Lithium polymer battery, also known as polymer lithium battery, is a battery with chemical properties. Compared with previous batteries, it has the characteristics of high energy, miniaturization and lightweight.

The main difference between them lies in the difference of electrolyte. Liquid electrolyte is used for liquid lithium-ion battery, while solid polymer electrolyte is used for polymer lithium-ion battery. This polymer can be "dry" or "colloidal". At present, polymer gel electrolyte is mostly used.