Electrolyte for lithium secondary battery and lithium-secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11557792-B2
Application number	US-201816644766-A
Country	US
Kind code	B2
Filing date	Sep 21, 2018
Priority date	Sep 21, 2017
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Yang Seung Yoon
• Koh Dongwook
• Yang Doo Kyung

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title