Electrolyte for lithium secondary battery and lithium-secondary battery including the same
An electrolyte for a lithium-secondary battery including a solvent, a lithium salt and an additive, wherein the additive includes a diamine-based compound, and a lithium-secondary battery including the same.
1. An electrolyte for a lithium-secondary battery comprising:
a solvent;
a lithium salt; and
an additive,
wherein the additive is a diamine-based compound that is an xylylene diamine (XDA).
2. The electrolyte for a lithium-secondary battery of claim 1 , wherein the solvent comprises one or more non-aqueous solvent selected from the group consisting of carbonate-based solvent, ester-based solvent, ether-based solvent, ketone-based solvent, alcohol-based solvent and aprotic solvent.
3. The electrolyte for a lithium-secondary battery of claim 1 , wherein the lithium salt comprises one or more selected from the group consisting of LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiC 4 BO 8 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, (C 2 F 5 SO 2 ) 2 NLi, (SO 2 F) 2 NLi, (CF 3 SO 2 ) 3 CLi, lithium bis(oxalato)borate, lithium-oxalyldifluoroborate, lithium 4,5-dicyano-2-(trifluoromethyl)imidazole, lithium dicyanotriazolate, lithium thiocyanate, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenylborate and lithium imide.
4. The electrolyte for a lithium-secondary battery of claim 1 , wherein the lithium salt is present in a concentration of 0.1 M to 4 M.
5. The electrolyte for a lithium-secondary battery of claim 1 , wherein the additive is present in an amount of 0.01% by weight to 1.0% by weight based on 100% by weight of the electrolyte.
6. The electrolyte for a lithium-secondary battery of claim 1 , wherein the additive is present in an amount of 0.05% by weight to 0.5% by weight based on 100% by weight of the electrolyte.
7. The electrolyte for a lithium-secondary battery of claim 1 , wherein the additive is present in an amount of 0.1% by weight to 0.3% by weight based on 100% by weight of the electrolyte.
8. The electrolyte for a lithium-secondary battery of claim 1 , which does not include a compound having an N—O bond.
9. A lithium-secondary battery comprising:
a positive electrode;
a negative electrode; and
the electrolyte of claim 1 .
10. The lithium-secondary battery of claim 9 , wherein the positive electrode comprises a sulfur compound, and the negative electrode comprises lithium metal or a lithium alloy.
11. An electrolyte for a lithium-secondary battery consisting of:
a solvent;
a lithium salt; and
an additive,
wherein the additive is xylylene diamine (XDA).
12. The electrolyte for a lithium-secondary battery of claim 11 , wherein the solvent comprises one or more non-aqueous solvent selected from the group consisting of carbonate-based solvent, ester-based solvent, ether-based solvent, ketone-based solvent, alcohol-based solvent and aprotic solvent.
13. The electrolyte for a lithium-secondary battery of claim 11 , wherein the lithium salt comprises one or more selected from the group consisting of LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiC 4 BO 8 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, (C 2 F 5 SO 2 ) 2 NLi, (SO 2 F) 2 NLi, (CF 3 SO 2 ) 3 CLi, lithium bis(oxalato)borate, lithium-oxalyldifluoroborate, lithium 4,5-dicyano-2-(trifluoromethyl)imidazole, lithium dicyanotriazolate, lithium thiocyanate, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenylborate and lithium imide.
14. The electrolyte for a lithium-secondary battery of claim 11 , wherein the lithium salt is present in a concentration of 0.1 M to 4 M.
15. The electrolyte for a lithium-secondary battery of claim 11 , wherein the additive is present in an amount of 0.01% by weight to 1.0% by weight based on 100% by weight of the electrolyte.
16. The electrolyte for a lithium-secondary battery of claim 11 , wherein the additive is present in an amount of 0.05% by weight to 0.5% by weight based on 100% by weight of the electrolyte.
17. The electrolyte for a lithium-secondary battery of claim 11 , wherein the additive is present in an amount of 0.1% by weight to 0.3% by weight based on 100% by weight of the electrolyte.
18. The electrolyte for a lithium-secondary battery of claim 11 , which does not include a compound having an N—O bond.
19. A lithium-secondary battery comprising:
a positive electrode;
a negative electrode; and
the electrolyte of claim 11 .
20. The lithium-secondary battery of claim 19 , wherein the positive electrode comprises a sulfur compound, and the negative electrode comprises lithium metal or a lithium alloy.