Lithium Polymer Battery - Advantages and Limitations

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LITHIUM ION POLYMER BATTERY

The Li-polymer differentiates itself from other battery systems in the type of electrolyte used. The original design uses a dry solid polymer electrolyte. This electrolyte resembles a plastic-like film that does not conduct electricity but allows an exchange of ions.

The dry polymer design offers simplifications with respect to fabrication, safety and thin-profile geometry. There is no danger of flammability because no liquid or gelled electrolyte is used. With a cell thickness measuring as little as one millimeter, equipment designers are left to their own imagination in terms of form, shape and size.

Most of the commercial Li-polymer batteries used today for mobile phones are a hybrid and contain gelled electrolyte. 

Although the characteristics and performance of lithium ion and lithium polymer batteries are very similar, the Li‑ion polymer is unique in that solid electrolyte which replaces the porous separator. The gelled electrolyte is simply added to enhance the ion conductivity.



ADVANTAGES
  • Very low profile — batteries that resemble the profile of a credit card are feasible.
  • Flexible form factor — With high volume, any reasonable size can be produced economically.
  • Light weight – gelled rather than liquid electrolytes 
  • Simplified packaging
  • Improved safety — more resistant to overcharge 
  • Less chance for electrolyte leakage

LIMITATIONS
  • Lower energy density
  • Decreased cycle count compared to Li-ion 
  • Expensive to manufacture 

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