Additive, electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

Patent metadata

Field	Value
Publication number	US-11600861-B2
Application number	US-202016904773-A
Country	US
Kind code	B2
Filing date	Jun 18, 2020
Priority date	Jun 20, 2019
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

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 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 and R 2 are each independently 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 3 to R 6 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 additive 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 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 and R 2 are each independently 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 a , R b , R c , and R 3 to R 6 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.

3. The additive as claimed in claim 1 , 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,
R 1 and R 2 are each independently 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 3 to R 6 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.

4. The additive as claimed in claim 1 , wherein R 1 and R 2 of Chemical Formula 1 are each independently a substituted or unsubstituted C1 to C10 alkyl group or a substituted or unsubstituted C1 to C5 alkenyl group.

5. An electrolyte for a rechargeable lithium battery, the electrolyte comprising:
a non-aqueous organic solvent,
a lithium salt, and
the additive as claimed in claim 1 .

6. The electrolyte as claimed in claim 5 , wherein the additive is included in the electrolyte in an amount of about 0.1 wt % to about 10 wt %, based on a total weight of the electrolyte.

7. The electrolyte as claimed in claim 5 , wherein the additive is included in the electrolyte in an amount of about 0.1 wt % to about 3.0 wt %, based on a total weight of the electrolyte.

8. A rechargeable lithium battery, comprising:
a positive electrode including a positive active material;
a negative electrode including a negative active material; and
the electrolyte as claimed in claim 5 .

9. The rechargeable lithium battery as claimed in claim 8 , wherein the positive active material includes a composite oxide including cobalt, manganese, nickel, or a combination thereof, and lithium.

10. The rechargeable lithium battery as claimed in claim 8 , 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 independently Ni, Co, Mn, Al, Sr, Mg, La, or a combination thereof.

Assignees

• Samsung Sdi Co Ltd

Inventors

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

Classifications

• C07F9/6578

  having phosphorus and sulfur atoms with or without oxygen atoms, as ring hetero atoms · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2004/028

  Positive electrodes · CPC title