Abstract
A novel phosphorus-doped porous carbon/graphene composite was adopted as electrode material of super-capacitor, which showed excellent electrochemical performance compared with carbon material without phosphorus heteroatom by means of cyclic voltammetry, the charge/discharge property, impedance characteristics, cycle life, and stability. The P-enriched carbons sample offered an outstanding capacitive behavior, which had specific capacitance 277 F/g and was able to withstand at a wide voltage window of 1.6 V with 90.8% performance retention after 10,000 cycles at a current density of 10 Ag−1, providing a higher energy density 26.42 Wh/kg. In addition, because the thermal effect in charge and discharge process can make the supercapacitor temperature rise rapidly in a short time and affect the electrical performance, temperature characteristic is one of the important characteristics to be considered in practical application. In this paper, a two-dimensional thermal model for commonly used coiling supercapacitor with p-doped porous carbon/graphene composite as electrode material was established, and the temperature distribution of supercapacitor and the variation of internal temperature under different conditions were analyzed by finite element method. The results show that the maximum temperature appears near the center, and the maximum temperature is related to the applied current and the number of cycles. With the increase of the current, the maximum internal temperature is increased sharply, and it is kept constant after the number of cycles reaches a certain value. Cooling measures should be taken when the maximum temperature exceeds the allowable temperature range.
Highlights
With the increasing tension of petroleum resources and the increasingly serious environmental pollution, countries are forced to strive to find new energy sources and advanced energy storage technologies for sustainable development
In order to further expand its practical application, a two-dimensional thermal model for commonly used coiling supercapacitor with phosphorus-doped porous carbon/graphene (P-porous carbon/graphene (PCG)) composite as electrode material was established to discuss the thermal state in the running process, which paves the way for its practical application
It is noticeable that P-PCG has larger enclosed areas of of utilizing P-doped porous carbon/graphene in an aqueous electrolyte beyond the decomposition the Cyclic voltammetry (CV) curves and the voltammetric current densities of it are higher than that of PCG, potential of water (1.23 V), wide potential window tests were conducted by a gradual increase in the indicating a higher specific capacitance and double-layer response in P-PCG
Summary
With the increasing tension of petroleum resources and the increasingly serious environmental pollution, countries are forced to strive to find new energy sources and advanced energy storage technologies for sustainable development. Supercapacitors have higher power density, longer cycle life and, rapid charge–discharge ability with high current which has awaken industrialist to realize their various applications including national defense, military industry, aerospace, transportation, electronic information, and instrumentation etc They are one of the research hotspots in the field of new energy. Graphene is a promising energy storage material, especially for high electrochemical performance of supercapacitors It is critical for real-time and high-power applications to be capable of fast charging at high current density. Guang et al used nitrogen and phosphorus co-doped porous graphene-like carbon (N-P-PGC) for electrode material of supercapacitor at a low-cost, showing it had a large specific capacitance of 219 F/g and outstanding cycle stabilization with capacitance retention 95.6% after 10,000 cycles [10]. In order to further expand its practical application, a two-dimensional thermal model for commonly used coiling supercapacitor with P-PCG composite as electrode material was established to discuss the thermal state in the running process, which paves the way for its practical application
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