1 Answer
Secondary batteries are rechargeable because they undergo reversible chemical reactions during discharge and charging cycles.
Here’s a simple breakdown of how it works:
The key factor here is that the chemical changes in secondary batteries can be reversed. This is different from primary batteries (like regular disposable ones), where the chemical reactions are irreversible, and once the battery is drained, it cannot be recharged.
Common examples of secondary batteries include lithium-ion (Li-ion) batteries, nickel-metal hydride (NiMH) batteries, and lead-acid batteries. These rechargeable batteries are used in devices like smartphones, laptops, and electric vehicles.
Here’s a simple breakdown of how it works:
- Discharge (Using the battery): When a secondary battery is used to power a device, a chemical reaction happens inside the battery. This reaction releases energy in the form of electrical power.
- Recharge (Restoring the battery): When you plug the battery into a charger, an electric current is applied in the opposite direction. This causes the chemical reaction to reverse, restoring the original chemicals inside the battery. The battery essentially "refills" its energy, allowing it to be used again.
The key factor here is that the chemical changes in secondary batteries can be reversed. This is different from primary batteries (like regular disposable ones), where the chemical reactions are irreversible, and once the battery is drained, it cannot be recharged.
Common examples of secondary batteries include lithium-ion (Li-ion) batteries, nickel-metal hydride (NiMH) batteries, and lead-acid batteries. These rechargeable batteries are used in devices like smartphones, laptops, and electric vehicles.