Gel polymer electrolyte composition attaining shortened crosslinking time, secondary battery comprising same, and manufacturing method for secondary battery

Patent metadata

Field	Value
Publication number	US-11967680-B2
Application number	US-202318286747-A
Country	US
Kind code	B2
Filing date	Jan 11, 2023
Priority date	Mar 31, 2022
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A gel polymer electrolyte composition, a secondary battery including the same, and a manufacturing method of a secondary battery are disclosed. Advantages of the disclosed aspects include increasing process efficiency by reducing the curing time of a gel polymer electrolyte while preventing leakage of an electrolyte.

First claim

The invention claimed is:

1. A gel polymer electrolyte composition, comprising:
an oligomer represented by Formula 1 below;
a curing accelerator that includes a monocyclic or a polycyclic amine compound;
a polymerization initiator;
a non-aqueous solvent; and
a lithium salt:

in the Formula 1,
R is an alkylene having 1 to 5 carbons substituted with an alkyl group having 1 to 5 carbons, 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 of 100 parts by weight of the gel polymer electrolyte composition.

4. The gel polymer electrolyte composition of claim 1 , wherein the curing accelerator comprises one or more among a pyrimidine-based curing accelerator, an imidazole-based curing accelerator, a purine-based curing accelerator, a thiadiazole-based curing accelerator, and a pyrrole-based curing accelerator.

5. The gel polymer electrolyte composition of claim 4 , wherein
the pyrimidine-based curing accelerator includes one or more of the following formulas 1-a to 1-g:

6. The gel polymer electrolyte composition of claim 4 , wherein the imidazole-based curing accelerator includes one or more of the following formulas 2-a to 2-i:

7. The gel polymer electrolyte composition of claim 4 , wherein the purine-based curing accelerator includes a purine-based curing accelerator represented by the following formula 3-a:

8. The gel polymer electrolyte composition of claim 4 , wherein the thiadiazole-based curing accelerator includes one or more of the following formulas 4-a to 4-b:

9. The gel polymer electrolyte composition of claim 4 , wherein the pyrrole-based curing accelerator includes one or more of the following formulas 5-a to 5-c:

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

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

12. The manufacturing method of lithium secondary battery of claim 11 , further comprising:
performing thermal crosslinking in a range of 10 minutes to 50 minutes after the injecting of the gel polymer electrolyte composition into the battery case.

13. The manufacturing method of lithium secondary battery of claim 12 , wherein the thermal crosslinking is performed in a temperature range of 55 to 80° C.

14. 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;
a battery case accommodating and sealing the electrode assembly; and
the gel polymer electrolyte composition according to claim 1 in the battery case.

15. The lithium secondary battery of claim 14 , wherein the lithium secondary battery is a pouch-type battery.

Assignees

• Lg Energy Solution Ltd

Inventors

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

Classifications

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• C07C69/96

  Esters of carbonic or haloformic acids · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/058

  Construction or manufacture · CPC title