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

Patent metadata

Field	Value
Publication number	US-12294055-B2
Application number	US-202017762816-A
Country	US
Kind code	B2
Filing date	Sep 9, 2020
Priority date	Oct 7, 2019
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

Provided is an electrolyte solution for a lithium secondary battery, the electrolyte solution comprising a non-aqueous organic solvent, a lithium salt, and an additive, wherein the additive includes a compound represented by Chemical Formula 1.
The contents of Chemical Formula 1 are the same as described in the specification.

First claim

The invention claimed is:

1. An electrolyte solution for a lithium secondary battery, the electrolyte solution comprising:
a non-aqueous organic solvent,
a lithium salt, and
an additive,
wherein the additive includes a compound represented by Chemical Formula 1:

wherein, in Chemical Formula 1,
R 1 is an unsubstituted C1 to C10 alkyl group and
R 2 to R 4 are each independently hydrogen, a halogen, a substituted or unsubstituted C1 to C5 alkyl group, a substituted or unsubstituted C2 to C5 alkenyl group, or a combination thereof.

2. The electrolyte solution of claim 1 , wherein, in Chemical Formula 1,
R 1 is an unsubstituted C1 to C10 alkyl group, and
R 2 to R 4 are each independently hydrogen, a halogen, a substituted or unsubstituted C1 to C5 alkyl group, or a combination thereof.

3. The electrolyte solution of claim 1 , wherein, in Chemical Formula 1,
R 1 is an unsubstituted C 1 to C 10 alkyl group, and
R 2 to R 4 are each independently hydrogen or a substituted or unsubstituted C1 to C5 alkyl group.

4. The electrolyte solution of claim 1 , wherein the compound represented by Chemical Formula 1 is included in the electrolyte solution in an amount of 0.1 wt % to 10 wt %, based on a total weight of the electrolyte solution for a lithium secondary battery.

5. The electrolyte solution of claim 1 , wherein the compound represented by Chemical Formula 1 is included in the electrolyte solution in an amount of 0.1 wt % to 3.0 wt %, based on a total weight of the electrolyte solution for a lithium secondary battery.

6. The electrolyte solution of claim 1 , wherein:
the non-aqueous organic solvent includes a cyclic carbonate-based solvent and a chain carbonate-based solvent, and
a volume ratio of the cyclic carbonate-based solvent and the chain carbonate-based solvent is in the range of 2:8 to 5:5.

7. A lithium secondary battery, comprising
a positive electrode including a positive active material;
a negative electrode including a negative active material; and
the electrolyte solution of claim 1 .

8. The lithium secondary battery of claim 7 , wherein a surface of the negative electrode further includes a solid electrolyte interface (SEI).

9. The lithium secondary battery of claim 7 , wherein the positive active material is represented by Chemical Formula 4:
Li a M 1 1-y1-z1 M 2 y1 M 3 z1 O 2   [Chemical Formula 4]

wherein, in Chemical Formula 4,
0.9≤a≤1.8, 0≤y1≤1, 0≤z1≤1, 0≤y1+z1<1, and
M 1 , M 2 , and M 3 are each independently any one selected from Ni, Co, Mn, Al, Sr, Mg, La, and a combination thereof.

10. The lithium secondary battery of claim 7 , wherein the positive active material is represented by Chemical Formula 5:
Li x Ni y Co z Al 1-y-z O 2   [Chemical Formula 5]

wherein, in Chemical Formula 5, 1≤x≤1.2, 0.6≤y≤1, 0≤z≤0.5, and 0≤1−y−z.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kang Younghye
• Kim Dongyoung
• Kim Soojin
• Kim Aeran
• Ryu Suyeol
• Shin Jeongmin
• Lee Junyong
• Lee Tae Jin
• Lim Jin-Hyeok
• Jeong Myunghwan
• Cho Wonseok
• Choi Hyunbong
• Han Jungmin

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M10/052 Primary

  Li-accumulators · 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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title