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

Patent metadata

Field	Value
Publication number	US-2022344715-A1
Application number	US-202017762816-A
Country	US
Kind code	A1
Filing date	Sep 9, 2020
Priority date	Oct 7, 2019
Publication date	Oct 27, 2022
Grant date	—

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

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 a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C3 to C10 cycloalkenyl group, or a substituted or unsubstituted C6 to C20 aryl 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 a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C2 to C10 alkenyl group, or a substituted or unsubstituted C6 to C20 aryl 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 a substituted or unsubstituted C1 to C10 alkyl group or a substituted or unsubstituted C2 to C10 alkenyl 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 Ni, Co, Mn, Al, Sr, Mg, La, or 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, and 0≤z≤0.5.

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

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M10/0525

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