Preparation And Electrochemical Performance Of Thin Electrolyte Layer Supercapacitor

Due to the low specific energy and the expansion and contract ion of electrode materials in electrochemical reaction,the cycle life of traditional supercapacitor is short,limiting its extensive application.For the thin electrolyte layer supercapacitor studied in this thesis,energy was stored in electrolyte which is electrochemically active,and electrolyte itself undergoes redox reaction during charging/discharging process.Since there is no solid phase change and ion transport in solid phase involved during charging/discharging process,the new type of supercapac itor exhibits excellent cycling performance.Specific capacitance of this supercapacitor was determined by the amount of active material in electrolyte,and the specific capacitance and power can be optimized by adjusting the concentration of the electrolyte.The structure,energy storage mechanism and critical technologies of thin electrolyte layer supercapacitor was further analyzed.In this paper,we used SEM to study the structural characteristics of the porous electrode.The surface tension of the electrode makes the electrolyte be immobilized in the pores of the porous electrode,and then adsorbed on the surface of the carbon nanotube,and shortened the time required for the electrolyte transferring to the surface of the carbon nanotube,as a result of supercapacitor batteries with large magnification characteristics.And the uniformity of the prepared porous electrode was obtained by statistical analysis.The effects of electrolyte with different molar concentrations on the electrochemical properties were investigated.1.2V 75 m Ah and 1.2V 150 m Ah supercapacitor single cell were assembled using 2.0mol/L electrolyte,cycling performance as well as rate and low temperature performance were studied.Meanwhile,effect of sampling precision of the testing equi pment on the cycling performance was analyzed.Finally,we studied different capacity,different wire form and the cooling measures on the cycle life of the supercapacitor module.The conclusions were made as follows: the welding process must have cooling measures to ensure the cycle life of the supercapacitor;the copper nickel belt as the wire is more conducive to the enhancement of life cycle of supercapacitor;the supercapacitor module testing(or use)in the process of cooling must be full to ensure the cycle life of supercapacitor.In this paper,the best cycle life of the module reaches 7000 times.