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Why Don't Lithium-Ion Batteries Charge After They're Full?

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Lithium-ion batteries are newly designed batteries following advanced technology. They contain electrodes having the best combination with lithium-ions along with a separator. Micro-permeable separators separate lithium-ion from their electrons after the battery's discharging on their respective electrodes.

Lithium-ion batteries are different and super-efficient compared to alkaline or other regular batteries. The ability to provide strong energy even after low discharge for an extensive period of the batteries makes them different from the compromised strength of the regular one due to low discharge.

Lithium-ion batteries do not charge after getting fully charged

To understand what happens when lithium-ion batteries stop charging after getting fully charged, first, you have to know about the procedure behind charging lithium-ion batteries.

Charging principle of lithium-ion batteries

Charging lithium-ion batteries involves the following steps.

Breathing of electrodes

The charging principle of lithium-ion batteries at the very first step involves moving electrons to the outside with the flow of current both when charging and discharging the battery and ion move to the other respective electrode.

The charging/discharging will help understand the breathing system of lithium-ion batteries, which is the specially designed part of these kinds of batteries. The breathing of electrodes depends upon the main current supply to the battery.

Passage of ions from the micro permeable separator

Lithium ions are separated from their electrons when current is provided to the battery and aggregate on the cathode, and electrons move outside the battery with the current flow. The battery also recharges itself by the application of reverse current flow.

Plugging in charger

Chargers for lithium-ion batteries are also specifically designed according to advanced technology, so other regular chargers can't charge them. The specified chargers follow the principle of constant current by constant voltage for proper charging.

Inside the battery, many components are involved in charging. Still, outside there is only a single visible component that provides a guide by a high or low voltage to the whole charging procedure.

How does charging stop itself after getting charged?

The unique feature of lithium-ion batteries is it discharges themselves after getting fully charged, even the charger is plugged in.

Charging retention capacity-self discharging

Lithium-ion batteries with the unique design of self-discharging, of course, make them different from other batteries. However, it is very beneficial because it's a kind of measure of the charging retention capacity of the battery.

The process of stopping charging after getting charged is all due to the retention capacity of the lithium-ion batteries.

Procedure

Normally, when lithium-ion batteries are plugged in or into an open circuit, the components of the battery start storing the power consumed simultaneously.  Self-discharging occurs mainly because of the following;

  • Micro short circuit mostly happens when there is overcharging or any current leakage from the battery.
  • The intense temperature will also lead to the self-discharging of the lithium–ion batteries.
  • High voltage stress will also stop charging.

Lithium-ion batteries are advanced and beneficial and do not need to be charged fully; that's why they have a self-discharge function.

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