The Study Of Supercapacitor With High Specific Energy In Organic System

As global demand for clean energy increases,there is an urgent need to further explore new types of clean energy and related energy storage systems to ensure efficient storage of the energy produced.Batteries and electrochemical capacitors are the main energy storage devices,but both have their own shortcomings.Although electrochemical capacitors can perform charging and discharging processes in a matter of seconds,they have lower energy densities than batteries,and have much higher power densities and can be implemented in the same cycle.Therefore,supercapacitors between electrochemical cells and conventional capacitors are considered a promising alternative to batteries,especially in the field of load balancing and energy storage devices;they are also considered to be suitable for requiring maximum power and length.Cycle life,operational stability,fast charge and discharge times,low heating levels,appropriate size/weight and low cost applications.However,in order to meet the higher requirements of future systems such as portable electronics,hybrid electric vehicles and large industrial equipment,it is necessary to improve the performance of the supercapacitor and reduce the production cost by improving the preparation process or developing new materials.Supercapacitor structures usually contain several components such as two electrodes,electrolytes,current collectors,and separators.As an important part of supercapacitors,there have been a lot of researches on electrolytes,current collectors,and isolators.For example,through the treatment of the surface of ordinary aluminum foil,the traditional aluminum foil collecting fluid is improved,and the internal resistance of electrode plate is reduced,so as to improve the performance of supercapacitor monomer.Usually,aluminum foil is carbonized by EDM,the surface properties of the collector are changed,and the corresponding electrode plates are made,and the related properties are tested.Under the same carbon-based materials,the contact resistance of aluminum foil treated by EDM is much lower than that of ordinary aluminum foil,and a great deal of research on electrolytes is done,at the same time,the contact resistance of aluminum foil treated by EDM is much lower than that of common aluminum foil.To improve the performance of supercapacitor monomers;As an electrode that determines how much energy is stored in supercapacitors,researchers have studied electrode storage devices that use a variety of materials as energy,such as activated carbon,metal hydroxide/oxide,metal sulphides and conductive polymers.It is also focusing on the study of new composite electrode materials to enhance the electrochemical performance of supercapacitor devices by improving the storage capacity of individual materials.At the same time,in order to meet the increasing demand for high power and low cost energy storage devices,increasing the energy density of conventional carbon supercapacitors has become the main goal of the researchers.The research focuses on improving the specific capacitance of active materials in order to increase the capacitance of the final device.The purpose of this thesis is to increase the specific energy intensity and specific capacitance of supercapacitors by increasing the percentage of activated carbon materials in supercapacitors.By increasing the mass load of active material in the electrode of supercapacitor,the energy storage capacity of each electrode area is improved.However,an increase in mass load will lead to an increase in electrode thickness,which usually leads to a decrease in specific capacitance and,once the electrode thickness exceeds 100 ? m,potentially counteracts the increase in surface capacitance.In our previous work,we demonstrated the high specific capacitance retention of carbon derived from titanium carbide CDCTi C-)(when the electrode thickness is as high as 1000 ?m in organic electrolytes.In this work,we report that this behavior can be extended to Coarse activated carbon)(AC.Coarse activated carbon)(AC is the most commonly used electrode material for commercial supercapacitors,which has wider pore size distribution and lower conductivity than carbon derived from carbides.As the thickness of the electrode increases from 200?m to 800?m,the area capacitance of the Coarse activated carbon)(AC electrode at the sweep rate of 5mv/s increases from 2.3F/cm2 to 7.4 F/cm2.With the increase of the mass load of the active electrode material,the mass and volume of the collector and diaphragm in the electrode stack decrease,which increases the weight and volume energy density of the device.By reporting this advantageous behavior of preparing supercapacitor thick electrodes using coarse-grained activated carbon)(AC,we want to be interested in a method of improving the performance of a porous carbon-based supercapacitor that is not developed without increasing the cost or changing the current-used supercapacitor manufacturing process.