Porous asphalt/graphene composite for supercapacitors with high energy density at superior power density without added conducting materials

2017 ◽  
Vol 5 (41) ◽  
pp. 21757-21764 ◽  
Author(s):  
Miao Zhang ◽  
Zhenhe Sun ◽  
Tengfei Zhang ◽  
Bin Qin ◽  
Dong Sui ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Parameter Optimization ◽  
High Energy ◽  
High Energy Density ◽  
Porous Asphalt ◽  
Graphene Composite ◽  
Conducting Materials ◽  
Cost Efficient

Full parameter optimization enables a cost efficient supercapacitor with high energy density at superior power density.

scholarly journals Na0.76V6O15/Activated Carbon Hybrid Cathode for High-Performance Lithium-Ion Capacitors

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 122
Author(s):  
Renwei Lu ◽  
Xiaolong Ren ◽  
Chong Wang ◽  
Changzhen Zhan ◽  
Ding Nan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Power Density ◽  
Cathode Materials ◽  
Low Cost ◽  
Lithium Ion ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Artificial Graphite

Lithium-ion hybrid capacitors (LICs) are regarded as one of the most promising next generation energy storage devices. Commercial activated carbon materials with low cost and excellent cycling stability are widely used as cathode materials for LICs, however, their low energy density remains a significant challenge for the practical applications of LICs. Herein, Na0.76V6O15 nanobelts (NaVO) were prepared and combined with commercial activated carbon YP50D to form hybrid cathode materials. Credit to the synergism of its capacitive effect and diffusion-controlled faradaic effect, NaVO/C hybrid cathode displays both superior cyclability and enhanced capacity. LICs were assembled with the as-prepared NaVO/C hybrid cathode and artificial graphite anode which was pre-lithiated. Furthermore, 10-NaVO/C//AG LIC delivers a high energy density of 118.9 Wh kg−1 at a power density of 220.6 W kg−1 and retains 43.7 Wh kg−1 even at a high power density of 21,793.0 W kg−1. The LIC can also maintain long-term cycling stability with capacitance retention of approximately 70% after 5000 cycles at 1 A g−1. Accordingly, hybrid cathodes composed of commercial activated carbon and a small amount of high energy battery-type materials are expected to be a candidate for low-cost advanced LICs with both high energy density and power density.

scholarly journals Novel Lithium-Ion Capacitor Based on a NiO-rGO Composite

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3586
Author(s):  
Qi An ◽  
Xingru Zhao ◽  
Shuangfu Suo ◽  
Yuzhu Bai
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Power Density ◽  
High Power ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
Cycle Life ◽  
High Energy Density ◽  
Lithium Ion Capacitor

Lithium-ion capacitors (LICs) have been widely explored for energy storage. Nevertheless, achieving good energy density, satisfactory power density, and stable cycle life is still challenging. For this study, we fabricated a novel LIC with a NiO-rGO composite as a negative material and commercial activated carbon (AC) as a positive material for energy storage. The NiO-rGO//AC system utilizes NiO nanoparticles uniformly distributed in rGO to achieve a high specific capacity (with a current density of 0.5 A g−1 and a charge capacity of 945.8 mA h g−1) and uses AC to provide a large specific surface area and adjustable pore structure, thereby achieving excellent electrochemical performance. In detail, the NiO-rGO//AC system (with a mass ratio of 1:3) can achieve a high energy density (98.15 W h kg−1), a high power density (10.94 kW kg−1), and a long cycle life (with 72.1% capacity retention after 10,000 cycles). This study outlines a new option for the manufacture of LIC devices that feature both high energy and high power densities.

Construction of mesoporous Cu-doped Co9S8 rectangular nanotube arrays for high energy density all-solid-state asymmetric supercapacitors

2019 ◽  
Vol 7 (10) ◽  
pp. 5333-5343 ◽  
Author(s):  
Wen Lu ◽  
Ze Yuan ◽  
Chunyang Xu ◽  
Jiqiang Ning ◽  
Yijun Zhong ◽  
...  
Keyword(s):  
Solid State ◽  
Energy Density ◽  
Power Density ◽  
High Energy ◽  
High Energy Density ◽  
Nanotube Arrays ◽  
Asymmetric Supercapacitors

A self-templating strategy was used to prepare novel mesoporous Cu-doped Co9S8 rectangular nanotube arrays (Cu-Co9S8 NTAs) as an advanced electrode for all-solid-state asymmetric supercapacitors, which deliver a high energy density of 71.93 W h kg−1 at a power density of 750 W kg−1.

scholarly journals Glycerolized Li+ Ion Conducting Chitosan-Based Polymer Electrolyte for Energy Storage EDLC Device Applications with Relatively High Energy Density

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1433 ◽  
Author(s):  
Ahmed S. F. M. Asnawi ◽  
Shujahadeen B. Aziz ◽  
Muaffaq M. Nofal ◽  
Muhamad H. Hamsan ◽  
Mohamad A. Brza ◽  
...  
Keyword(s):  
Energy Density ◽  
Polymer Electrolyte ◽  
Specific Capacitance ◽  
Power Density ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Equivalent Series Resistance ◽  
Ion Conducting ◽  
High Dielectric

In this study, the solution casting method was employed to prepare plasticized polymer electrolytes of chitosan (CS):LiCO2CH3:Glycerol with electrochemical stability (1.8 V). The electrolyte studied in this current work could be established as new materials in the fabrication of EDLC with high specific capacitance and energy density. The system with high dielectric constant was also associated with high DC conductivity (5.19 × 10−4 S/cm). The increase of the amorphous phase upon the addition of glycerol was observed from XRD results. The main charge carrier in the polymer electrolyte was ion as tel (0.044) < tion (0.956). Cyclic voltammetry presented an almost rectangular plot with the absence of a Faradaic peak. Specific capacitance was found to be dependent on the scan rate used. The efficiency of the EDLC was observed to remain constant at 98.8% to 99.5% up to 700 cycles, portraying an excellent cyclability. High values of specific capacitance, energy density, and power density were achieved, such as 132.8 F/g, 18.4 Wh/kg, and 2591 W/kg, respectively. The low equivalent series resistance (ESR) indicated that the EDLC possessed good electrolyte/electrode contact. It was discovered that the power density of the EDLC was affected by ESR.

Polystyrene sphere-mediated ultrathin graphene sheet-assembled frameworks for high-power density Li–O2 batteries

2015 ◽  
Vol 51 (67) ◽  
pp. 13233-13236 ◽  
Author(s):  
Chang Yu ◽  
Changtai Zhao ◽  
Shaohong Liu ◽  
Xiaoming Fan ◽  
Juan Yang ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Graphene Sheet ◽  
High Power ◽  
High Energy ◽  
High Energy Density ◽  
High Power Density ◽  
Polystyrene Sphere

Polystyrene sphere-mediated ultrathin graphene sheet-assembled aerogels were configured, exhibiting high energy density and power density for Li–O2 batteries.

Graphene-based ordered mesoporous carbon hybrids with large surface areas for supercapacitors

2018 ◽  
Vol 42 (9) ◽  
pp. 7043-7048 ◽  
Author(s):  
Yun Deng ◽  
Aifei Xu ◽  
Wangting Lu ◽  
Yanhua Yu ◽  
Cheng Fu ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Mesoporous Carbon ◽  
Specific Capacity ◽  
High Energy ◽  
Ordered Mesoporous Carbon ◽  
High Energy Density ◽  
Long Cycle Life ◽  
Surface Areas ◽  
Ordered Mesoporous

Graphene-ordered mesoporous carbon hybrids exhibited advanced specific capacity, high energy density and power density, and long cycle life.

scholarly journals In situ construction of yolk–shell zinc cobaltite with uniform carbon doping for high performance asymmetric supercapacitors

2018 ◽  
Vol 6 (19) ◽  
pp. 9109-9115 ◽  
Author(s):  
Xiaoya Chang ◽  
Lei Zang ◽  
Song Liu ◽  
Mengying Wang ◽  
Huinan Guo ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Performance ◽  
High Energy ◽  
Carbon Doping ◽  
High Energy Density ◽  
Asymmetric Supercapacitors

Yolk–shell ZnCo2O4 with in situ formed carbon shows great potential for supercapacitors, which delivers high energy density and power density.

scholarly journals Application of supercapacitors in electric traction storage systems

2018 ◽  
Vol 180 ◽  
pp. 02002
Author(s):  
Miroslaw Lewandowski ◽  
Marek Orzylowski ◽  
Maciej Wieczorek
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Storage Systems ◽  
High Energy ◽  
High Energy Density ◽  
Current Pulses ◽  
Combined Use ◽  
Lower Energy Density ◽  
Electric Traction ◽  
Better Than

Energy storage systems (ESS) are based on electrochemical batteries and supercapacitors (SC). SCs have a lower energy density compared to batteries, but have an advantage over them in power density. The combined use of the two in a hybrid ESS (HESS) gives both high energy density and high power density of ESSs. Fractional-order impedance describes the SC dynamics better than commonly used integer order impedance. Such a description can be based on the dielectric relaxation equations e.g. Cole-Cole equation used in this work. The paper compares results of the impedance approximation of a number of SC’s with various fractional and integer models, on the basis of which the time responses are analysed. The methods of capacitance and ESR measurement recommended by the IEC standard are examined. They are compared with the methods used in practice by SC producers. The problem of energy losses in ESS with respect to charging/discharging current pulses is presented. A proper ESS designing requires an accurate approximation of the SC impedance over the frequency band in which the dominant part of the power spectrum of current pulses is located.

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