Electrolyte of rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-2025300227-A1
Application number	US-202218860791-A
Country	US
Kind code	A1
Filing date	Nov 9, 2022
Priority date	May 20, 2022
Publication date	Sep 25, 2025
Grant date	—

Abstract

The present invention relates to an electrolyte of a rechargeable lithium battery and a rechargeable lithium battery including same, and the electrolyte including a non-aqueous organic solvent; a lithium salt; an ionic liquid including a cation and an anion.

First claim

1 . An electrolyte for a rechargeable lithium battery, comprising:
a non-aqueous organic solvent; a lithium salt; an ionic liquid comprising a cation represented by Chemical Formula 1 and an anion represented by Chemical Formula 2; and an additive comprising at least one compounds represented by Chemical Formulas 3 to 6:

wherein R1 to R4 are the same or different, and are a substituted or unsubstituted C1 to C3 alkyl group,
Ra, Rb, Rc, and Rd are the same or different, and are a substituted or unsubstituted C1 to C6 alkylene group;
R5-SO2-N—SO2-R6R5-SO2-N—SO2-R6  [Chemical Formula 2]

wherein R 5 and R 6 are a fluoroalkyl group including at least one F);

(wherein X 1 is a substituted or unsubstituted C1 to C3 alkylene group or (−C2H4-O—C2H4-)n1, and n1 is an integer ranging from 1 to 10;

wherein X2 is a substituted or unsubstituted C1 to C2 alkylene group or or (—C2H4-O—C2H4-)n2, and n2 is an integer ranging from 1 to 10, and
R7 is —CN, —N═C═O, —N═C═S, —OSO2CH3, —OSO2C2H5, —OSO 2 F, or —OSOCF3;

wherein
X3 is a fluoro group, a chloro group, a bromo group, or an iodo group,
R8 to R13 are the same or different, and are hydrogen, a cyano group, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C20 alkynyl group, a substituted or unsubstituted C3 to C20 cycloalkyl group, a substituted or unsubstituted C6 to C20 aryl group or a substituted or unsubstituted C2 to C20 heteroaryl group, and
n3 is an integer of 0 or 1; and

wherein, R14 to R16 are the same or different, and are a substituted or unsubstituted C1 to C10 alkylene group, a substituted or unsubstituted C3 to C30 cycloalkylene group, a substituted or unsubstituted C6 to C30 arylene group, or a substituted or unsubstituted C2 to C30 heteroarylene group.

2 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein an amount of the ionic liquid is 0.05 wt % to 30 wt % based on the total, 100 wt %, of the electrolyte.

3 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein an amount of the additive is 0.05 wt % to 10 wt % based on the total, 100 wt %, of the electrolyte.

4 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein an amount of the additive is 0.05 wt % to 8 wt % based on the total, 100 wt %, of the electrolyte.

5 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein in Chemical Formula 4, R7 is —CN.

6 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein in Chemical Formula 5, X3 is F.

7 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein the compound of Chemical Formula 5 is represented by Chemical Formula 5a or Chemical Formula 5b:

wherein
X3 is a fluoro group, a chloro group, a bromo group, or an iodo group,
R8 to R13 are the same or different, and are hydrogen, a cyano group, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C20 alkynyl group, a substituted or unsubstituted C3 to C20 cycloalkyl group, a substituted or unsubstituted C6 to C20 aryl group, or a substituted or unsubstituted C2 to C20 heteroaryl group.

8 . A rechargeable lithium battery, comprising:
a negative electrode; a positive electrode; and the electrolyte of claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Minseo
• Woo Myungheui
• Kim Sanghoon
• Yu Arum

Classifications

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0525

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

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title