- The lightest of all metals
- The greatest electrochemical potential
- The largest energy density for weight.
- The load characteristics are reasonably good in terms of discharge.
- The high cell voltage of 3.6 volts allows battery pack designs with only one cell versus three.
- It is is a low maintenance battery.
- No memory and no scheduled cycling is required to prolong the battery's life.
- Lithium-ion cells cause little harm when disposed.
It is fragile and requires a protection circuit to maintain safe operation.
- Cell temperature is monitored to prevent temperature extremes.
- Capacity deterioration is noticeable after one year (whether the battery is in use or not).
- Lithium polymer chemistry differentiates itself from Lithium Ion in the type of electrolyte used (a plastic-like film that does not conduct electricity but allows ion exchange – electrically charged atoms or groups of atoms).
- The polymer electrolyte replaces the traditional porous separator, which is soaked with electrolyte.
- The dry polymer design offers simplifications with respect to fabrication, ruggedness, safety and thin-profile geometry.
- Cell thickness measures as little as one millimeter (0.039 inches).
- Can be formed and shaped in any way imagined.
- Commercial lithium polymer batteries are hybrid cells that contain gelled electrolyte to enhane conductivity.
- Gelled electrolyte added to the lithium ion polymer replaces the porous separator. The gelled electrolyte is simply added to enhance ion conductivity.
- Capacity is slightly less than that of the standard lithium ion battery.
Lithium ion polymer finds its market niche in wafer-thin geometries, such as PDA batteries.
- Improved safety – more resistant to overcharge; less chance for electrolyte leakage.
Until Next Time – Dan Hagopian, BatteryShip.com
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