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

Patent metadata

Field	Value
Publication number	US-12438193-B2
Application number	US-202217988998-A
Country	US
Kind code	B2
Filing date	Nov 17, 2022
Priority date	Jun 10, 2022
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

Disclosed herein are an electrolyte for a lithium secondary battery, which can enhance lifetime and output characteristics in a high-capacity lithium secondary battery, and a lithium secondary battery including the same. The electrolyte for a lithium secondary battery may include a lithium salt, a solvent, and a functional additive, wherein the functional additive includes 5,5-diallyl-3-(tert-butyldimethylsilyl)oxazolidin-2-one as a positive electrode film additive.

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 comprising 5,5-diallyl-3-(tert-butyldimethylsilyl)oxazolidin-2-one represented by the following chemical formula as a positive electrode film additive:

2. The electrolyte of claim 1 , wherein the positive electrode film additive is in a range of 0.1-1.0 wt. %, based on a weight of the electrolyte.

3. The electrolyte of claim 1 , wherein the positive electrode film additive is in a range of 0.3-0.5 wt. %, based on a weight of the electrolyte.

4. The electrolyte of claim 1 , wherein the functional additive further comprises vinylene carbonate (VC) as a negative electrode film additive.

5. The electrolyte of claim 4 , wherein the vinylene carbonate (VC) is in a range of 0.5-3.0 wt. %, based on a weight of the electrolyte.

6. The electrolyte of claim 1 , wherein the lithium salt comprises 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, LiC 4 F 9 SO 3 , LiB(C 6 H 5 ) 4 , LiB(C 2 O 4 ) 2 , LiPO 2 F 2 , Li(SO 2 F) 2 N, (LiFSI), (CF 3 SO 2 ) 2 NLi, or a combination thereof.

7. The electrolyte of claim 1 , wherein the solvent comprises a carbonate-based solvent, an ester-based solvent, an ether-based solvent, a ketone-based solvent, or a combination thereof.

8. A lithium secondary battery comprising:
an electrolyte having a lithium salt, a solvent, and a functional additive, wherein the functional additive comprises 5,5-diallyl-3-(tert-butyldimethylsilyl)oxazolidin-2-one represented by the following chemical formula as a positive electrode film additive:

9. The lithium secondary battery of claim 8 , further comprising:
a positive electrode containing a positive electrode active material comprising Ni, Co, and Mn;
a negative electrode containing at least one negative electrode active material comprising a carbon (C)-based material, a silicon (Si)-based material, or a combination thereof; and
a separator interposed between the positive electrode and the negative electrode.

10. The lithium secondary battery of claim 9 , wherein the positive electrode comprises 80 wt. % or more of Ni.

Assignees

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

Inventors

• Lee Yoon Sung
• Rhee Jun Ki
• Nam Hui Beom
• Kim Ko Eun
• Ban Sung Ho
• Kwak Sang Kyu
• Choi Nam Soon
• Hong Sung You
• Kim Hyeong Jun
• Jeong Seo Young
• Moon Hyeon Gyu
• Kim Min Pyeong

Classifications

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title