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Definition and characteristics of polymer lithium ion battery


Definition and characteristics of polymer lithium ion battery

Li-polymer battery (Li-polymer), also known as polymer lithium-ion battery, is a chemical battery. Lithium polymer batteries have ultra-thin features, and can be made into batteries of different shapes and capacities to meet the needs of some products. The theoretical minimum thickness can reach 0.5mm.


1. The problem of battery leakage is relatively improved, but it has not been completely improved.

2. It can be made into a thin battery: with a capacity of 3.6V 250mAh, its thickness can be as thin as 0.5mm.

3. The battery can be designed into a variety of shapes.

4. It can be made into a single high voltage: the battery with liquid electrolyte can only obtain high voltage by connecting several batteries in series, while the polymer battery can be made into a multi-layer combination within a single battery to achieve high voltage because there is no liquid.

5. The discharge capacity is theoretically 10% higher than that of a lithium-ion battery of the same size.

Lithium polymer batteries have many advantages such as high specific energy, miniaturization, ultra-thinness, light weight and high safety. Based on these advantages, lithium polymer batteries can be made into batteries of any shape and capacity to meet various requirements. The product needs; and it uses aluminum-plastic packaging, and internal problems can be immediately manifested through the outer packaging. Even if there is a safety hazard, it will not explode, but will only bulge.

In polymer batteries, the electrolyte plays the dual function of a separator and electrolyte: on the one hand, it separates the positive and negative materials like a diaphragm to prevent self-discharge and short circuit inside the battery. On the other hand, it is in the positive and negative like the electrolyte. Conduct lithium ions between the poles. Polymer electrolyte not only has good conductivity, but also has the characteristics of light weight, good elasticity, and easy film formation that are unique to polymer materials. It also conforms to the development trend of light weight, safety, high efficiency, and environmental protection of chemical power sources.

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