Rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-2025046870-A1
Application number	US-202418739198-A
Country	US
Kind code	A1
Filing date	Jun 10, 2024
Priority date	Jul 27, 2023
Publication date	Feb 6, 2025
Grant date	—

Abstract

A rechargeable lithium battery including a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, and an electrolyte is provided. An active mass density of the negative electrode is greater than or equal to about 1.7 g/cc, and the electrolyte includes a lithium salt, a non-aqueous organic solvent, a first additive represented by Chemical Formula 1, and a second additive represented by Chemical Formula 2.

First claim

What is claimed is:

1 . A rechargeable lithium battery comprising:
a positive electrode comprising a positive electrode active material; a negative electrode comprising a negative electrode active material; and an electrolyte, wherein an active mass density of the negative electrode is greater than or equal to about 1.7 gram per cubic centimeter (g/cc), and the electrolyte comprises:
a lithium salt;
a non-aqueous organic solvent;
a first additive represented by Chemical Formula 1; and
a second additive represented by Chemical Formula 2:
R 1 —O—R 2   Chemical Formula 1

in Chemical Formula 1, R 1 and R 2 are each independently a fluorine atom or a C1 to C10 fluoroalkyl group;

in Chemical Formula 2,
R 3 and R 4 are each independently a fluorine atom or a C1 to C10 fluoroalkyl group.

2 . The rechargeable lithium battery as claimed in claim 1 , wherein
the first additive is represented by Chemical Formula 1-1:

in Chemical Formula 1-1,
R 11 to R 15 are each a hydrogen atom or a fluorine atom, and at least one selected from among R 11 to R 15 is a fluorine atom; and
R 21 to R 27 are each a hydrogen atom or a fluorine atom, and at least one selected from among R 21 to R 27 is a fluorine atom.

3 . The rechargeable lithium battery as claimed in claim 1 , wherein
the first additive is represented by Chemical Formula 1-1-1:

4 . The rechargeable lithium battery as claimed in claim 1 , wherein
the second additive is represented by Chemical Formula 2-1:

in Chemical Formula 2-1,
R 31 to R 35 are each a hydrogen atom or a fluorine atom, and at least one selected from among R 31 to R 35 is a fluorine atom; and
R 41 to R 47 are each a hydrogen atom or a fluorine atom, and at least one selected from among R 41 to R 47 is a fluorine atom.

5 . The rechargeable lithium battery as claimed in claim 1 , wherein
the second additive is represented by Chemical Formula 2-1-1:

6 . The rechargeable lithium battery as claimed in claim 1 , wherein
the electrolyte comprises the first additive in an amount about 1 to about 20 wt % based on a total amount of the electrolyte.

7 . The rechargeable lithium battery as claimed in claim 1 , wherein
the electrolyte comprises the second additive in an amount about 1 to about 10 wt % based on a total amount of the electrolyte.

8 . The rechargeable lithium battery as claimed in claim 1 , wherein
a weight ratio of the first additive and the second additive is about 20:1 to about 2:1.

9 . The rechargeable lithium battery as claimed in claim 1 , wherein
the non-aqueous organic solvent comprises a carbonate-based solvent and a propionate-based solvent.

10 . The rechargeable lithium battery as claimed in claim 9 , wherein
the non-aqueous organic solvent comprises the propionate-based solvent in an amount greater than or equal to about 70 volume % based on a total amount of the non-aqueous organic solvent.

11 . The rechargeable lithium battery as claimed in claim 1 , wherein
the lithium salt is LiPF 6 .

12 . The rechargeable lithium battery as claimed in claim 1 , wherein
a concentration of the lithium salt is about 0.1 M to about 2.0 M.

13 . The rechargeable lithium battery as claimed in claim 1 , wherein
the positive electrode active material comprises lithium nickel-based oxide, lithium cobalt-based oxide, lithium manganese-based oxide, a lithium iron phosphate-based compound, cobalt-free lithium nickel-manganese-based oxide, or a combination thereof.

14 . The rechargeable lithium battery as claimed in claim 1 , wherein
the negative electrode active material comprises a carbon-based negative electrode active material, a Si-based negative electrode active material, or a combination thereof.

15 . The rechargeable lithium battery as claimed in claim 1 , wherein
the rechargeable lithium battery has an upper charge limit voltage of greater than or equal to about 4.5 V.

16 . The rechargeable lithium battery as claimed in claim 1 , wherein
the active mass density of the negative electrode is about 1.7 g/cc to about 2.0 g/cc.

17 . An electrolyte, the electrolyte comprising:
a lithium salt; a non-aqueous organic solvent; a first additive represented by Chemical Formula 1; and a second additive represented by Chemical Formula 2:
R 1 —O—R 2   Chemical Formula 1

in Chemical Formula 1, R 1 and R 2 are each independently a fluorine atom or a C1 to C10 fluoroalkyl group;

in Chemical Formula 2,
R 3 and R 4 are each independently a fluorine atom or a C1 to C10 fluoroalkyl group,
wherein the electrolyte is for a rechargeable lithium battery.

18 . The electrolyte as claimed in claim 17 , wherein
the electrolyte comprises the first additive in an amount about 1 to about 20 wt % based on a total amount of the electrolyte, and the second additive in an amount about 1 to about 10 wt % based on a total amount of the electrolyte.

19 . The electrolyte as claimed in claim 17 , wherein
a weight ratio of the first additive and the second additive is about 20:1 to about 2:1.

20 . The electrolyte as claimed in claim 17 , wherein
the non-aqueous organic solvent comprises a carbonate-based solvent and a propionate-based solvent.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Sanghyung
• Bae Tae Hyon
• Lee Harim
• Son Seunghyeon
• Shin Youngkyeong
• Kim Sanghoon
• Yu Arum

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title