CPC H01M 10/0567 (2013.01) [C07F 5/04 (2013.01); C07F 7/0834 (2013.01); C07F 9/65742 (2013.01); H01M 4/364 (2013.01); H01M 4/366 (2013.01); H01M 4/386 (2013.01); H01M 4/387 (2013.01); H01M 4/587 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01); H01M 2300/0025 (2013.01)] | 9 Claims |
1. A lithium secondary battery, comprising:
a negative electrode comprising a negative electrode active material comprising Si or Sn;
a positive electrode comprising a positive electrode active material; and
a non-aqueous electrolyte comprising a non-aqueous organic solvent; a lithium salt; fluoroethylene carbonate; a first additive comprising a compound represented by Chemical Formula 1; and a second additive comprising a compound represented by Chemical Formula 2:
wherein R1 to R6 are independently a substituted or unsubstituted primary, secondary, or tertiary alkyl group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted aryl group,
wherein Rg, Rh, Ri, and Rj are independently a halogen or a halogen substituted or unsubstituted alkyl group or at least two of Rg, Rh, Ri, and Rj are linked with each other to form an oxalate group,
wherein a mixing ratio of the first additive to the second additive is a weight ratio of 10:1 to 0.066:1,
wherein an amount of the first additive is 0.5 wt % to 5 wt % based on a total weight of the electrolyte,
wherein an amount of the second additive is 0.5 wt % to 7 wt % based on total weight of the electrolyte, and
wherein an amount of the fluoroethylene carbonate is 0.1 wt % to 3 wt % based on a total weight of the electrolyte.
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