The direction of movement of lithium ions when charging a lithium-ion battery is: from the positive electrode to the negative electrode.
A lithium-ion battery is a secondary battery (rechargeable battery) that relies primarily on the movement of lithium ions between positive and negative electrodes to function.
The charging and discharging process of lithium-ion batteries is the process of intercalation and deintercalation of lithium ions. When the battery is charged, lithium ions are generated on the positive electrode of the battery and the generated lithium ions move to the negative electrode via the electrolyte. Likewise, when the battery is discharged, the lithium ions embedded in the carbon layer of the negative electrode are released and return to the positive electrode.