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

Patent metadata

Field	Value
Publication number	US-12362389-B2
Application number	US-202217813470-A
Country	US
Kind code	B2
Filing date	Jul 19, 2022
Priority date	Dec 29, 2021
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

The present disclosure provides an electrolyte for a lithium secondary battery capable of improving the lifespan characteristics and output characteristics of a high capacity lithium secondary battery and a lithium secondary battery including the same. The electrolyte for a lithium secondary battery, according to an embodiment of the present disclosure, is an electrolyte for a lithium secondary battery including a lithium salt, a solvent, and a functional additive agent, in which the functional additive agent includes a cathode film additive agent, (4-allyl-2-methoxyphenoxy) trimethylsilane, represented by the following formula:

First claim

What is claimed is:

1. An electrolyte solution for a lithium secondary battery, the electrolyte solution comprising an electrolyte comprising a lithium salt, a solvent, and a functional additive agent, wherein the functional additive agent comprises a cathode film additive agent in an amount of 0.1% to 1.0% by weight with respect to a weight of the electrolyte, the cathode film additive agent is (4-allyl-2-methoxyphenoxy)trimethylsilane represented by the following formula:

2. The electrolyte solution of claim 1 , wherein the cathode film additive agent is contained in an amount of 0.1% to 0.5% by weight with respect to a weight of the electrolyte.

3. The electrolyte solution of claim 1 , wherein the lithium salt is one or a mixture of two or more 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 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 , Li(SO 2 F) 2 N(LiFSI), and (CF 3 SO 2 ) 2 NLi.

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

5. The electrolyte solution of claim 4 , wherein the carbonate-based solvent is a material of ethylene carbonate (EC), ethyl methyl carbonate (EMC), or diethyl carbonate (DEC).

6. The electrolyte solution of claim 1 , wherein the functional additive agent further comprises vinylene carbonate (VC) as an anode film additive agent, wherein the vinylene carbonate (VC) is added in an amount of 0.5% to 3.0% by weight with respect to a weight of the electrolyte.

7. The electrolyte solution of claim 1 , wherein the functional additive agent further comprises LiPO 2 F 2 as an anode film additive agent, wherein the LiPO 2 F 2 is added in an amount of 0.1% to 2.0% by weight with respect to a weight of the electrolyte.

8. A lithium secondary battery comprising a cathode, an anode, and an electrolyte solution comprising an electrolyte comprising a lithium salt, a solvent, and a functional additive agent, wherein the functional additive agent comprises a cathode film additive agent in an amount of 0.1% to 1.0% by weight with respect to a weight of the electrolyte, the cathode film additive agent is (4-allyl-2-methoxyphenoxy)trimethylsilane represented by the following formula:

9. The lithium secondary battery of claim 8 , wherein:
the cathode comprises a cathode active material comprising lithium, nickel, manganese, and cobalt oxide;
the anode comprises an anode active material comprising carbon-based materials or silicon-based materials; and
a separator interposed between the cathode and the anode.

10. The lithium secondary battery of claim 9 , wherein the cathode active material comprises 80% by weight or more of nickel (Ni).

11. The lithium secondary battery of claim 9 , wherein the anode active material is graphite.

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
• Choi Nam Soon
• Hong Sung You
• Kwak Sang Kyu
• Moon Hyeon Gyu
• Kim Hyeong Jun
• Jeon Min Ho

Classifications

• H01M2300/004

  Three solvents · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title