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How does a lithium-ion battery work?
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Quick answer
A lithium-ion battery works by shuttling lithium ions between two electrodes through a liquid electrolyte. Discharging sends ions one way and pushes electrons through your device; charging forces them back, storing energy for next time. It has two electrodes — a graphite anode and a metal-oxide cathode — separated by an electrolyte.
Step by step
- It has two electrodes — a graphite anode and a metal-oxide cathode — separated by an electrolyte.
- Discharging: lithium ions move to the cathode while electrons flow out through the circuit, powering the device.
- Charging: an external supply pushes the ions and electrons back to the anode.
- It's rechargeable for hundreds to thousands of cycles before capacity fades.
- High energy density makes it ideal for phones, laptops, and electric cars.
People also ask
Why do lithium-ion batteries degrade over time?
Repeated charging slowly forms unwanted deposits and side reactions that trap lithium and shrink usable capacity.
Why can lithium batteries catch fire?
Damage, defects, or overheating can cause an internal short and 'thermal runaway,' where heat triggers more heat — good design and protection circuits prevent this.
Should you fully drain a lithium-ion battery?
No. Unlike older batteries, they last longer with frequent partial charges and dislike being run to empty.
Part of the guide: Energy & Electricity at Home →