For constant current and nearly constant capacitance,
(1)
An ideal supercapacitor therefore has approximately linear charge and discharge ramps, making a triangular voltage–time trace. Series resistance adds an immediate voltage step when current starts and a step of magnitude when it reverses directly from to . Leakage and voltage-dependent capacitance introduce curvature.
A secondary battery instead follows electrode chemical potentials as its state of charge changes; many chemistries have broad plateaus or sloping plateaus, with polarization separating the charge and discharge curves. This distinction is typical rather than universal: some batteries have steeply sloping profiles, while strongly potential-dependent pseudocapacitive materials can depart substantially from a triangle.
Figure 1.
Idealized supercapacitor and battery responses, with capacitance–potential alternatives
. Original schematic curves; the lower panels distinguish a constant differential capacitance, a double-layer minimum and a localized redox contribution. They are alternative models, not a universal measured curve. Details.

Ancestors (11)

  1. ii
  2. 7
  3. Section A(iii)
  4. Paper 1
  5. 2022
  6. Past exam of the MPhil in micro- and nanotechnology enterprise course of the University of Cambridge
  7. MPhil in micro- and nanotechnology enterprise course of the University of Cambridge
  8. Course of the University of Cambridge
  9. University of Cambridge
  10. List of universities
  11. Home

View article source

Discussion (0)

New discussion

There are no discussions about this article yet.

Articles by others on the same topic (0)

There are currently no matching articles.
See all articles in the same topic Create my own version