US 12,406,993 B2
Dry electrode composition for secondary battery, method for manufacturing dry electrode sheet, dry electrode sheet, electrode, and secondary battery
Young Jun Kim, Daejeon (KR); Yong Hee Kang, Daejeon (KR); and Dong Hoon Lee, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on May 22, 2023, as Appl. No. 18/321,389.
Claims priority of application No. 10-2022-0062785 (KR), filed on May 23, 2022.
Prior Publication US 2023/0378469 A1, Nov. 23, 2023
Int. Cl. H01M 4/04 (2006.01); H01M 4/139 (2010.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/623 (2013.01) [H01M 4/0435 (2013.01); H01M 4/0471 (2013.01); H01M 2004/021 (2013.01)] 7 Claims
OG exemplary drawing
 
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/mm2, 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 CnH2n+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 mm2/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.