Electrolyte for lithium secondary battery and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-11830979-B2
Application number	US-202117339328-A
Country	US
Kind code	B2
Filing date	Jun 4, 2021
Priority date	Oct 13, 2020
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

The electrolyte for a lithium secondary battery comprises: a lithium salt; a solvent; and a functional additive, wherein the functional additive comprises naphthalen-1-yl sulfurofluoridate, represented by the following formula 1:

First claim

What is claimed is:

1. An electrolyte for a lithium secondary battery, the electrolyte comprising:
a lithium salt;
a solvent; and
a functional additive,
wherein the functional additive comprises naphthalen-1-yl sulfurofluoridate, represented by the following formula 1:

2. The electrolyte of claim 1 , wherein the naphthalen-1-yl sulfurofluoridate is added in an amount of 0.5-1.0 wt %, based on a total weight of the electrolyte.

3. The electrolyte of claim 1 , wherein the functional additive further comprises lithium difluoro(oxalato)borate, represented by the following formula 2:

4. The electrolyte of claim 3 , wherein the lithium difluoro(oxalato)borate is added in an amount of 0.5-1.0 wt %, based on a total weight of the electrolyte.

5. The electrolyte of claim 1 , wherein the functional additive further comprises vinylene carbonate (VC).

6. The electrolyte of claim 5 , wherein the vinylene carbonate (VC) is added in an amount of 0.5-3.0 wt %, based on a total weight of the electrolyte.

7. The electrolyte of claim 1 , wherein the lithium salt is at least one compound selected from a group consisting of: LiPF 6 , LiBF 4 , LiClO 4 , LiCl, LiBr, LiI, LiB 10 Cl 10 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, LiN(SO 2 C 2 F 5 ) 2 , Li(CF 3 SO 2 ) 2 N, LiCF 4 F 9 SO 3 , LiB(C 6 Hs) 4 , Li(SO 2 F) 2 N(LiFSI), and (CF 3 SO 2 ) 2 NLi.

8. The electrolyte of claim 1 , wherein the solvent is at least one substance selected from a group consisting of: a carbonate-based solvent, an ester-based solvent, an ether-based solvent, and a ketone-based solvent.

9. A lithium secondary battery, comprising an electrolyte comprised of:
a lithium salt;
a solvent; and
a functional additive, wherein the functional additive comprises naphthalen-1-yl sulfurofluoridate, represented by the following formula 1:

10. The lithium secondary battery of claim 9 , further comprising:
a positive electrode containing a positive electrode active material composed of Ni, Co, and Mn;
a negative electrode containing at least one negative electrode active material selected from a carbon (C)-based material and silicon (Si)-based material; and
a separator interposed between the positive electrode and the negative electrode.

11. The lithium secondary battery of claim 10 , wherein the positive electrode contains Ni at a content of 80 wt % or more.

12. The lithium secondary battery of claim 9 , wherein the naphthalen-1-yl sulfurofluoridate is added in an amount of 0.5-1.0 wt %, based on a total weight of the electrolyte.

13. The lithium secondary battery of claim 9 , wherein the functional additive further comprises lithium difluoro(oxalato)borate, represented by the following formula 2:

14. The lithium secondary battery of claim 13 , wherein the lithium difluoro(oxalato)borate is added in an amount of 0.5-1.0 wt %, based on a total weight of the electrolyte.

15. The lithium secondary battery of claim 9 , wherein the functional additive further comprises vinylene carbonate (VC).

16. The lithium secondary battery of claim 15 , wherein the vinylene carbonate (VC) is added in an amount of 0.5-3.0 wt %, based on a total weight of the electrolyte.

17. The lithium secondary battery of claim 9 , wherein the lithium salt is at least one compound selected from a group consisting of: LiPF 6 , LiBF 4 , LiClO 4 , LiCl, LiBr, LiI, LiB 10 Cl 10 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, LiN(SO 2 C 2 F 5 ) 2 , Li(CF 3 SO 2 ) 2 N, LiCF 4 F 9 SO 3 , LiB(C 6 Hs) 4 , Li(SO 2 F) 2 N(LiFSI), and (CF 3 SO 2 ) 2 NLi.

18. The lithium secondary battery of claim 9 , wherein the solvent is at least one substance selected from a group consisting of: a carbonate-based solvent, an ester-based solvent, an ether-based solvent, and a ketone-based solvent.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Ulsan Nat Inst Science & Tech Unist

Inventors

• Lee Yoon Sung
• Kim Ik Kyu
• Oh Seung Min
• Ban Sung Ho
• Park Sang Mok
• Kim Ko Eun
• Kwak Sang Kyu
• Choi Nam Soon
• Moon Hyeon Gyu
• Jeong Seo Young
• Hong Sung You
• Hwang Dae Yeon

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• C07C381/00

  Compounds containing carbon and sulfur and having functional groups not covered by groups C07C301/00 - C07C337/00 · CPC title

• C07F5/04

  Esters of boric acids · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title