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Lithium-ion batteries, commonly known as "lithium batteries", are the current comprehensive performance ** battery system. The negative electrode of a lithium ion battery is a carbon material such as graphite. The positive electrode is a lithium-containing transition metal oxide such as LiMn2O4.
(1) Advantages of lithium ion battery:
1 The working voltage is high, and the working voltage of the lithium ion battery is 3.6V, which is three times the working voltage of the nickel cadmium and nickel hydrogen battery.
2 is higher than energy. The specific energy of lithium-ion batteries has reached 140Wh/kg, which is three times that of nickel-cadmium batteries and 1.5 times that of nickel-hydrogen batteries.
3 cycle life is long. At present, the lithium-ion battery has a cycle life of more than 1000 times, and can reach tens of thousands of times at a low discharge depth, exceeding several other secondary batteries.
4 self-discharge is small. The monthly self-discharge rate of lithium-ion batteries is only 6-8%, which is much lower than that of nickel-cadmium batteries (25-30%) and nickel-hydrogen batteries (30-40%).
5 no memory effect. It can be charged as needed without reducing battery performance.
6 no pollution to the environment. There is no harmful substance in the lithium ion battery, which is a veritable "green battery".
2, lithium polymer battery
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 rather than a liquid electrolyte. The polymer electrolyte material is a common film composed of a solution in which a host polymer such as polyethylene is used as a non-moving solvent. The advantage of a lithium polymer battery is that it can be made into any shape and relatively light because it does not contain heavy metals and has a plastic shell that keeps the electrolyte from leaking out. Their performance is good, ideal lithium polymer battery capacity of several thousand mA / h, and more secure. The solid electrolyte acts like a sealed gel that does not easily disintegrate naturally during charging.
3. Comparison of two batteries
Lithium polymer batteries and lithium ion battery technology can replace Ni-Gd batteries. But the price is too high, the market has not yet fully accepted, especially lithium polymer technology. Darnell Group's analyst, Brush, believes that polymer batteries are not always more expensive than lithium-ion batteries, and current production is indeed much more expensive, which has driven the development of lithium-ion battery technology. The cost of a lithium-ion battery used in laptops was $41.42, and the cost of a polymer battery for laptops was $60.80. Lithium polymer batteries have a larger capacity than lithium batteries in the same volume, and have no memory effect at all (lithium ion batteries still have a memory effect, but are relatively small). Lithium polymer batteries are actually a gel-like substance that is easy to make into various shapes. It does not contain harmful heavy metal elements and is a "green battery".
What is the difference between a lithium polymer battery and a lithium battery?
1, ordinary lithium-ion battery