Liquid electrolyte, and rechargeable lithium battery including the same

Patent metadata

Field	Value
Publication number	US-2025046869-A1
Application number	US-202418734916-A
Country	US
Kind code	A1
Filing date	Jun 5, 2024
Priority date	Aug 1, 2023
Publication date	Feb 6, 2025
Grant date	—

Abstract

A liquid electrolyte includes: a lithium salt; a non-aqueous organic solvent; and an additive, wherein the additive comprises a polymer represented by Chemical Formula 1:

in Chemical Formula 1,

R 1 to R 3 are each independently hydrogen, fluorine, or a substituted or unsubstituted C1 to C10 alkyl group, and n and m are mole fractions, respectively, 50 mol %≤n≤90 mol %, 10 mol %≤m≤50 mol %.

First claim

What is claimed is:

1 . A liquid electrolyte, comprising:
a lithium salt; a non-aqueous organic solvent; and an additive, wherein the additive comprises a polymer represented by Chemical Formula 1:

in Chemical Formula 1,
R 1 to R 3 are each independently hydrogen, fluorine, or a substituted or unsubstituted C1 to C10 alkyl group, and
n and m are mole fractions, respectively, 50 mol %≤n≤90 mol %, 10 mol %≤m≤50 mol %.

2 . The liquid electrolyte as claimed in claim 1 , wherein
a ratio of n and m (n:m) are about 80 mol %:about 20 mol % to about 60 mol %:about 40 mol %.

3 . The liquid electrolyte as claimed in claim 1 , wherein
a molecular weight of the polymer is about 100,000 g/mol to about 400,000 g/mol.

4 . The liquid electrolyte as claimed in claim 1 , wherein
the polymer is in a form of particles having an average particle diameter of about 10 nm to about 1 μm.

5 . The liquid electrolyte as claimed in claim 1 , wherein
R 1 to R 3 in Chemical Formula 1 are each independently hydrogen, or a substituted or unsubstituted C1 to C5 alkyl group.

6 . The liquid electrolyte as claimed in claim 1 , wherein
the polymer is poly(vinylidene fluoride-co-trifluoroethylene).

7 . The liquid electrolyte as claimed in claim 1 , wherein
the polymer is to be gelled at a temperature of about 100° C. to about 120° C.

8 . The liquid electrolyte as claimed in claim 1 , wherein
the polymer is in an amount of about 0.1 to about 15 parts by weight based on a total of 100 parts by weight of the liquid electrolyte.

9 . The liquid electrolyte as claimed in claim 1 , wherein
the non-aqueous organic solvent comprises cyclic carbonate and chain carbonate in a volume ratio of about 10:90 vol % to about 50:50 vol %.

10 . The liquid electrolyte as claimed in claim 1 , wherein
the liquid electrolyte further comprises at least one other additive selected from among vinylene carbonate (VC), fluoroethylene carbonate (FEC), difluoroethylene carbonate, chloroethylene carbonate, dichloroethylene carbonate, bromoethylene carbonate, dibromoethylene carbonate, nitroethylene carbonate, cyanoethylene carbonate, vinylethylene carbonate (VEC), adiponitrile (AN), succinonitrile (SN), 1,3,6-hexane tricyanide (HTCN), propenesultone (PST), propanesultone (PS), lithium tetrafluoroborate (LiBF 4 ), lithium difluorophosphate (LiPO 2 F 2 ), and 2-fluoro biphenyl (2-FBP).

11 . A rechargeable lithium battery comprising:
a positive electrode comprising a positive electrode active material; a negative electrode comprising a negative electrode active material; and the liquid electrolyte as claimed in claim 1 .

Assignees

• Samsung Sdi Co Ltd
• Ulsan Nat Inst Science & Tech Unist

Inventors

• Woo Myungheui
• Park Hyejin
• Kim Sanghoon
• Yu Arum
• Choi Nam-Soon

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0566

  Liquid materials · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title