITH IMPROVED HIGH TEMPERATURE CONSERVATION PROPERTY, COMPRISING ELECTRODE CONTAINING METAL HYDROXIDE, AND ELECTROLYTIC SOLUTION CONTAINING TWO ADDITIVES

摘要

PURPOSE: A lithium secondary battery is provided to minimize the capacity reduction and to prevent the impedance increase of battery upon high temperature storage. CONSTITUTION: The lithium secondary battery comprises a positive electrode, a negative electrode and an electrolytic solution, wherein any one or both of the positive electrode and the negative electrode contain a metal hydroxide, and the electrolytic solution contains a first additive represented by the formula 1 and a second additive having a structure represented by the formula 2, the formula 3 or the formula 4, in which R is a C1-C5 alkenyl group or a C1-C5 alkyl group, and each of R1 and R2 is independently selected from the group consisting of hydrogen, a C1-C5 alkenyl group, a C1-C5 alkyl group, a halogen, and a phenyl group or phenoxy group which are non-substituted or substituted by a C1-C5 alkyl group or halogen.