Lithium-ion battery: is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: during charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge, the opposite is true. Batteries generally use materials containing lithium as electrodes, which are the representatives of modern high-performance batteries.

Lithium-based batteries are divided into lithium batteries and lithium-ion batteries. Mobile phones and laptops use lithium-ion batteries, commonly known as lithium-ion batteries, but real lithium-ion batteries are rarely used in daily electronic products due to their high risk.

Lithium batteries are widely used in energy storage power systems such as water power, fire power, wind power and solar power stations, as well as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace and other fields. At present, lithium batteries have gradually expanded to electric bicycles, electric vehicles and other fields.