The article presents comparisons of the electrical characteristics of supercapacitor cells with initial electrodes and modified tantalum nanoparticles and hypothesizes on the mechanism influencing the change in the initial electrical characteristics of the material. Compared to electrodes made from raw materials, the electrode modified with tantalum nanoparticles has noticeably better electrical characteristics. In particular, the specific capacity of the modified material consistently exceeds the initial capacity for 5,000 cycles: by 13% (119 F/g versus 104 F/g) by 1000 cycles, by 20% (112 F/g versus 90 F/g) by 2000 cycles, by 33% (111 F/g versus 74 F/g) to the 3000 cycle, by 63% (107 F/g versus 40 F/g) to the 4000 cycle and by 37.7 times (113 F/g versus 3 F/g) to the 5000 cycle. Electrical resistance has also decreased significantly. By cycle 1000, the discharge resistance of the modified electrode was 0.3 ohms versus 0.5 ohms for the original one (a 40% decrease). By cycle 5000, the difference became more pronounced: 0.3 ohms for the modified versus 3.5 ohms for the original (a decrease of 11.7 times). A similar trend is observed for charge resistance: 0.3 ohms versus 0.6 ohms (a 50% decrease) by 1000 cycles and 0.3 ohms versus 3.0 ohms (a 10-fold decrease) by 5000 cycles. It is important to note that the resistance of the modified electrode remained stable at 0.3 ohms during both charge and discharge throughout the entire test for up to 5,000 cycles. Based on the results obtained, a hypothesis was put forward about the effect of tantalum nanoparticles on the electrical characteristics of the studied active carbon-containing material based on CB fabric. Tantalum nanoparticles, entering the structure of the material, participate in the transfer of electric charges, reducing the electrical resistance of the material and thereby increasing its specific capacity. They form stable additional charge transfer pathways. This, in turn, leads to a significant and steady decrease in the total electrical resistance of the electrode (both during charging and discharge) and, as a result, to a significant increase in specific capacity and exceptional cycling stability of the modified material.