Distinction From Symmetrical Capacitors





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KAPower vs. Symmetrical EC's

KAPower vs. Symmetrical Ultracapacitors

KAPower Nickel Carbon Supercapacitor Symmetrical EC’s, Supercapacitor, Ultracapacitors.
Energy Density Moderate / High Low / Moderate
Power Density High Moderate / High
Cycle Life High High
Self-Discharge Rate Very Low Low
Electrolyte Aqueous Organic / Aqueous /Non-Aqueous
Low Temperature Performance Excellent Moderate
Packaging Type Non-Hermetic Hermetic / Non-Hermetic
Voltage Balance None Active / Resistor
Materials Nickel & Carbon Carbon or Metal Oxide
Voltage Per Cell 1.3V to >1.6V ~0.9V to ~2.5V
KAPower is a electrochemical capacitor (a.k.a. supercapacitor or ultracapacitor)

KAPower Nickel Carbon vs. Symmetric EC’s
(a.k.a. Electrochemical Capacitors, Supercapacitors, or Ultracapacitors)

KAPower Nickel Carbon

Symmetric EC’s

Performance:

How well can it crank the engine and for how long?

  • Very low leakage current – maintains a charge for extended periods of time.
  • ESR (equivalent series resistance) is not closely dependent on temperature or state of charge. The ability to supply high power in a wide range of operating temperatures and states of charge (voltage) is great.
  • Very high energy and power density. Has a “Faradaic” process in one electrode that creates high energy density capabilities.
  • High leakage currents. Must be isolated from batteries during periods of none use.
  • ESR is dependent on temperature and state of charge. As temperature drops so does power.
  • Usually associated with fair to poor energy densities.
  • Ultimate performance and life expectancy is dependent on keeping individual cell voltages balanced with external (electronic) methods.

Safety:

Are you going to hurt yourself or others?

  • Cells are not hermetically sealed. Will not create a catastrophic failure from over charging or exposure to extreme temperature.
  • Electrolyte is a weak solution of KOH. No extreme Hazardous Materials or related issues.
  • Shipping, storage, handling and re-cycling of materials is common practice.
  • Cells must be hermetically sealed. Potential for high-pressure rupture of vessel (cell).
  • Overcharge / Exposure to high temperature extremes can cause catastrophic failure.
  • Acetonitrile electrolyte has potential to cause cyanide poisoning.
  • Shipping, storage and handling requirements may be stringent and must be adhered to.
  • Can have extreme Hazardous Material issues

Reliability:

How reliable is it for engine starting or high pulse-power applications?

  • Long shelf or storage life while maintaining a usable state of charge.
  • Will not “drain” batteries if left in a parallel connection.
  • Voltage between cells (capacitor) remains balanced as a natural occurrence.
  • Modules will leak down to 0 volts quickly. Must be “re-charged” prior to use, causing un-due stress on the batteries in the circuit.
  • Failure of the components used for electronically balancing the voltage between cells (capacitor) is problematic.