Electrolyte for rechargeable lithium battery and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-11908999-B2
Application number	US-202017081062-A
Country	US
Kind code	B2
Filing date	Oct 27, 2020
Priority date	Oct 31, 2019
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

An electrolyte for a rechargeable lithium battery and a rechargeable lithium battery including the electrolyte, the electrolyte including a non-aqueous organic solvent; a lithium salt; and an additive, wherein the additive includes a compound represented by Chemical Formula 1:in Chemical Formula 1, R1 is a cyano group, a substituted or unsubstituted C2 to C10 alkenyl group, or a substituted or unsubstituted C2 to C10 alkynyl group.

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,
wherein:
the additive includes a compound represented by Chemical Formula 1:

in Chemical Formula 1, R 1 is an unsubstituted C2 to C10 alkenyl group or an unsubstituted C2 to C10 alkynyl group, and
the compound represented by Chemical Formula 1 is included in an amount of about 0.2 wt % to about 1.5 wt %, based on a total weight of the electrolyte.

2. The electrolyte as claimed in claim 1 , wherein R 1 an unsubstituted C2 to C4 alkenyl group or an unsubstituted C2 to C4 alkynyl group.

3. The electrolyte as claimed in claim 1 , wherein R 1 is a vinyl group, a propenyl group, an ethynyl group, or a propynyl group.

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

5. 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 1 .

6. The rechargeable lithium battery as claimed in claim 5 , wherein the positive active material includes a composite oxide of lithium and cobalt, manganese, nickel, or a combination thereof.

7. The rechargeable lithium battery as claimed in claim 5 , wherein:
the positive active material is represented by Chemical Formula 4:
Li x1 M 1 1−y1−z 1M 2 y1 M 3 z 1O 2   [Chemical Formula 4]

in Chemical Formula 4,
xl, yl, and zl satisfy the following relations: 0.9≤x1≤1.8, 0≤y1≤1, 0≤z1≤1, and 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.

8. The rechargeable lithium battery as claimed in claim 5 , wherein:
the positive active material is represented by Chemical Formula 5:
Li x2 Ni y2 Co z2 Al 1−y2−z2 O 2   [Chemical Formula 5]

in Chemical Formula 5, x2, y2, and z2 satisfy the following relations: 1≤x2≤1.2, 0.6≤y2≤1, and 0≤z2≤0.5.

9. The rechargeable lithium battery as claimed in claim 5 , wherein the negative active material includes a Si-C composite including a Si active material and a carbon active material.

10. The rechargeable lithium battery as claimed in claim 9 , wherein the negative active material further includes crystalline carbon.

11. The rechargeable lithium battery as claimed in claim 10 , wherein:
the crystalline carbon includes graphite, and
the graphite includes natural graphite, artificial graphite, or a mixture thereof.

12. The rechargeable lithium battery as claimed in claim 9 , wherein
the Si-C composite further includes a shell surrounding a surface of the Si-C composite, and
the shell includes amorphous carbon.

13. The rechargeable lithium battery as claimed in claim 12 , wherein the amorphous carbon includes soft carbon, hard carbon, a mesophase pitch carbonization product, calcined coke, or a mixture thereof.

14. The rechargeable lithium battery as claimed in claim 5 , wherein the compound represented by Chemical Formula 1 is represented by Chemical Formula 1A:

Assignees

• Samsung Sdi Co Ltd
• Postech Res & Business Dev Found
• Postech Acad Ind Found

Inventors

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

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• C07F9/3826

  Acyclic unsaturated acids · CPC title

• C07F9/3886

  Acids containing the structure -C(=X)-P(=X)(XH)2 or NC-P(=X)(XH)2, (X = O, S, Se) · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/366

  as layered products · CPC title