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

Patent metadata

Field	Value
Publication number	US-11728514-B2
Application number	US-202017011203-A
Country	US
Kind code	B2
Filing date	Sep 3, 2020
Priority date	Sep 18, 2019
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

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

wherein, in Chemical Formula 1, R 1 to R 6 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.

First claim

What is claimed is:

1. An additive represented by Chemical Formula 1:

wherein, in Chemical Formula 1, R 1 to R 6 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.

2. The additive as claimed in claim 1 , wherein R 1 to R 6 of Chemical Formula 1 are each independently a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, or a substituted or unsubstituted C2 to C10 alkenyl group.

3. The additive as claimed in claim 1 , wherein R 1 to R 3 of Chemical Formula 1 are each independently a substituted or unsubstituted C1 to C10 alkyl group.

4. The additive as claimed in claim 1 , wherein R 4 to R 6 of Chemical Formula 1 are each independently a substituted or unsubstituted C1 to C10 alkyl group.

5. The additive as claimed in claim 1 , wherein R 1 to R 6 of Chemical Formula 1 are each independently a substituted or unsubstituted C1 to C5 alkyl group.

6. 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 .

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

8. The electrolyte as claimed in claim 6 , wherein the additive is included in an amount of about 0.2 wt % to about 2.0 wt %, based on a total weight of the electrolyte.

9. 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 6 .

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

11. The rechargeable lithium battery as claimed in claim 9 , wherein:
the positive active material is represented by Chemical Formula 2:
Li a M 1 1−y1−z 1M 2 y1 M 3 z 1O 2   [Chemical Formula 2]

in Chemical Formula 2,
a, y1, and z1 satisfy the following relations: 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.

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

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/505

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