Composition, and solid electrolyte and lithium secondary battery using the same

Patent metadata

Field	Value
Publication number	US-2024347768-A1
Application number	US-202218015409-A
Country	US
Kind code	A1
Filing date	Jan 26, 2022
Priority date	Feb 4, 2021
Publication date	Oct 17, 2024
Grant date	—

Abstract

The present invention relates to a composition for preparing a solid electrolyte including a polyrotaxane compound, a cross-linking agent, a lithium salt, and an organic solvent, wherein the cross-linking agent includes a compound represented by Formula 1 below and a compound represented by Formula 2, a method for preparing a solid electrolyte for a lithium secondary battery including thermal-curing the composition for preparing a solid electrolyte, a solid electrolyte for a lithium secondary battery including a thermo-cured product of the composition for preparing a solid electrolyte, and a lithium secondary battery including the solid electrolyte.

First claim

1 . A composition for preparing a solid electrolyte, comprising:
a polyrotaxane compound, a cross-linking agent, a lithium salt, and an organic solvent, wherein the cross-linking agent includes a compound represented by Formula 1 below and a compound represented by Formula 2 below:

wherein in Formula 1 above,
L1 is a C1 to C10 alkylene group, and

wherein in Formula 2 above,
L2 is a C1 to C5 alkylene group.

2 . The composition of claim 1 , wherein the polyrotaxane compound comprises 10 to 90 α-cyclodextrin molecules.

3 . The composition of claim 1 , wherein the weight average molecular weight of the polyrotaxane compound is 10,000 g/mol to 100,000 g/mol.

4 . The composition of claim 1 , wherein the content of the polyrotaxane compound is 5 wt % 20 wt % based on the total weight of the composition for preparing a solid electrolyte.

5 . The composition of claim 1 , wherein the weight ratio of the compound represented by Formula 1 above and the compound represented by Formula 2 above is 1:1 to 10:1.

6 . The composition of claim 1 , wherein the content of the cross-linking agent is 0.5 wt % 5 wt % based on the total weight of the composition for preparing a solid electrolyte.

7 . The composition of claim 1 , wherein the lithium salt is one or more selected from LiNO 3 and LiClO 4 .

8 . The composition of claim 1 , wherein the concentration of lithium salt in the composition for preparing a solid electrolyte is 0.05 M to 3.0 M.

9 . The composition of claim 1 , further comprising one or more polymers selected from the group consisting of polyethylene oxide, polyvinylidene fluoride, and cellulose.

10 . A method for preparing a solid electrolyte for a lithium secondary battery comprising thermal-curing the composition for preparing a solid electrolyte of claim 1 .

11 . The method of claim 10 , wherein the thermal-curing is performed at a temperature of 50° C. to 90° C.

12 . A solid electrolyte for a lithium secondary battery comprising a thermo-cured product of the composition for preparing a solid electrolyte of claim 1 .

13 . A lithium secondary battery comprising:
a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material; and the solid electrolyte for a lithium secondary battery of claim 12 interposed between the positive electrode and the negative electrode.

Assignees

• Lg Energy Solution Ltd
• Univ Korea Res & Bus Found

Inventors

• Kang Sung Joong
• Hah Hoe Jin
• Seo Ji Hun
• Kim Dong Wan
• Seo Ji Ae
• Lee Gwang Hee

Classifications

• H01M2300/0082

  Organic polymers · CPC title

• H01M10/0525

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

• C08L5/16 Primary

  Cyclodextrin; Derivatives thereof · CPC title

• C08J5/20

  Manufacture of shaped structures of ion-exchange resins · CPC title

• C08G83/007

  Polyrotaxanes; Polycatenanes · CPC title