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

Patent metadata

Field	Value
Publication number	US-12519135-B2
Application number	US-202217893856-A
Country	US
Kind code	B2
Filing date	Aug 23, 2022
Priority date	Dec 29, 2021
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

Disclosed is an additive for an electrolyte solution to improve the electrochemical properties of a lithium secondary battery.Especially, an electrolyte solution for a lithium secondary battery include: an electrolyte salt, an organic solvent, and one or more additives comprising a vinylene carbonate (VC) compound having a structure of Formula 1 and 4-allyl-2-methoxyphenyl fluoro sulfate having a structure of Formula 2:

First claim

What is claimed is:

1 . An electrolyte solution for a lithium secondary battery, the electrolyte solution comprising an electrolyte salt, an organic solvent, and additives comprising both:
a vinylene carbonate (VC) compound having a structure of Formula 1 and 4-allyl-2-methoxyphenyl fluoro sulfate having a structure of Formula 2:

2 . The electrolyte solution of claim 1 , wherein the electrolyte solution comprises the 4-allyl-2-methoxyphenyl fluoro sulfate in an amount of about 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 electrolyte solution comprises the VC compound in an amount of about 0.1 to 10% by weight with respect to the total weight of the electrolyte solution.

4 . The electrolyte solution of claim 1 , wherein a ratio of the 4-allyl-2-methoxyphenyl fluoro sulfate and the VC in the electrolyte solution is about 1:2 to 1:10.

5 . The electrolyte solution of claim 1 , wherein the electrolyte salt comprises one 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 a concentration of the electrolyte salt in the electrolyte solution ranges from about 0.5 M to about 1.0 M.

7 . The electrolyte solution of claim 1 , wherein the organic solvent comprises one 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 an 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 present in a ratio of about 6:2:2 to 8:1:1.

11 . A vehicle comprising a lithium secondary battery of claim 8 .

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Unist Ulsan National Insitute Of Science And Tech
• Ulsan Nat Inst Science & Tech Unist

Inventors

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

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title