US 12,255,307 B2
Fabrication method of negative electrode for secondary battery and secondary battery including negative electrode
Byoung Wook Jo, Daejeon (KR); Byung Chan Kang, Daejeon (KR); Yong Hee Kang, Daejeon (KR); Sung Jun Park, Daejeon (KR); and Hyo Sung Lim, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Aug. 4, 2021, as Appl. No. 17/393,475.
Claims priority of application No. 10-2020-0097901 (KR), filed on Aug. 5, 2020.
Prior Publication US 2022/0045313 A1, Feb. 10, 2022
Int. Cl. H01M 4/133 (2010.01); H01M 4/04 (2006.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/0471 (2013.01) [H01M 4/0404 (2013.01); H01M 4/133 (2013.01); H01M 4/622 (2013.01); H01M 4/625 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); Y02E 60/10 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A fabrication method of a negative electrode for a secondary battery, comprising:
(a) heating a slurry composition for a negative electrode containing a negative electrode active material, a binder, and a solvent to a temperature lower than a boiling point (Tb) of the solvent,
wherein a viscosity (A1) of the slurry composition for a negative electrode before being heated is 20,000 to 70,000 cP;
(b) applying the heated slurry composition for a negative electrode onto a current collector;
(c) cooling the applied slurry composition for a negative electrode, wherein the cooling is performed at a temperature of 10° C. to 30° C. for 5 to 10 seconds; and
(d) drying the cooled slurry composition for a negative electrode, wherein the drying is performed at a temperature of 95° C. or more and less than 130° C. for 50 to 130 seconds, and
wherein a solid in the slurry composition for the negative electrode is contained in an amount of more than 55 parts by weight and 85 parts by weight or less based on 100 parts by weight of the slurry composition for the negative electrode,
wherein a temperature (T) of the heating of the slurry composition for a negative electrode satisfies the following Relational Equation 1:
0.3Tb<T<0.9Tb  [Relational Equation 1]
wherein Tb is the boiling point of the solvent
wherein the solvent is water.