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Comparison Of Ordinary Lithium Ion Batteries And Lithium Polymer Batteries

Views: 263     Author: Site Editor     Publish Time: 2023-03-24      Origin: Site


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Comparison Of Ordinary Lithium Ion Batteries And Lithium Polymer Batteries

Ordinary lithium-ion battery
Lithium-ion battery, commonly known as "lithium battery", is the battery system with the best comprehensive performance. The negative electrode of lithium ion battery is carbon material, such as graphite. The positive electrode is a transition metal oxide containing lithium, such as LiMn2O4.

(1) Advantages of lithium-ion batteries:

① High working voltage, the working voltage of lithium-ion battery is 3.7V, which is three times of the working voltage of nickel-cadmium and nickel-metal hydride batteries.

② High specific 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-metal hydride batteries.

③ Long cycle life. The cycle life of lithium-ion batteries has reached more than 1,000 times, and can reach tens of thousands of times at low discharge depths, surpassing other secondary batteries.

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

⑤ No memory effect. It can be recharged as often as required without degrading battery performance.

⑥ No pollution to the environment. There are no harmful substances in lithium-ion batteries, and they are veritable "green batteries".

lithium polymer battery
Lithium polymer batteries are a newer 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.

Polymer electrolyte materials are ordinary thin films composed of a solution in which a host polymer such as polyethylene oxide acts as an immobile 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 case to keep the electrolyte from leaking. Their performance is better, and the capacity of the lithium polymer battery in an ideal state reaches several thousand mA?h, and it is safer. The solid electrolyte is like a sealing gel, which will not easily ignite and disintegrate during charging.

Comparison of Two Batteries
Both Li-polymer battery and Li-ion battery technologies can replace Ni-Gd batteries. But the price is too high, and the market has not fully accepted it, especially lithium polymer technology. Lithium polymer batteries have a larger capacity than lithium batteries under the same volume, and have no memory effect at all (lithium ion batteries still have memory effects, but they are relatively small). Lithium polymer batteries are actually a gel-like substance that is easy to make into various shapes. And it does not contain harmful heavy metal elements, it is a "green battery".

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