Abstract
In this study, the internal resistance with the increasing of electrode thickness in a typical nanoporous carbon-based supercapacitor and their corresponding electrochemical performances were designed and investigated in detail. As for the carbon-based double electrode layer electrochemical system, electrochemical experiments greatly support the fact of nonlinear dependence and indicate that the curve of internal resistance vs. electrode thickness can have a minimum value when the thickness increasing from 10 to 140 μm. To explain the underlying mechanisms responsible for the nonlinear dependence, a theoretical model based on a porous electrode/electrolyte electrochemical system was proposed. As expected, the results of calculations carried out in the framework of the proposed model can be very good agreement with the experimental data. According to the calculation, the optimized electrode thickness is 53.1 μm corresponding to the minimum value of SC internal resistance. Obviously, the current research results might greatly support the nonlinear conclusion instead of linear relationship between the internal resistance and the electrode thickness and may shed some light on the fabrication and exploration of supercapacitors with high power density.
Highlights
Capacity can be influenced by the parameters of the conductivity, surface area and pore size distribution of carbon material, binder content, electrode thickness, and et al Among these parameters, large specific surface area of porous carbon material used in the SC electrodes can facilitate the achievement of high specific energy density in the final SC device
According to the reports in the literature, the Rin depends on the following factors: (i) the contact resistance between the metal Al current collector and the electrode component made of a porous carbon material; (ii) resistance resulted from the interelectrode region; (iii) resistance from the electrode component and soaked with electrolyte
It can depend on many factors: (i) size of pores of the activated carbon material, (ii) composition of the material used for production of the energy-storage electrode component, (iii) electrolyte composition, and (iv) thickness of the energy-storage electrode component
Summary
Capacity can be influenced by the parameters of the conductivity, surface area and pore size distribution of carbon material, binder content, electrode thickness, and et al Among these parameters, large specific surface area (over 1000 m2/g) of porous carbon material used in the SC electrodes can facilitate the achievement of high specific energy density in the final SC device. According to the reports in the literature, the Rin depends on the following factors: (i) the contact resistance between the metal Al current collector and the electrode component made of a porous carbon material; (ii) resistance resulted from the interelectrode region; (iii) resistance from the electrode component and soaked with electrolyte. From here on, such the electrode components will be referred to as the energy-storage electrode components. By tuning the electrode thickness alone over a wide range from 10 to 140 μm in the course of experiments (the rest of system parameters remaining constant), it is found that the theory calculations can agree well with the experimental results
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