| With the development of the world's industrialization,how to develop green and clean energy is a topic of global concern.In recent years,the national level has also proposed to build a clean,low-carbon,safe and efficient energy system during the critical period of the14th Five-Year Plan,control the total amount of fossil energy,focus on improving the utilization efficiency,deepen the reform of the power system,and build a new power system with new energy as the main body.Based on this requirement,hydrogen energy,as a recognized new energy system that partially replaces petroleum,is of great significance to develop a clean and efficient hydrogen energy production and application system.For the common hydrogen production reaction of methane steam reforming,it is necessary to solve the problem of large amount of carbon dioxide emissions after the reaction.But for another method of methane catalytic cracking hydrogen production,although it can effectively reduce the problem of carbon emissions,the amount of hydrogen produced and methane steam reforming hydrogen production reaction compared to the output of half,so in order to solve the economic benefit of the output gap,it is necessary to improve the economic value of carbon output.As for the carbon nano onions produced by hydrogen production from the catalytic cracking of methane,it has great application potential in the field of energy storage.It has high electrical conductivity,large specific surface area and nanoscale particle size.At the same time,it can increase chemical modification and have a variety of functional group loads,so it has a wealth of possibilities.In recent years,carbon nano onions has been gradually used as conductive agent,cathode material of battery and electrode material of supercapacitor.In order to expand the application range of carbon nano onions,this paper firstly applied carbon nano onions in lithium ion capacitors for the first time to explore its application prospects as the anode material for lithium ion capacitors.Meanwhile,it supplemented the lithium ion consumed in the first effect process by pre-embedding lithium.Results show that the carbon nano onions specific capacity as cathode materials is higher than that of graphite,and the ratio advantage,but the first effect is lower so lithium used in lithium-ion capacitor need to supplement source to avoid the influences on the properties of the battery,so we choose the way of external prestressing embedded lithium lithium operation,at the same time with the quality of formed activated carbon anode different ratio optimization,the best process,current density in the soft package battery of 100 m A·g-1,given a 67.9 m Ah·g-1,when the current density of 5000 m A·g-1,specific capacity is 37.6m Ah·g-1,The capacity retention rate was 55.4%.At the energy density of 88.0Wh·kg-1,the power density can reach 11.6 k W·kg-1,which is much higher than the energy density and power density value of lithium ion capacitor made of graphite material pre-embedded with lithium and activated carbon.Carbon nano onions was then used as a conductive agent to construct a symmetric capacitor in a salt-in-water electrolyte with a combination of safety and wide window stability.First to compare the compatibility of electrolyte with different carbon materials,comparing the characteristics of carbon materials for the high concentration of electrolyte,the results show that the electrolyte based on the water system,is suitable for the mesoporous structure has more material,at the same time,surface oxygen containing functional groups can make the electrolyte and electrode materials of invasive,further enhance the ion diffusion rate.CNOs as their traditional conductive agent and Super conductive agent,compared to C45 can bring specific capacity of ascension,as the electrode material due to its smaller particle size,uniform distribution can form more intense in the electrode conductive network is to make the play better capacity advantages of electrode materials for YP80 material after add up13.3%compared with not add specific capacity and the specific capacity of d promoted to17.8%,after adding CNOs YP80 material capacitor had built in the 100 m A·g-1specific capacity under current density of 48.42 F·g-1,The specific capacitance of HAC capacitor is72.52 F·g-1,which proves that CNOs material has the potential to be used as conductive additive for lithium-ion capacitors. |
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