What is a lithium-ion battery?
A lithium-ion battery is rechargeable storage in which lithium ions move between electrodes during charge and discharge.
How it works and where it is used
1. How it works Cells contain positive and negative electrodes, electrolyte and separator. Ions move internally while electrons flow through the circuit; chemistries differ. 2. Applications and examples Phones, vehicles and grid storage are uses. Capacity describes stored energy, whereas power describes delivery rate.
Limits and good practice
3. Limitations and security Heat, damage and faulty charging can shorten life or create fire hazards. Safety depends on cell chemistry, pack design and protection electronics. 4. Practical considerations Use suitable chargers, avoid swollen or damaged packs, and follow collection and recycling rules rather than ordinary disposal.