Dry electrode composition for secondary battery, method for manufacturing dry electrode sheet, dry electrode sheet, electrode, and secondary battery

Patent metadata

Field	Value
Publication number	US-12406993-B2
Application number	US-202318321389-A
Country	US
Kind code	B2
Filing date	May 22, 2023
Priority date	May 23, 2022
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

A dry electrode composition including: an electrode active material; a particulate binder in which fibers aggregate to form bundles; and a plasticizer, wherein the binder is fiberizable by heat and pressure, a method for manufacturing a dry electrode sheet for a secondary battery using the dry electrode composition, and an electrode and a secondary battery including the dry electrode sheet are provided.

First claim

What is claimed is:

1. A method for manufacturing an electrode sheet, the method comprising: calendering an electrode composition, thereby manufacturing the electrode sheet,
wherein the electrode composition comprises an electrode active material, a binder in which fibers aggregate to form bundles, and a plasticizer,
wherein the binder is fiberizable by heat or pressure and has a tensile strength of 20 to 50 N/mm 2 , an elongation of 350 to 550%, and a specific gravity of 2.0 to 2.5 g/cc,
wherein the plasticizer includes a liquid paraffin having a chemical formula of C n H 2n+2 , wherein n is 19 or more, having a boiling point of 115 to 150° C., an evaporation rate of 0.1 to 200, a density of 0.723 to 0.785 g/cc as measured at 15.6° C., and a viscosity of 0.80 to 3.85 mm 2 /s as measured at 25° C.,
wherein the plasticizer is comprised at a content of 10 to 30 parts by weight with respect to 100 parts by weight of the binder,
wherein the calendering is performed while heating to a boiling point of the plasticizer to evaporate the plasticizer; and
wherein no further heating is performed after calendering.

2. The method for manufacturing the electrode sheet of claim 1 , wherein the calendering is performed at a temperature of 50 to 150° C.

3. The method for manufacturing the electrode sheet of claim 1 , further comprising: kneading the electrode composition under heating to fiberize the binder.

4. The method for manufacturing the electrode sheet of claim 3 , wherein the kneading is performed by heating to a temperature of 30 to 200° C.

5. The method for manufacturing the electrode sheet of claim 3 , wherein the kneading is performed by applying shear pressure.

6. The method for manufacturing the electrode sheet of claim 3 , wherein the kneading is performed at a rotational speed of 20 to 50 rpm.

7. The method for manufacturing the electrode sheet of claim 3 , wherein the kneading is performed for 1 to 10 minutes.

Assignees

• Sk On Co Ltd

Inventors

• Kim Young Jun
• Kang Yong Hee
• Lee Dong Hoon

Classifications

• H01M4/0435 Primary

  Rolling or calendering · CPC title

• H01M4/0471

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

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

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

• H01M4/139

  Processes of manufacture · CPC title