"lithium secondary battery positive electrode material including caffeine organic material and method for producing same"

Patent metadata

Field	Value
Publication number	US-2025023047-A1
Application number	US-202418764819-A
Country	US
Kind code	A1
Filing date	Jul 5, 2024
Priority date	Jul 11, 2023
Publication date	Jan 16, 2025
Grant date	—

Abstract

An embodiment of the disclosure provides a positive electrode material for a lithium secondary battery and a method for producing the same, which uses a caffeine organic material as the positive electrode material of the lithium secondary battery.

First claim

What is claimed is:

1 . A positive electrode material for a lithium secondary battery, which has an amorphous thin film structure comprising a caffeine organic material, and is characterized by exhibiting reversible energy capacity through a reversible reaction in which lithium ions form and dissociate C6—O—Li and N3—Li—C8 bonds with the caffeine organic material.

2 . The positive electrode material for a lithium secondary battery of claim 1 , wherein the amorphous thin film structure has a thickness of 30 μm to 36 μm.

3 . A lithium secondary battery comprising: a positive electrode; a negative electrode; and an ion exchange membrane positioned between the positive electrode and the negative electrode, wherein the positive electrode comprises the positive electrode material for a lithium secondary battery of claim 1 .

4 . A method for producing a positive electrode material for a lithium secondary battery, characterized by comprising:
forming a slurry by mixing a caffeine organic material, a conductive material, and a polymer binder with a solvent; coating the formed slurry on a substrate; drying the substrate coated with the slurry in a vacuum to form a film; and forming a thin film by pressing the formed film.

5 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein the forming of the slurry comprises:
ball-milling a mixture comprising the caffeine organic material and the conductive material to make the mixture amorphous; and mixing the amorphous mixture with the polymer binder and the solvent.

6 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein the ball-milling of the mixture to make the mixture amorphous is performed for 30 to 60 minutes at 200 to 400 rpm.

7 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein the conductive material is at least one selected from the group consisting of Super P, Carbon black, CNT, and Ketjen Black.

8 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein the polymer binder is at least one selected from PVDF and PAA.

9 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein the solvent is N-methylpyrrolidone.

10 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein in the forming of the slurry, the mixing ratio of the caffeine organic material, conductive material, and polymer binder corresponds to a weight ratio of 3:6:1 to 6:3:1.

11 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein in the coating, the substrate is aluminum foil.

12 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein the drying in a vacuum to form the film is performed for 10 to 15 hours at a temperature range of 60° C. to 80° C.

13 . The method for producing a positive electrode material for a lithium secondary battery of claim 4 , wherein in the forming of the thin film by pressing, the thickness of the thin film is 30 μm to 36 μm.

Assignees

• Research & Business Found Sungkyunkwan Univ

Inventors

• Lee Wontae
• Yoon Won Sub
• Kong Sung Ho
• Choi Mun Hyeok

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/622

  being polymers · CPC title