Enhancing the energy storage properties of dielectric polymer capacitor films through composite materials has gained widespread recognition. Among the various strategies for improving dielectric materials, nanoscale coatings that create structurally controlled multiphase polymeric films have shown great promise.
Overall, the specific use of silicon as an earth-abundant material capable of being transformed into a high performance electrochemical capacitor through application of a thin surface coating opens new avenues both toward grid-scale and integrated device applications.
1. Introduction Electrochemical capacitors (often called supercapacitors or ultracapacitors) are devices capable of storing electric energy in the electrical double–layer, which is formed at the electrode/electrolyte interface.
Based on the obtained results, it is concluded that the corrosion process of current collectors significantly influences the long–term performance of electrochemical capacitors. This influence appears much faster than the degradation of the electrode material and cannot be neglected once long–term performance is evaluated.
High-energy-density dielectric materials play a crucial role in advanced energy storage devices for emerging electronic and power applications. However, most existing polymer dielectrics for film capacitors still struggle to meet the trade-off between high Ud and high η.
In the case of supercapacitors with siloxane coatings deposited on the surface of the current collectors (SC/12), the same trend is observed, i.e., the increase of the charge transfer resistance (R ct) up to 20 cycles, followed by a decrease and then another increase. The only difference is that R ct starts to decrease again after the 40th cycle.