Electrolyte for lithium secondary battery, and lithium secondary battery comprising same
An electrolyte solution for a lithium secondary battery, including a first solvent comprising a heterocyclic compound having at least one double bond, and any one of an oxygen atom and a sulfur atom; a second solvent including at least one of an ether-containing compound, an ester-containing compound, an amide-containing compound, and a carbonate-containing compound; a lithium salt; lanthanum nitrate; and an additive including lithium nitrate.
1. An electrolyte solution for a lithium secondary battery, comprising:
a first solvent comprising 2-methylfuran;
a second solvent comprising dimethoxyethane;
a lithium salt comprising LiFSI((SO 2 F) 2 NLi);
lanthanum nitrate;
and an additive comprising lithium nitrate,
wherein the electrolyte solution for the lithium secondary battery does not contain LiTFSI ((CF 3 SO 2 ) 2 NLi),
wherein the electrolyte solution for the lithium secondary battery does not contain 1,3-dioxolane (DOL),
wherein a total content of the additive and lanthanum nitrate is 2% to 8% by weight relative to a total weight of the electrolyte solution for the lithium secondary battery,
and wherein a content ratio of the additive and lanthanum nitrate is 1 to 4:4 to 1 as a weight ratio.
2. The electrolyte solution for the lithium secondary battery according to claim 1 ,
wherein the additive further comprises at least one selected from the group consisting of potassium nitrate, cesium nitrate, magnesium nitrate, barium nitrate, lithium nitrite, potassium nitrite and cesium nitrite.
3. A lithium secondary battery, comprising:
a positive electrode;
a negative electrode;
a separator interposed between the positive electrode and the negative electrode; and
the electrolyte solution for the lithium secondary battery of claim 1 .
4. The lithium secondary battery according to claim 3 , wherein the lithium secondary battery is a lithium-sulfur battery.