Electrolyte solution for lithium secondary battery and lithium secondary battery including same

Patent metadata

Field	Value
Publication number	US-12322756-B2
Application number	US-202217870046-A
Country	US
Kind code	B2
Filing date	Jul 21, 2022
Priority date	Dec 29, 2021
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

An additive for an electrolyte solution improves the electrochemical properties of a lithium secondary battery.

First claim

The invention claimed is:

1. An electrolyte solution for a lithium secondary battery, the electrolyte solution comprising:
an electrolyte salt; and
an organic solvent;
wherein the electrolyte solution further comprises, as additives, vinylene carbonate (VC) represented by Formula 1:

and 4-(allyloxy)phenyl fluoro sulfate represented by Formula 2:

2. The electrolyte solution of claim 1 , wherein the 4-(allyloxy)phenyl fluoro sulfate comprises 0.1 to 1.0% by weight with respect to the total weight of the electrolyte solution.

3. The electrolyte solution of claim 1 , wherein the VC comprises 0.1 to 10% by weight with respect to the total weight of the electrolyte solution.

4. The electrolyte solution of claim 1 , wherein the 4-(allyloxy)phenyl fluoro sulfate and the VC are added in a ratio of 1:2.

5. The electrolyte solution of claim 1 , wherein the electrolyte salt is any one compound or a mixture of two or more compounds selected from the group consisting of: LiPF 6 , LiBF 4 , LiClO 4 , LiCl, LiBr, LiI, LiB 10 Cl 10 , LiCF 3 SO 3 , LiCF 3.0 CO 2 , Li(CF 3 SO 2 ) 3.0 C, LiAsF 6 , LiSbF 6 , LiAlCl 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(SO 2.0 C 2 F 5 ) 2 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiB(C 6 H 5 ) 4 , and Li(SO 2 F) 2 N(LiFSI).

6. The electrolyte solution of claim 1 , wherein the electrolyte salt is comprised in a concentration range of 0.5 M to 1.0 M.

7. The electrolyte solution of claim 1 , wherein the organic solvent is any one or a mixture of two or more solvents selected from the group consisting of: a carbonate-based solvent, an ester-based solvent, an ether-based solvent, and a ketone-based solvent.

8. A lithium secondary battery comprising a cathode, an anode, a separator interposed between the cathode and the anode, and the electrolyte solution of claim 1 .

9. The lithium secondary battery of claim 8 , wherein the cathode comprises a nickel-cobalt-manganese-based cathode active material.

10. The lithium secondary battery of claim 9 , wherein in the cathode active material, nickel, cobalt, and manganese are contained in a ratio of 6:2:2 to 8:1:1.

Assignees

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

Inventors

• Lee Yoon Sung
• Rhee Jun Ki
• Kim Ko Eun
• Ban Sung Ho
• Oh Seung Min
• Hong Sung You
• Kwak Sang Kyu
• Choi Nam Soon
• Kim Hyeong Jun
• Nam Hui Beom
• Jeon Min Ho

Classifications

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M4/505

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

• H01M2300/004

  Three solvents · CPC title

• C07C309/87

  containing singly-bound oxygen atoms bound to the carbon skeleton · CPC title