Gel polymer electrolyte composition having reduced crosslinking time, secondary battery comprising same, and method for manufacturing secondary battery

Patent metadata

Field	Value
Publication number	US-2024380006-A1
Application number	US-202318286701-A
Country	US
Kind code	A1
Filing date	Jan 11, 2023
Priority date	Mar 29, 2022
Publication date	Nov 14, 2024
Grant date	—

Abstract

Disclosed herein relates to a gel polymer electrolyte composition, a secondary battery including the same, and a manufacturing method of a secondary battery, and has an advantage of increasing process efficiency by reducing the curing time of a gel polymer electrolyte while preventing leakage of an electrolyte.

First claim

1 . A gel polymer electrolyte composition, comprising:
a reaction additive including phosphate-based compounds; a polymerization initiator; a non-aqueous solvent; a lithium salt; and an oligomer represented by Formula 1:

wherein in the Formula 1,
R is an alkylene having 1 to 5 carbon atoms optionally substituted with an alkyl group having 1 to 5 carbon atoms, and
m is an integer from 1 to 50.

2 . The gel polymer electrolyte composition of claim 1 , wherein the gel polymer electrolyte composition has a curing time in a range of 10 minutes to 50 minutes under heat treatment conditions of 55 to 80° C.

3 . The gel polymer electrolyte composition of claim 1 , wherein a content of the oligomer is in a range of 0.1 to 30 parts by weight based on a total 100 parts by weight of the gel polymer electrolyte composition.

4 . The gel polymer electrolyte composition of claim 1 , wherein at least one of the phosphate-based compounds is represented by Formula 2:

wherein in the Formula 2,
R 1 , R 2 , and R 3 are each independently a hydrogen or an alkylene having 1 to 3 carbon atoms numbers 1 to 3, and
when at least one of R 1 , R 2 , and R 3 is an alkylene having 1 to 3 carbon atoms, R 4 , R 5 , and R 6 are units each independently containing an acrylate group, a methacrylate group, or a vinyl group, respectively.

5 . The gel polymer electrolyte composition of claim 1 , wherein at least one of the phosphate-based compounds is represented by one or more of Formulas a to d:

6 . The gel polymer electrolyte composition of claim 1 , wherein a content of the reaction additive is in a range of 0.01 to 10 parts by weight based on a total 100 parts by weight of the gel polymer electrolyte composition.

7 . A method of manufacturing lithium secondary battery, comprising:
injecting the gel polymer electrolyte composition according to claim 1 into a battery case storing an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode.

8 . The manufacturing method of lithium secondary battery of claim 7 , further comprising:
performing thermal crosslinking in a range of 10 minutes to 50 minutes after injecting the gel polymer electrolyte composition into the battery case.

9 . The method of claim 8 , wherein the performing of the thermal crosslinking is performed in a temperature range of 55 to 80° C.

10 . The method of claim 8 , further comprising:
wetting the electrode assembly including waiting for 1 minute to 30 hours between the injecting of the gel polymer electrolyte composition and the performing of the thermal crosslinking.

11 . The method of claim 8 , further comprising:
any one or more among an activation and a degassing after the performing of the thermal crosslinking.

12 . A lithium secondary battery, comprising:
an electrode assembly comprising a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode; and a battery case including the gel polymer electrolyte composition according to claim 1 , wherein the battery case accommodates and seals the electrode assembly.

13 . The lithium secondary battery of claim 12 , wherein the lithium secondary battery is a pouch-type secondary battery.

Assignees

• Lg Energy Solution Ltd

Inventors

• Shin Won Kyung
• Lee Won Tae
• Oh Young Ho
• Lee Chul Haeng
• Ahn Kyoung Ho

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/0569

  characterised by the solvents · CPC title