Dear friend Ekta Singh Shrinet

Lithium-ion batteries have a lower current limit when charging than discharging because of the internal structure of the battery. During discharge, lithium ions move from the negative electrode to the positive electrode. However, during charging, lithium ions cannot all move to the positive electrode. A part of lithium ions must be retained at the negative electrode to ensure that lithium ions can be smoothly inserted into the channel during the next charging. Otherwise, battery life will be shortened (battery charging - Lithium-ion charge cutoff - Electrical.....).

According to Battery University, Li-ion cannot absorb overcharge. When fully charged, the charge current must be cut off. A continuous trickle charge would cause plating of metallic lithium and compromise safety. To minimize stress, keep the lithium-ion battery at the peak cut-off as short as possible (Lithium Ion Battery Charging And Discharging....).

I hope this helps you understand better.

Source:

(1) Lithium Ion Battery Charging And Discharging Tips. https://www.bonnenbatteries.com/lithium-ion-battery-charging-and-discharging-tips/.

(2) battery charging - Lithium-ion charge cutoff - Electrical Engineering .... https://electronics.stackexchange.com/questions/314556/lithium-ion-charge-cutoff.

(3) Accessing the current limits in lithium ion batteries: Analysis of .... https://www.sciencedirect.com/science/article/abs/pii/S0378775321002640.

(4) BU-808: How to Prolong Lithium-based Batteries - Battery University. https://batteryuniversity.com/article/bu-808-how-to-prolong-lithium-based-batteries.

(5) lithium ion - Why is there a maximum charging current much lower than .... https://electronics.stackexchange.com/questions/417493/why-is-there-a-maximum-charging-current-much-lower-than-maximum-discharging-curr.

(6) Understanding Charge-Discharge Curves of Li-ion Cells. https://evreporter.com/understanding-charge-discharge-curves-of-li-ion-cells/.