polymer lithium battery
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lithium ion batteries
Polymer Lithium-ion Batteries differentiate themselves from conventional lithium-ion battery systems in the types of both electrolyte and shell used. The original design, dating back to the 1970s, when French Professor M. Armand proposed to use a dry solid polymer electrolyte. This electrolyte resembles a plastic-like film that does not conduct electricity but allows ions exchange (electrically charged atoms or groups of atoms) . The polymer electrolyte replaces the traditional porous separator, which is soaked with electrolyte. In order to obtain excellent lithium ion conductivity, some gelled electrolyte has been added into Polymer Lithium-ion Batteries. Most of the commercial Polymer lithium-ion batteries used today for mobile phones are a hybrid cells and contain gelled electrolyte. In addition, instead of using a metal can as battery shell, Polymer Lithium-ion Batteries employ the Laminated Aluminum Foil as battery case, which is lighter, thinner, more flexible and safer. The advantages of Polymer Lithium-ion Batteries are listed as followings:
1. Very low profile - batteries resembling the profile of a credit card are feasible: cell thickness measuring as little as one millimeter (0.039 inches) .
2. Flexible form factor - manufacturers are not bound by standard cell formats. With high volume, any reasonable size can be produced economically.
3. Lightweight - gelled electrolytes enable simplified packaging by eliminating the metal shell.
4. Improved safety - more resistant to overcharge; less chance for electrolyte leakage.