History #

The development of lithium-polymer (Li-Polymer) batteries began in the late 1970s, when the first commercial Li-Polymer cells were developed by Sanyo. These cells used a solid polymer electrolyte instead of the liquid electrolyte found in traditional lithium-ion (Li-Ion) cells. This allowed for a much thinner and lighter battery design, as well as improved safety features.

Since then, Li-Polymer batteries have become increasingly popular in consumer electronics, such as mobile phones, laptops, and tablets. They are also used in electric vehicles, medical devices, and other applications where size and weight are important considerations.

Typical Use #

Li-Polymer batteries are typically used in applications where size and weight are important considerations. This includes mobile phones, laptops, tablets, and other consumer electronics. They are also used in electric vehicles, medical devices, and other applications where size and weight are important considerations.

Li-Polymer batteries are also used in applications where high energy density is important, such as in electric vehicles and medical devices. They have a higher energy density than traditional Li-Ion batteries, meaning they can store more energy in a smaller package.

Design #

Li-Polymer batteries are typically designed with a solid polymer electrolyte instead of the liquid electrolyte found in traditional Li-Ion cells. This allows for a much thinner and lighter battery design, as well as improved safety features.

The cells are typically composed of a positive electrode (cathode), a negative electrode (anode), and a separator. The separator is a thin, porous material that separates the two electrodes and allows ions to move between them.

The cathode is typically made of lithium cobalt oxide (LiCoO2) or lithium manganese oxide (LiMn2O4). The anode is typically made of graphite. The electrolyte is typically a solid polymer, such as polyethylene oxide (PEO) or polyacrylonitrile (PAN).

Li-Polymer batteries can be designed in a variety of shapes and sizes, depending on the application. They can be designed as thin, flexible sheets, or as rigid blocks. They can also be designed with multiple cells in a single package, allowing for higher energy densities.

Li-Polymer batteries are typically charged using a constant current/constant voltage (CC/CV) charging method. This method allows for a safe and efficient charging process, and helps to prevent overcharging and cell damage.