Alkynyl-containing compound additive for non-aqueous electrolyte solution, and non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery which include the same
The present invention relates to an additive for a non-aqueous electrolyte solution, which may suppress the generation of metallic foreign matter causing a side effect in a battery while forming a stable film on the surface of an electrode, a non-aqueous electrolyte solution for a lithium secondary battery which includes the additive, and a lithium secondary battery including the non-aqueous electrolyte solution.
1. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
an organic solvent; and
an additive for a non-aqueous electrolyte solution, wherein the additive comprises at least one compound represented by Formulae 1 or 2:
wherein, in Formula 1 or 2,
R 1 and R 2 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, or alkoxy having 1 to 6 carbon atoms,
R 3 is an alkylene group having 1 to 3 carbon atoms,
R 4 is hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 18 carbon atoms, a heterocycloalkyl group having 5 to 8 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or an alkynyl group having 2 to 4 carbon atoms, wherein the alkyl group, the aryl group, the heterocycloalkyl group, the alkenyl group and the alkynyl group are not further substituted,
R 5 is an alkyl group having 2 to 4 carbon atoms which includes an ether group,
R 6 is hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 18 carbon atoms, a heterocycloalkyl group having 5 to 8 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or an alkynyl group having 2 to 4 carbon atoms, and
n is an integer of 0 to 3,
wherein when R 4 is H or an aryl group having 6 carbon atoms, and n is 0, R 1 is not hydrogen, and
wherein when R 6 is an alkyl group having 1 to 6 carbon atoms, the alkyl group is not further substituted; and when R 6 is an aryl group having 6 to 18 carbon atoms, the aryl group is a phenyl group, a halophenyl group, a tolyl group, a naphthyl group, a trihalophenyl group, a trihalomethylphenyl group, an anthryl group, or a phenanthryl group, each of which is not further substituted.
2. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein in Formula 1,
R 1 is hydrogen or an alkyl group having 1 to 6 carbon atoms,
R 2 is hydrogen or alkoxy having 1 to 6 carbon atoms,
R 3 is an alkylene group having 1 to 3 carbon atoms,
R 4 is an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 18 carbon atoms, a heterocycloalkyl group having 5 to 8 carbon atoms, or an alkynyl group having 2 to 4 carbon atoms, each of which is not further substituted, and
n is an integer of 0 to 3.
3. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein in Formula 2,
R 5 is an alkyl group having 2 to 4 carbon atoms which includes an ether group, and R 6 is an alkyl group having 1 to 6 carbon atoms.
4. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein the additive for a non-aqueous electrolyte solution is included in an amount of 0.01 wt% to 10 wt% based on a total weight of the non-aqueous electrolyte solution.
5. The non-aqueous electrolyte solution for a lithium secondary battery of claim 4 , wherein the additive for a non-aqueous electrolyte solution is included in an amount of 0.5 wt% to 10 wt% based on the total weight of the non-aqueous electrolyte solution.
6. A lithium secondary battery comprising a negative electrode, a positive electrode, and a non-aqueous electrolyte solution,
wherein the non-aqueous electrolyte solution comprises the non-aqueous electrolyte solution for a lithium secondary battery of claim 1 .
7. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
an organic solvent; and
an additive for a non-aqueous electrolyte solution, wherein the additive comprises at least one compound represented by Formulae 1a to 1f:
8. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
an organic solvent; and
an additive for a non-aqueous electrolyte solution, wherein the additive comprises at least one compound represented by Formulae 2e or 2f: