MODELING OF CARBON-BASED NANOPOROUS SUPERCAPACITOR

摘要

A model is advanced to explain peculiarities of charging process in nanoporous carbon-based supercapacitors (SC) with organic (nonaqueous) electrolyte such as the dependence of capacitance from current of charging, the shape of voltage vs charge curves at constant charging current etc. It uses the Nernst-Plank equation describing the charge transport through pores of nanodimentions. The lowered velocity as well as the limited volume of each nanopore is taken into account. The computer project was developed to simulate SC charging as the function of charging current and physical parameters describing carbon structure. A solution of the inverse problem on the basis of experimental test of SC composed from two electrodes of nanoporous carbon is performed. The excellent fitting of charging curves is reached. The evaluation of the influence of different physical parameters is presented.