Electrolyte for lithium secondary battery and lithium secondary battery including the same

• Main Authors: KIM YONG-SHIK, PARK NA-RAE, KIM JIN-SUNG, KIM JIN-BUM
• Format: Patent
• Language: English
• Published: 05.06.2008
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

An electrolyte for a lithium secondary battery, and a lithium secondary battery including the same are provided. The electrolyte includes: a cyclic ester; an organic solvent including a nitrile-containing solvent represented by Formula 1 at a content ranging from 1 to 5% by volume; and a lithium salt, R-C≡N (1) wherein R is selected from the group consisting of a C1 to C10 aliphatic hydrocarbon, a C1 to C10 halogenated aliphatic hydrocarbon, a C6 to C10 aromatic hydrocarbon, and a C6 to C10 halogenated aromatic hydrocarbon. The electrolyte can improve swelling characteristics and discharge capacity characteristics at a low temperature, and realize equal or better performance in characteristics such as capacity, life span and the like, as compared to a conventional carbonate-containing electrolyte.