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

An electrolyte for a secondary battery, the electrolyte comprising:

• a lithium salt;
• a nonaqueous organic solvent;
• and
• a cyclic fluorophosphonate compound represented by the following Chemical Formula 1:
• wherein
• R1 and R2 are independently of each other hydrogen, C1-C10alkyl, halogen, C1-C10alkoxy, C3-C10cycloalkyl, or C6-C20aryl, and the alkyl, alkoxy, cycloalkyl, or aryl may be further substituted by one or more selected from the group consisting of C1-C10alkyl, halogen, haloC1-C10alkyl, C1-C10alkoxy, C1-C10alkoxyC1-C10alkyl, C3-C10cycloalkyl, and C6-C20aryl;
• A is —(CRaRb)m—, C3-C10cycloalkylene, or C6-C20arylene, and the cycloalkylene or arylene may be further substituted by one or more selected from the group consisting of C1-C10alkyl, halogen, haloC1-C10alkyl, C1-C10alkoxy, C1-C10alkoxyC1-C10alkyl, C3-C10cycloalkyl, and C6-C20aryl;
• Ra and Rb are independently of each other hydrogen, C1-C10alkyl, halogen, C1-C10alkoxy, C3-C10cycloalkyl, or C6-C20aryl, and the alkyl, alkoxy, cycloalkyl, or aryl may be further substituted by one or more selected from the group consisting of C1-C10alkyl, halogen, haloC1-C10alkyl, C1-C10alkoxy, C1-C10alkoxyC1-C10alkyl, C3-C10cycloalkyl, and C6-C20aryl;
• and
• m is an integer of 1 to 5.