Electrolyte for rechargeable lithium battery and rechargeable lithium battery
An electrolyte for a rechargeable lithium battery includes a non-aqueous organic solvent; a lithium salt; a first compound represented by Chemical Formula 1; and a second compound represented by Chemical Formula 2, wherein an amount of the first compound is about 0.05 wt % to about 10 wt % and an amount of the second compound is about 0.05 wt % to about 10 wt %. In Chemical Formulae 1 and 2, the substituents are the same as defined in the detailed description.
1. An electrolyte for a rechargeable lithium battery comprising
a non-aqueous organic solvent;
a lithium salt;
a first compound, wherein the first compound is hexanetricyanide, pentatricyanide, fluorohexanetricyanide or a combination thereof; and
a second compound, wherein the second compound is γ-butyrolactone, γ-caprolactone, γ-valerolactone, fluoro γ-butyrolactone, or a combination thereof,
wherein an amount of the first compound is about 0.05 wt % to about 10 wt % based on 100 wt % of the electrolyte for the rechargeable lithium battery and
an amount of the second compound is about 0.05 wt % to about 10 wt % based on 100 wt % of the electrolyte for the rechargeable lithium battery.
2. The electrolyte for a rechargeable lithium battery of claim 1 , wherein an amount of the first compound is about 0.5 wt % to about 5 wt % based on 100 wt % of the electrolyte for a rechargeable lithium battery.
3. The electrolyte for a rechargeable lithium battery of claim 1 , wherein an amount of the second compound is about 0.5 wt % to about 5 wt % based on 100 wt % of the electrolyte for a rechargeable lithium battery.
4. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the electrolyte comprises at least one additive selected from fluoroethylene carbonate, vinylethylene carbonate, succinonitrile, polysulfone, and a combination thereof.
5. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the electrolyte is used in a battery operated at a high voltage of greater than or equal to about 4.35 V.
6. A rechargeable lithium battery comprising
a negative electrode including a negative active material,
a positive electrode including a positive active material;
and an electrolyte comprising:
a non-aqueous organic solvent;
a lithium salt;
a first compound, wherein the first compound is hexanetricyanide, pentatricyanide, fluorohexanetricyanide or a combination thereof; and
a second compound, wherein the second compound is γ-butyrolactone, γ-caprolactone, γ-valerolactone, fluoro γ-butyrolactone, or a combination thereof,
wherein an amount of the first compound is about 0.05 wt % to about 10 wt % based on 100 wt % of the electrolyte for the rechargeable lithium battery and
an amount of the second compound is about 0.05 wt % to about 10 wt % based on 100 wt % of the electrolyte for the rechargeable lithium battery.
7. The rechargeable battery of claim 6 , wherein an amount of the first compound is about 0.5 wt % to about 5 wt % based on 100 wt % of the electrolyte for a rechargeable lithium battery.
8. The rechargeable battery of claim 6 , wherein an amount of the second compound is about 0.5 wt % to about 5 wt % based on 100 wt % of the electrolyte for a rechargeable lithium battery.
9. The rechargeable battery of claim 6 , wherein the electrolyte comprises at least one additive selected from fluoroethylene carbonate, vinylethylene carbonate, succinonitrile, polysulfone, and a combination thereof.