Additive, electrolyte for rechargeable lithium battery, and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-12015120-B2
Application number	US-202016927116-A
Country	US
Kind code	B2
Filing date	Jul 13, 2020
Priority date	Jul 18, 2019
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

An additive, an electrolyte for a rechargeable lithium battery, and a rechargeable lithium battery, the additive being represented by Chemical Formula 1:

First claim

What is claimed is:

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

wherein, in Chemical Formula 1,
X 1 and X 2 are each independently O, S, CR a R b , or NR c , at least one of X 1 and X 2 being O or S,
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,
R a , R b , R c , and R 2 to R 5 are each independently hydrogen, a substituted or unsubstituted C1 to C5 alkyl group, a substituted or unsubstituted C2 to C5 alkenyl group, or a combination thereof, and
n is an integer selected from 1 to 3.

2. The electrolyte as claimed in claim 1 , wherein the additive is included in the electrolyte in an amount of 0.1 wt % to 10 wt %, based on a total weight of the electrolyte for the rechargeable lithium battery.

3. The electrolyte as claimed in claim 1 , wherein the additive is included in the electrolyte in an amount of 0.1 wt % to 3.0 wt %, based on a total weight of the electrolyte for the rechargeable lithium battery.

4. The electrolyte as claimed in claim 1 , wherein n is 2 or 3.

5. The electrolyte as claimed in claim 1 , wherein at least one of X 1 and X 2 is S.

6. The electrolyte as claimed in claim 1 , wherein 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 C3 to C10 cycloalkyl group, a substituted or unsubstituted C3 to C10 cycloalkenyl group, or a substituted or unsubstituted C6 to C20 aryl group.

7. The electrolyte as claimed in claim 1 , wherein the additive represented by Chemical Formula 1 is represented by Chemical Formula 1A:

wherein, in Chemical Formula 1A, X 1 , X 2 , and R 1 to R 5 are defined the same as those of Chemical Formula 1.

8. The electrolyte as claimed in claim 1 , wherein the additive represented by Chemical Formula 1 is represented by one of Chemical Formula 1-1 to Chemical Formula 1-3:

wherein, in Chemical Formula 1-1 to Chemical Formula 1-3, le to R 5 and n are defined the same as those of Chemical Formula 1.

9. The electrolyte as claimed in claim 1 , wherein R 1 of Chemical Formula 1 is an unsubstituted C1 alkyl group, a substituted or unsubstituted C2 to C10 alkyl group or a substituted or unsubstituted C2 to C5 alkenyl group.

10. A rechargeable lithium battery, comprising:
a positive electrode comprising a positive active material;
a negative electrode comprising a negative active material; and
the electrolyte as claimed in claim 1 .

11. The rechargeable lithium battery as claimed in claim 10 , wherein the positive active material includes a composite oxide including cobalt, manganese, nickel, or a combination thereof, and lithium.

12. The rechargeable lithium battery as claimed in claim 10 , wherein the positive active material is represented by Chemical Formula 2:
Li a M 1 1−y1−z1 M 2 y1 M 3 z1 O 2   [Chemical Formula 2]

wherein, in Chemical Formula 2,
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.

13. The rechargeable lithium battery as claimed in claim 10 , wherein the additive is included in the electrolyte in an amount of 0.1 wt % to 10 wt %, based on a total weight of the electrolyte for the rechargeable lithium battery.

14. The rechargeable lithium battery as claimed in claim 10 , wherein the additive is included in the electrolyte in an amount of 0.1 wt % to 3.0 wt %, based on a total weight of the electrolyte for the rechargeable lithium battery.

Assignees

• Samsung Sdi Co Ltd

Inventors

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

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/028

  Positive electrodes · CPC title