METHOD FOR PRELITHIATING SOFT CARBON NEGATIVE ELECTRODE AND ASYMMETRIC LITHIUM-ION SUPERCAPACITOR

A method for prelithiating a soft carbon negative electrode (11) includes the steps of: disposing a lithium-containing electrolyte between the soft carbon negative electrode (11) and a lithium metal piece (12); prelithiating the soft carbon negative electrode (11) at a first constant C-rate until a voltage thereof is reduced to a first predetermined voltage not greater than 0.3 V vs. Li/Li, the first constant C-rate being not greater than 5 C; prelithiating the soft carbon negative electrode (11) at a second constant C-rate until the voltage thereof is reduced to a second predetermined voltage 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 prelithiating the soft carbon negative electrode (11) at a prelithiation constant voltage which is not greater than the second predetermined voltage, thereby completing prelithiation of the soft carbon negative electrode (11).