| 主权项 |
1. A lithium rechargeable battery, comprising:
an electrode assembly; a case accommodating the electrode assembly; and an electrolyte in the case, wherein the electrolyte includes: a first additive, the first additive including a compound represented by at least one selected from the following Chemical Formulae 1 and 2: wherein, in Chemical Formulae 1 and 2:
A is B or P,X′, Y′, and Z′ are each independently hydrogen or Si(Ra)3, Ra being a C1 to C7 alkyl group, provided that X′, Y′, and Z′ are not all hydrogen, andX″, Y″, and Z″ are each independently hydrogen or Si(Rb)3, Rb being a C1 to C7 alkyl group, provided that X″, Y″, and Z″ are not all hydrogen; a second additive, the second additive including a compound represented by at least one selected from the following Chemical Formulae 3 and 4: wherein, in Chemical Formulae 3 and 4:
Re and Rf are each independently a halogen, a halogen-substituted or unsubstituted C1 to C10 alkyl group, a halogen-substituted or unsubstituted C2 to C10 alkenyl group, or a halogen-substituted or unsubstituted C1 to C10 alkoxy group, andRg, Rh, Ri, and Rj are each independently a halogen, a halogen-substituted or unsubstituted C1 to C10 alkyl group, a halogen-substituted or unsubstituted C2 to C10 alkenyl group, or a halogen-substituted or unsubstituted C1 to C10 alkoxy group, or at least two of Rg, Rh, Ri, and Rj are fused with each other to form an oxalate group; a lithium salt; and a non-aqueous organic solvent, wherein: the first additive is included in the electrolyte in an amount of about 0.1 to about 10 parts by weight, based on 100 parts by weight of the non-aqueous organic solvent, the second additive is included in the electrolyte in an amount of about 0.05 to about 10 parts by weight, based on 100 parts by weight of the non-aqueous organic solvent, and the first additive and the second additive are included in the electrolyte in a weight ratio of about 1:5 to about 3:1, the compound represented by Chemical Formula 1 or 2 includes tris(trimethylsilyl)phosphite, tris(triethylsilyl)phosphite, tris(trimethylsilyl)phosphate, tris(triethylsilyl)phosphate, tris(trimethylsilyl)borate, tris(triethylsilyl)borate, or a mixture thereof, and the compound represented by Chemical Formula 3 or 4 includes lithium oxalyldifluoroborate, lithium difluorobis(oxalato)phosphate, lithium tetrafluoro(oxalato)phosphate, lithium tris(oxalato)phosphate, or a mixture thereof. |
