Supercapacitors should not be used for applications such as ripple absorption because of their high internal resistance (several
hundred mΩ to a hundred Ω) compared to aluminum electrolytic capacitors. Thus, its main use would be similar to that of secondary
battery such as power back-up in DC circuit. The following list shows the characteristics of supercapacitors as compared to aluminum
electrolytic capacitors for power back-up and secondary batteries.
Secondary Battery
NiCd
Back-up ability
Eco-hazard
Operating Temperature Range
Charge Time
Charge/Discharge Life Time
Restrictions on Charge/Discharge
Flow Soldering
Automatic Mounting
Safety Risks
–
Cd
-20 to +60ºC
few hours
approximately 500 times
yes
not applicable
not applicable
leakage, explosion
Lithium Ion
–
–
-20 to +50ºC
few hours
approximately 500 to 1,000
times
yes
not applicable
not applicable
leakage, combustion,
explosion, ignition
–
–
-55 to +105ºC
few seconds
limitless (*1)
none
applicable
applicable
heat-up, explosion
Capacitor
Aluminum Electrolytic
Supercapacitor
–
–
-40 to +85ºC (FR, FT)
few seconds
limitless (*1)
none
applicable
applicable
(FM and FC series)
gas emission (*2)
(*1) Aluminum electrolytic capacitors and supercapacitors have limited lifetime. However, when used under proper conditions, both can operate within a
predetermined lifetime.
(*2) There is no harm as it is a mere leak of water vapor which transitioned from water contained in the electrolyte (diluted sulfuric acid). However, application of
abnormal voltage surge exceeding maximum operating voltage may result in leakage and explosion.
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