GeePower® Lithium-ion Battery Knowledge Column
What is a lithium polymer battery?
A typical battery has three elements: a positive electrode, a negative electrode, and an electrolyte. A lithium polymer battery refers to a battery system in which at least one of the three elements is made of a polymer material.
In lithium polymer battery systems, most of the polymer materials are used on the positive electrode and the electrolyte. Generally, the positive electrode material uses a conductive polymer or an inorganic compound. The negative electrode is often a lithium metal or a lithium compound, and the electrolyte is a solid or colloidal polymer electrolyte. Since there is no excess electrolyte in the lithium polymer, it is more reliable and stable.
What are the advantages?
In terms of appearance: since polymer materials have high strength, high toughness and high elasticity, the polymer battery can be made into in any shape. The battery also can be bent and deformed. The lithium polymer battery can be bent up to about 90 degrees. Because the electrolyte is solid or colloidal rather than liquid.
About safety: Most of the current lithium polymer batteries are soft-packed batteries, or pouch batteries. It has an outer shell made of aluminum plastic film. The inside is made of an organic electrolyte. So that even if the temperature is too high, it does not explode, but expand or naturally break. Because the battery does not contain liquid electrolyte inside, there will be no battery leakage. Moreover, the capacity of lithium polymer battery will be much higher than the same size of normal lithium-ion battery.
As for cell voltage: The nominal capacity of the lithium battery cell is 3.6V, 3.2V and so on. If high voltage is required, multiple cells can be connected in series to form an ideal high voltage working platform.