L ithium-ion batteries are the most common type of rechargeable battery used in portable electronic devices, such as laptops, cell phones, and digital cameras. They are also used in electric vehicles and some grid-scale energy storage systems. Lithium-ion batteries work by storing energy in the form of lithium ions. The ions move between the positive and negative electrodes of the battery when it is being charged or discharged. The anode is made of a material that can easily give up lithium ions, such as graphite. The cathode is made of a material that can easily accept lithium ions, such as lithium cobalt oxide. High energy density: Lithium-ion batteries can store more energy per unit mass than other types of batteries, such as lead-acid batteries. This makes them ideal for portable devices that need to be lightweight. Long lifespan: Lithium-ion batteries can last for hundreds of charge cycles, which is much longer than other types of batteries. Fast charging: Lithium-ion batteries