Composition for gel polymer electrolyte, and gel polymer electrolyte and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11658339-B2
Application number	US-201816638714-A
Country	US
Kind code	B2
Filing date	Nov 28, 2018
Priority date	Nov 28, 2017
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

The present invention provides a composition for a gel polymer electrolyte, including an oligomer represented by Formula 1; a polymerization initiator; a non-aqueous solvent; and a lithium salt, and a gel polymer electrolyte and a lithium secondary battery including the same.

First claim

The invention claimed is:

1. A composition for a gel polymer electrolyte, comprising:
an oligomer represented by the following Formula 1;
a polymerization initiator;
a non-aqueous solvent; and
a lithium salt:

wherein in Formula 1,
A is a unit comprising a polycarbonate group,
B and B′ are each independently a unit comprising an amide group,
C and C′ are each independently a unit comprising a (meth)acrylate group, and
m is an integer of 1 to 200;
wherein the unit A is a unit represented by the following Formula A-1 or A-2:

wherein in Formulae A-1 and A-2, R 1 , R 2 and R 3 are each independently a substituted or unsubstituted alkylene group of 1 to 10 carbon atoms, n is an integer of 5 to 3000, and o is 2.

2. The composition according to claim 1 , wherein the composition further comprises a monomer containing at least one functional group selected from the group consisting of an acrylate group, a vinyl group, an epoxy group, an amino group, an amide group, an imide group, a hydroxyl group, a methylol group and a carboxyl group.

3. The composition according to claim 1 , wherein the units B and B′ each independently comprise a unit represented by the following Formula B-1:

wherein in Formula B-1,
R′ is at least one selected from the group consisting of a substituted or unsubstituted alkylene group of 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group of 3 to 10 carbon atoms, a substituted or unsubstituted bicycloalkylene group of 6 to 20 carbon atoms, a substituted or unsubstituted arylene group of 6 to 20 carbon atoms, a unit represented by the following Formula R′-1, and a unit represented by the following Formula R′-2:

4. The composition according to claim 3 , wherein R′ comprises at least one selected from the units represented by the following Formulae R′-3 to R′-8:

5. The composition according to claim 3 , wherein in Formula B-1, R′ is a substituted or unsubstituted alkylene group of 1 to 10 carbon atoms.

6. The composition according to claim 3 , wherein in Formula B-1, R′ is a substituted or unsubstituted cycloalkylene group of 3 to 10 carbon atoms.

7. The composition according to claim 3 , wherein in Formula B-1, R′ is a substituted or unsubstituted bicycloalkylene group of 6 to 20 carbon atoms.

8. The composition according to claim 3 , wherein in Formula B-1, R′ is a substituted or unsubstituted arylene group of 6 to 20 carbon atoms.

9. The composition according to claim 3 , wherein in Formula B-1, R′ is a unit represented by the Formula R′-1

10. The composition according to claim 3 , wherein in Formula B-1, R′ is a unit represented by the following Formula R′-2:

11. The composition according to claim 1 , wherein C and C′ are each independently selected from the units represented by the following Formulae C-1 to C-5:

12. The composition according to claim 1 , wherein the oligomer is a compound selected from the group consisting of the compounds represented by the following Formulae 1-1 and 1-2:

wherein in Formulae 1-1 and 1-2,
C and C′ are each independently a unit comprising a (meth)acrylate group,
R 1 , R 2 and R 3 are each independently a substituted or unsubstituted alkylene group of 1 to 10 carbon atoms,
R′ is at least one selected from the group consisting of a substituted or unsubstituted alkylene group of 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group of 3 to 10 carbon atoms, a substituted or unsubstituted bicycloalkylene group of 6 to 20 carbon atoms, a substituted or unsubstituted arylene group of 6 to 20 carbon atoms, a unit represented by the following Formula R′-1, and a unit represented by the following Formula R′-2, and
m is an integer of 1 to 200, n is an integer of 5 to 3000, and o is 2.

13. The composition according to claim 1 , wherein the oligomer is a compound represented by the following Formula 1-3:

wherein in Formula 1-3, m is an integer of 1 to 200, and n is an integer of 5 to 3000.

14. The composition according to claim 1 , wherein the composition for a gel polymer electrolyte further comprises a compound selected from the group consisting of a compound represented by the following Formula 2-1, a compound represented by the following Formula 2-2, and the derivatives thereof:

wherein in Formulae 2-1 and 2-2,
R 4 to R 7 are the same or different and are each independently hydrogen, halogen, a substituted or unsubstituted, linear or nonlinear alkyl group of 1 to 10 carbon atoms, a substituted or unsubstituted alkoxy group of 1 to 10 carbon atoms, or a substituted or unsubstituted alkenyl group of 2 to 10 carbon atoms.

15. A gel polymer electrolyte prepared using the composition for a gel polymer electrolyte according to claim 1 .

16. A lithium secondary battery comprising:
a positive electrode;
a negative electrode;
a separator disposed between the positive electrode and the negative electrode; and

the gel polymer electrolyte according to claim 15 .

17. The composition according to claim 1 , wherein the unit A is the unit represented by Formula A-1:

wherein in Formula A-1, R 2 and R 3 are each independently a substituted or unsubstituted alkylene group of 1 to 10 carbon atoms, n is an integer of 5 to 3000, and o is 2.

18. The composition according to claim 1 , wherein the unit A is the unit represented by Formula A-2:

wherein in Formula A-2, R 1 , R 2 and R 3 are each independently a substituted or unsubstituted alkylene group of 1 to 10 carbon atoms, n is an integer of 5 to 3000, and o is 2.

Assignees

• Lg Chern Ltd
• Lg Energy Solution Ltd

Inventors

• Ahn Kyoung Ho
• Lee Jung Hoon
• Lee Jae Won
• Lee Chui Haeng

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M10/0565 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title