Principles of Lithium Polymer Batteries

Lithium polymer batteries are a new type of secondary battery, which was first introduced by Panasonic in 1996. Compared with common 

lithium-ion batteries, lithium polymer batteries have higher energy density, safer performance, and longer service life.

1. Working principle of lithium polymer batteries

The positive electrode material of lithium polymer batteries usually uses polymer electrolytes, while the negative electrode material is usually 

graphite or silicon. When the battery is discharged, lithium ions migrate from the positive electrode material to the negative electrode material 

and supply external electrical appliances through the circuit; During charging, lithium ions return from the negative electrode material to the 

positive electrode material, storing electrical energy.

2. Classification of lithium polymer batteries

According to different cathode materials, lithium polymer batteries can be divided into two types: polymer cathode lithium-ion batteries and cobalt 

oxide lithium polymer batteries. Among them, polymer positive electrode lithium-ion batteries have higher energy density and lower cost, but are 

slightly inferior to lithium cobalt oxide polymer batteries in terms of performance and safety.

3. Characteristics of lithium polymer batteries

Compared to traditional batteries, lithium polymer batteries have the following characteristics:

High energy density: 

Due to the use of polymer electrolytes and high-capacity cathode materials, the energy density of the battery is significantly increased.

Long service life: 

Lithium polymer batteries have multiple charging cycles and a long lifespan. They can withstand over 3000 cycles of charging and discharging 

at room temperature.

Low self discharge rate: 

Compared to other types of secondary batteries, its self discharge rate is very low, and it can maintain a high charge even when not in use for 

a long time.

Safer: 

Lithium polymer ion batteries will not explode or catch fire when subjected to external shocks or overheating, making them safer compared to 

other batteries.