Lithium ion polymer battery
As portable electronic devices, such as camcorders, mobile phones, notebook computers, and digital cameras, become smaller and more lightweight while at the same time becoming functionally more powerful, considerable research is being conducted into rechargeable lithium secondary batteries which have three times greater energy densities per unit weight and higher charging rates relative to conventional lead batteries, nickel-cadmium (Ni--Cd) batteries, nickel-hydrogen batteries, nickel-zinc batteries, and the like. A lithium secondary battery is generally configured to include an anode, a cathode, and a separator is interposed therebetween so as to prevent a short-circuit therebetween. An electrolyte is further included so as to provide a pathway for lithium ions between the electrodes. A lithium secondary battery generates electricity by lithium ions reciprocating between a cathode and an anode. The lithium secondary batteries are classified into lithium ion batteries and lithium polymer batteries according to the types of electrolytes. In the lithium ion battery, electricity is generated such that lithium ions move between a cathode and an anode. The lithium ion battery generally utilizes a cylindrical case or a rectangular case as a case for hermetically sealing the electrode assembly. Lithium ion polymer batteries are generally preferred over lithium ion batteries because of no risk of liquid electrolyte leakage and the capability of shaping it into any form, e.g., an ultra-thin battery. The lithium ion polymer batteries fabricated with a solid polymer electrolyte having a high ionic conductivity have advantages to solve the problems of the exudation of electrolyte solution and explosion, which have occurred in the lithium ion cell using liquid electrolyte. Lithium ion polymer batteries which utilize polymer electrolyte instead of the liquid electrolyte, are free from problems of leakage, have an improved stability and have a reduced volume because the electrolyte is impregnated into a polymer matrix. In general, a lithium ion polymer battery includes an anode, a polymer electrolyte and a cathode. The components are selected to satisfy various conditions of the secondary battery such as lifetime, capacity, temperature characteristic, stability, etc.
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