Performance of a Supercapacitor and a Battery model

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1. What is the primary energy storage mechanism in a supercapacitor?

a) Chemical reactions in electrodes
b) Electrostatic charge separation in the electric double layer
c) Mechanical energy storage
d) Thermal energy

2. Compared to a lithium-ion battery, a supercapacitor generally has ?

a) Higher energy density
b) Lower energy density and faster charge/discharge
c) Lower power density and faster charge
d) Similar performance in all aspects

3. Which characteristic is true about supercapacitors ?

a) Energy stored via chemical reactions
b) Slow charge/discharge
c) Very high self‑discharge (~30% per month)
d) Low cycle life

4. Which component typically has higher cycle durability?

a) Battery
b) Supercapacitor (hundreds of thousands to millions of cycles)
c) Both equal
d) Depends on temperature

5. Which device maintains near-constant voltage during discharge?

a) Supercapacitor
b) Battery
c) Both
d) Neither