The intercalation and deintercalation of the Li-ions happen due to the redox reactions happening at the electrode-electrolyte interface. During the charging cycle, the positive electrode undergoes oxidation and releases electrons to the external circuit while the negative electrode undergoes reduction by accepting the released electrons. During the discharging cycle, the negative electrode undergoes oxidation releasing electrons while the positive electrode undergoes reduction by accepting the released electrons. It can be thus noted that both the electrodes undergo oxidation and reduction depending upon the charging or the discharging cycle.