Electrolyte for lithium secondary battery and lithium secondary battery comprising same

A non-aqueous electrolyte for a lithium secondary battery comprising:

• a lithium salt;
• a non-aqueous organic solvent comprising a cyclic carbonate and a chain carbonate mixed in a volume ratio of 1:1 to 1:9;
• and
• at least one organic compound selected from a group consisting of the compounds represented by the following Formulae (3) or (4):
• R9—SO3—Si(CmH2m+1)3 (3)
• CnX2n+1—SO3—Si(CmH2m+1)3 (4)
• where R9 is selected from the group consisting of primary, secondary, and tertiary alkyl groups, alkenyl groups, and aryl groups;
• X is hydrogen or halogen;
• and n and m are numerical values ranging from 0 to 3.

The A non-aqueous electrolyte for a lithium secondary battery comprising:

• a lithium salt;
• a non-aqueous organic solvent comprising a cyclic carbonate selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), and mixtures thereof;
• and
• at least one organic compound selected from a group consisting of the compounds represented by the following Formulae (3) or (4):
• R9—SO3—Si(CmH2m+1)3 (3)
• CnX2n+1—SO3—Si(CmH2m+1)3 (4)
• where R9 is selected from the group consisting of primary, secondary, and tertiary alkyl groups, alkenyl groups, and aryl groups;
• X is hydrogen or halogen;
• and n and m are numerical values ranging from 0 to 3.

A non-aqueous electrolyte for a lithium secondary battery comprising:

• a lithium salt;
• a non-aqueous organic solvent comprising a mixture of a carbonate-based solvent and an aromatic hydrocarbon solvent;
• and
• at least one organic compound selected from a group consisting of the compounds represented by the following Formulae (3) or (4):
• R9—SO3—Si(CmH2m+1)3 (3)
• CnX2n+1—SO3—Si(CmH2m+1)3 (4)
• where R9 is selected from the group consisting of primary, secondary, and tertiary alkyl groups, alkenyl groups, and aryl groups;
• X is hydrogen or halogen;
• and n and m are numerical values ranging from 0 to 3.