ELECTROLYTE COMPOSITION HAVING HIGH SAFETY WHEN OVERCHARGED AND LOW SWELLING PROPERTY AT A HIGH TEMPERATURE

摘要

An electrolyte composition comprising a nitrogen-containing compound, biphenyl, propane sultone, an organic solvent and a lithium salt is advantageously used for the preparation of a lithium secondary battery having low swelling level at high temperature, and high overcharge-safety, cycling life and rate capability properties.