Lithium-ion

Lithium-ion batteries are rechargeable power sources that store energy chemically and release it as electricity when needed. They consist of an anode (usually graphite), a cathode (made of a lithium metal oxide), and an electrolyte that allows lithium ions to move between them. During charging, lithium ions move from the cathode to the anode; during use, they flow back to produce an electric current. These batteries are valued for their high energy density, long lifespan, and lightweight design, making them common in smartphones, laptops, electric vehicles, and renewable energy storage systems.