1. Ordinary lithium ion battery

Lithium ion battery commonly known as "lithium battery", is the current comprehensive performance of the best battery system. The cathode 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 battery:

(1) high working voltage, the working voltage of lithium ion battery in 3.6V, is three times the working voltage of nickel cadmium and nickel metal hydride battery.

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

(3) long cycle life. At present, the cycle life of lithium ion battery has reached more than 1000 times, and it can reach tens of thousands of times at low discharge depth, which is more than other kinds of secondary batteries.

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

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

6 pollution of the environment. Lithium - ion batteries do not exist in harmful substances, worthy of the name of the "green battery."

Lithium polymer batteries

Lithium-polymer batteries are newer generation 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 rather than a liquid electrolyte. A polymer electrolyte material is a common film composed of a solution in which the main polymer such as a polythene compound ACTS as an immobile solvent. The advantage of lithium-polymer batteries is that they can be made of any shape and are relatively light because they contain no heavy metals and have plastic shells that keep electrolytes from leaking out. They all perform well, ideally with a capacity of several thousand mA/h and are safer. The solid electrolyte ACTS like a sealed gel and does not disintegrate easily during charging.

3. Comparison of two kinds of batteries

Lithium polymer battery and lithium ion battery technology can replace the ni-gd battery. But the price is too high for the market to fully accept, especially lithium polymer technology. Polymer batteries won't always be more expensive than lithium-ion batteries, says Brush, an analyst with Darnell group. Previously, lithium-ion batteries for laptops cost $41.42, and polymer batteries for laptops cost $60.80. Lithium polymer batteries have a larger capacity than lithium batteries at the same volume, and there is no memory effect at all (lithium ion batteries do have a memory effect, but only a small one). Lithium polymer batteries are actually gelatinous materials that are easy to make into various shapes. It does not contain harmful heavy metals and is a "green battery".