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The basic knowledge of Lithium-ion battery's
                             Author:赛斯达                            2009-6-5


Portable electronic devices to the battery as a power supply. With the rapid development of portable products, and increase the battery usage and has developed many new battery. In addition we are familiar with high-performance alkaline batteries, rechargeable nickel cadmium batteries, nickel-hydrogen batteries, there is also the development of lithium batteries in recent years. Here mainly on the basic knowledge of lithium batteries. This includes the characteristics of its main parameters, models of the meaning and scope of application, such as the use of attention.

Lithium is a metal element, the chemical symbol for the Li (in English known as lithium), is a silvery white, very soft, lively and chemical properties of the metal, the metal is the lightest. In addition it applies to atomic energy industry, manufacturing of special alloys, special glass (the TV screen glass used) and lithium batteries. Li-ion battery in it for the battery anode.

Lithium batteries is also divided into two categories: non-rechargeable and rechargeable the two. Non-rechargeable battery known as the disposable batteries, it can only be a one-time chemical energy into electrical energy, electrical energy can not be restored back to chemical energy (or to restore the very poor performance). The rechargeable battery known as the secondary battery (also known as batteries). It will be transformed into chemical energy stored in the use of the time, and then convert chemical energy into electrical energy, which is reversible, such as the chemical energy of the main characteristics of lithium batteries.

The most important feature of Lithium batteries is the high specific energy. What is the specific energy it? Than energy refers to the unit weight or unit volume of energy. With specific energy Wh / kg or Wh / L to indicate. Wh is a unit of energy, W is watts, h is the hour; kg is 1000 grams (weight units), L is liters (volume units). Give an example here to illustrate: 5, nickel-cadmium batteries rated voltage of 1.2V, the capacity of 800mAh, while the energy of 0.96Wh (1  2V × 0  8Ah). On the 5th of the same size lithium - manganese dioxide batteries Rated voltage of 3V, the capacity of 1200mAh, then the energy of 3.6Wh. Both batteries are the same size, then lithium - manganese dioxide battery energy than nickel-cadmium battery is 3.75 times!

5, a nickel-cadmium batteries, weighing about 23g, and one on the 5th of lithium - manganese dioxide battery, weighing about 18g. A lithium - manganese dioxide battery 3V, and the two nickel-cadmium battery only 2.4V. So when the battery using lithium batteries a small number (to enable portable electronic products to reduce the size, weight), and long battery life of work.

In addition Li-ion battery with discharge voltage stability, wide operating temperature range, low self-discharge, long storage life, no memory effect and pollution-free, etc..
Lithium batteries is the high cost of the shortcomings, it is still not widely used, mainly used in handheld computers, PDA, communications equipment, cameras, satellites, missiles, torpedoes, equipment and so on. As technology advances, improvements in technology and production increases, the price of lithium batteries will continue to decline, applications will be more common. Non-rechargeable lithium batteries

Non-rechargeable lithium batteries have a wide range of currently used lithium - manganese dioxide batteries, lithium - thionyl chloride batteries and lithium batteries and other compounds. This article describes only the most commonly used.

1  Lithium - Manganese Dioxide Battery (Li  MnO2)

Lithium - manganese dioxide battery is a lithium anode and a manganese dioxide as cathode, and a one-time use of organic electrolyte batteries. The main features of the battery cell voltage is high, rated voltage of 3V (ordinary alkaline batteries 2 times); the termination of the discharge voltage of 2V; energy than large (see examples above); discharge voltage stability and reliability; a better storage properties (storage time 3 years), low self-discharge rate (in the self-discharge rate of ≤ 2%); working temperature range -20 ℃ ~ +60 ℃.

The battery can make a different shape to meet different requirements, it is rectangular, cylindrical and button-shaped (button).
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