Electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

Patent metadata

Field	Value
Publication number	US-2025158119-A1
Application number	US-202418766280-A
Country	US
Kind code	A1
Filing date	Jul 8, 2024
Priority date	Nov 9, 2023
Publication date	May 15, 2025
Grant date	—

Abstract

An electrolyte for a rechargeable lithium battery includes a non-aqueous organic solvent, a lithium salt, and a salt additive including a sulfonyl group substituted with a perhalogenated alkyl group and a cyano group. In addition, a rechargeable lithium battery including the electrolyte is also disclosed.

First claim

What is claimed is:

1 . An electrolyte comprising:
a non-aqueous organic solvent; a lithium salt; and a salt additive comprising a sulfonyl group substituted with a perhalogenated alkyl group and a cyano group, wherein the electrolyte is for a rechargeable lithium battery.

2 . The electrolyte as claimed in claim 1 , wherein the salt additive is represented by Chemical Formula 1,

in Chemical Formula 1,
M + being a univalent cation,
n being an integer between 1 and 5, and
X being a halogen element.

3 . The electrolyte as claimed in claim 2 , wherein the M + of Chemical Formula 1 is one selected from among Li + , Na + , and K + .

4 . The electrolyte as claimed in claim 1 , wherein the salt additive is represented by Chemical Formula 1-1 or Chemical Formula 1-2,

5 . The electrolyte as claimed in claim 1 , wherein the salt additive has an amount of about 0.02 wt % to about 2 wt % relative to a total weight of the electrolyte.

6 . The electrolyte as claimed in claim 1 , wherein the non-aqueous organic solvent comprises at least one selected from among ethylene carbonate, propylene carbonate, propyl propionate, ethylmethyl carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, methylethyl carbonate, and butylene carbonate.

7 . The electrolyte as claimed in claim 1 , wherein the lithium salt comprises at least one selected from among LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiClO 4 , LiAlO 2 , LiAlCl 4 , LiPO 2 F 2 , LiCl, LiI, LiN(SO 3 C 2 F 5 ) 2 , Li(FSO 2 ) 2 N, lithium bis(fluorosulfonyl)imide, and LiC 4 F 9 SO 3 .

8 . The electrolyte as claimed in claim 1 , wherein a concentration of the lithium salt is in a range of 0.1 M to 2.0 M.

9 . A rechargeable lithium battery, comprising:
a positive electrode that comprises a positive electrode active material; a negative electrode that comprises a negative electrode active material; and the electrolyte as claimed in claim 1 .

10 . The rechargeable lithium battery as claimed in claim 9 , wherein the positive electrode active material comprises one or more selected from among a lithium cobalt-based oxide, a lithium nickel-based oxide, a lithium manganese-based oxide, a lithium iron phosphate-based compounds, a cobalt-free nickel-manganese-based oxide, and a combination thereof.

11 . The rechargeable lithium battery as claimed in claim 9 , wherein the negative electrode active material comprises a carbon-based negative electrode active material, a silicon-based negative electrode active material, or a combination thereof.

Assignees

• Samsung Sdi Co Ltd

Inventors

• TSAY Olga
• Son Seunghyeon
• Kim Sanghoon
• Bae Tae Hyon
• Lee Harim
• Shin Youngkyeong
• Kim Sanghyung

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/583

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

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title