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The difference between lithium polymer battery and ordinary lithium battery

by:dcfpower     2021-03-18

1. Ordinary lithium battery pack

Ordinary lithium ion battery is commonly known as 'lithium batteryThe negative electrode of a lithium ion battery is a carbon material, such as graphite. The positive electrode is a transition metal oxide containing lithium, such as LiMn2O4.

(1) Advantages of lithium-ion batteries:

①High working voltage, the working voltage of lithium-ion batteries is 3.6V, which is nickel-cadmium and nickel Three times the working voltage of a hydrogen battery.

②Higher than energy. The specific energy of lithium-ion batteries has reached 140Wh/kg, which is 3 times that of nickel-cadmium batteries and 1.5 times that of nickel-hydrogen batteries.

③Long cycle life. At present, the cycle life of lithium-ion batteries has reached more than 1,000 times, and it can reach tens of thousands of times at low depths of discharge, which exceeds that of other secondary batteries.

④The self-discharge is small. The monthly self-discharge rate of lithium-ion batteries is only 6-8%, which is far lower than nickel-cadmium batteries (25-30%) and nickel-hydrogen batteries (30-40%).

⑤No memory effect. It can be charged at any time as required without reducing battery performance.

⑥No pollution to the environment. There are no harmful substances in the lithium battery pack, and it is a veritable 'green battery'.

2. Lithium polymer batteries

Lithium polymer batteries are a new generation of batteries that entered the market in large quantities in 1999. Lithium polymer batteries are basically the same as lithium ion batteries except that the electrolyte is a solid polymer instead of a liquid electrolyte. The polymer electrolyte material is an ordinary thin film composed of a melt, in which the main polymer such as polyethylene oxide acts as a non-mobile solvent. The advantage of the lithium polymer battery is that it can be made into any shape and is relatively light, because it does not contain heavy metals and has a plastic shell to keep the electrolyte from leaking. Their performance is good, the ideal state of the lithium polymer battery capacity of several thousand mA/h, and safer. The solid electrolyte is like a sealing gel and will not easily disintegrate naturally during the charging process.

3. Comparison of the two batteries

Lithium polymer battery and lithium ion battery technology can replace Ni-Gd battery. But the price is too high, the market has not yet fully accepted, especially the lithium polymer technology. Darnell Group analyst Brush believes:

Polymer batteries will not always be more expensive than lithium-ion batteries. The current production situation is indeed much more expensive, which promotes the development of lithium-ion battery technology. The cost of lithium-ion batteries used in notebook computers was US$41.42, and the cost of polymer batteries used in notebook computers was US$60.80.

Lithium polymer batteries have a larger capacity than lithium batteries under the same volume, and there is no memory effect at all (lithium ion batteries still have a memory effect, but they are relatively small). Lithium polymer batteries are actually a gel-like substance, which can be easily made into various shapes. And it does not contain harmful heavy metal elements, which is a 'green battery'.


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