LITHIUM SECONDARY BATTERY HAVING ENHANCED HIGH-TEMPERATURE SAFETY

The present invention describes an electrolyte composition with improved high temperature safety and a lithium secondary battery including the same, and the electrolyte composition containing a primary additive comprising a compound represented by Formula 1, and specific amount of a secondary additive that contains one or more of the cyclic carbonates, can not only reduce the generation of gas during secondary battery charge-discharge, but also improve storage characteristics and the lifespan characteristics under a high temperature condition by strengthening the SEI coating film on the surface of an electrode.