Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same
A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte solution comprises a lithium salt, an organic solvent containing a carbonate compound and a propionate compound, and an additive containing 1,4-dicyano-2-butene and 1,3,5-cyclohexanetricarbonitrile, wherein a volume ratio of the carbonate compound to the propionate compound is 10:90 to 40:60, and wherein a weight ratio of the 1,4-dicyano-2-butene to the 1,3,5-cyclohexanetricarbonitrile is 1:1.5 to 1:3.7.
1 . A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
an organic solvent containing a carbonate compound and a propionate compound; and
an additive comprising 1,4-dicyano-2-butene and 1,3,5-cyclohexanetricarbonitrile,
wherein a volume ratio of the carbonate compound to the propionate compound is 10:90 to 40:60,
wherein the carbonate compound is at least one selected from ethylene carbonate or propylene carbonate,
wherein the propionate compound is at least one selected from methyl propionate, ethyl propionate, propyl propionate, or butyl propionate,
wherein a weight ratio of the 1,4-dicyano-2-butene to the 1,3,5-cyclohexanetricarbonitrile is 1:1.5 to 1:3.5, and
wherein the 1,4-dicyano-2-butene is present in an amount of 0.1 wt % to 2.5 wt % based on a total weight of the non-aqueous electrolyte solution.
2 . The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein the volume ratio of the carbonate compound to the propionate compound is 20:80 to 40:60.
3 . The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein the weight ratio of the 1,4-dicyano-2-butene to the 1,3,5-cyclohexanetricarbonitrile is 1:1.5 to 1:3.3.
4 . A lithium secondary battery, comprising:
a positive electrode including a positive electrode active material;
a negative electrode including a negative electrode active material;
a separator disposed between the negative electrode and the positive electrode; and
the non-aqueous electrolyte solution of claim 1 .
5 . The lithium secondary battery of claim 4 , wherein the positive electrode active material comprises at least one of lithium-cobalt oxide, lithium-manganese-based oxide, or lithium-nickel-manganese-cobalt-based oxide.
6 . The lithium secondary battery of claim 4 , wherein the positive electrode active material comprises at least one of lithium-cobalt oxide or lithium-nickel-manganese-cobalt-based oxide.
7 . The lithium secondary battery of claim 6 , wherein the lithium-nickel-manganese-cobalt-based oxide comprises at least one of Li(Ni 0.6 Mn 0.2 Co 0.2 )O 2 , Li(Ni 0.7 Mn 0.15 Co 0.15 )O 2 , or Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 .