Additive for non-aqueous liquid electrolyte, non-aqueous liquid electrolyte and lithium secondary battery comprising the same

摘要

Provided are a non-aqueous electrolyte including a toluene sulfonyl isocyanate-based additive and a lithium secondary battery comprising the same. The lithium secondary battery including a non-aqueous electrolyte additive of the present invention can improve a high-rate discharge capacity maintenance rate and swelling property at high temperature.