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

Patent metadata

Field	Value
Publication number	US-12525648-B2
Application number	US-202218002853-A
Country	US
Kind code	B2
Filing date	Apr 6, 2022
Priority date	Apr 12, 2021
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

Provided are an additive represented by Chemical Formula 1, an electrolyte for a rechargeable lithium battery including the same, and a rechargeable lithium battery.The details of Chemical Formula 1 are as set forth in the specification.

First claim

The invention claimed is:

1 . An additive represented by Chemical Formula 1:

wherein in Chemical Formula 1,
X is C(═O) or S(═O) 2 , and
R 1 and R 2 are each independently a fluoro group, or a C1 to C5 fluoroalkyl group substituted with at least one fluoro group.

2 . The additive of claim 1 , wherein
Chemical Formula 1 is represented by one of Chemical Formula 1-1 to Chemical Formula 1-8:

wherein, in Chemical Formula 1-1 to Chemical Formula 1-8,
R a , R b , R c , and R d are each independently hydrogen or a fluoro group, and
n and m are each independently one of integers from 0 or 4.

3 . The additive of claim 1 , wherein
the additive is represented by Chemical Formula 1-1 or Chemical Formula 1-2.

4 . An electrolyte for a rechargeable lithium battery, comprising
a non-aqueous organic solvent, a lithium salt, and the additive of any one of claim 1 to claim 3 .

5 . The electrolyte of claim 4 , wherein
the additive is included in an amount of 0.01 to 5.0 parts by weight based on 100 parts by weight of the electrolyte.

6 . A rechargeable lithium battery comprising
a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material; and the electrolyte of claim 5 .

7 . The rechargeable lithium battery of claim 6 , wherein
the positive electrode active material is represented by Chemical Formula 4:
Li x M 1 y M 2 z M 3 1-y-z O 2-a X a   [Chemical Formula 4]

wherein, in Chemical Formula 4, 0.5≤x≤1.8, 0≤a≤0.05, 0<y≤1, 0≤z≤1, 0≤y+z≤1, M 1 , M 2 , and M 3 each independently include at least one element selected from a metal of Ni, Co, Mn, Al, B, Ba, Ca, Ce, Cr, Fe, Mo, Nb, Si, Sr, Mg, Ti, V, W, Zr, La, and a combination thereof, and X includes at least one element selected from F, S, P, and Cl.

8 . The rechargeable lithium battery of claim 7 , wherein
in Chemical Formula 4, 0.8≤y≤1, 0≤z≤0.2, and M 1 is Ni.

9 . The rechargeable lithium battery of claim 6 , wherein
the negative electrode active material is graphite or includes a Si composite and graphite together.

10 . The rechargeable lithium battery of claim 9 , wherein
the Si composite include a core including Si-based particles and an amorphous carbon coating layer.

11 . The rechargeable lithium battery of claim 10 , wherein
the Si-based particles include one or more of a Si—C composite, SiO x (0<x≤2), and a Si alloy.

12 . The rechargeable lithium battery of claim 11 , wherein
the Si—C composite includes a core including Si particles and crystalline carbon and an amorphous carbon coating layer on a surface of the core, and an average particle diameter of the Si particles is 50 nm to 200 nm.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Sanghyung
• Lee Tae Jin
• Kim Minseo
• Woo Myungheui
• Park Hyejin
• Kim Sanghoon
• Kim Dahyun
• Ryu Bokyung

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title