US 12,437,939 B2
Method for prelithiating soft carbon negative electrode and asymmetric lithium-ion supercapacitor
Yan-Shi Chen, Chiayi (TW); Guo-Hsu Lu, Chiayi (TW); Chi-Chang Hu, Chiayi (TW); Chih-Yu Ku, Chiayi (TW); and Tien-Yu Yi, Chiayi (TW)
Assigned to CPC CORPORATION, TAIWAN, Kaohsiung (TW)
Filed by CPC CORPORATION, TAIWAN, Kaohsiung (TW)
Filed on Jan. 13, 2023, as Appl. No. 18/154,765.
Claims priority of application No. 111143226 (TW), filed on Nov. 11, 2022.
Prior Publication US 2024/0170230 A1, May 23, 2024
Int. Cl. H01G 11/86 (2013.01); H01G 11/06 (2013.01); H01G 11/32 (2013.01); H01G 11/50 (2013.01); C25D 5/54 (2006.01)
CPC H01G 11/86 (2013.01) [H01G 11/06 (2013.01); H01G 11/32 (2013.01); H01G 11/50 (2013.01); C25D 5/54 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for prelithiating a soft carbon negative electrode, comprising the steps of:
a) disposing the soft carbon negative electrode and a lithium metal piece spaced apart from each other such that a lithium-containing electrolyte is present therebetween;
b) prelithiating the soft carbon negative electrode at a first constant C-rate until a voltage of the soft carbon negative electrode is reduced to a first predetermined voltage that is not greater than 0.3 V vs. Li/Li+, the first constant C-rate being not greater than 5 C;
c) after step b), prelithiating the soft carbon negative electrode at a second constant C-rate until the voltage of the soft carbon negative electrode is reduced to a second predetermined voltage that is lower than the first predetermined voltage, the second constant C-rate being not greater than 0.2 C and being less than the first constant C-rate; and
d) after step c), prelithiating the soft carbon negative electrode at a prelithiation constant voltage which is not greater than the second predetermined voltage, thereby completing prelithiation of the soft carbon negative electrode.