NONINCENDIVE ELECTROLYTE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY INCLUDING SAME

Disclosed is a nonincendive electrolyte for lithium secondary battery, the electrolyte using an organic solvent mixture including a first solvent containing fluorine and sulfur, a second solvent that is a linear carbonate-based compound containing fluorine, a third solvent that is a linear ester-based compound containing fluorine, and a fourth solvent that is a cyclic carbonate-based compound. Thus, the electrolyte is nonflammable or flame-retardant, thereby preventing a lithium secondary battery from catching on fire or exploding. That is, the electrolyte greatly improves the safety of a lithium secondary battery, allows the high voltage charge of a lithium secondary battery, and prevents the degradation of battery performance of a lithium secondary battery. In addition, a lithium secondary battery including the electrolyte is disclosed.