| As a new energy storage component between traditional capacitors and batteries,supercapacitors have the advantages of high specific capacity,high power density,good cycle stability,fast charge and discharge speed and environmental friendliness.As an emerging supercapacitor,the all-solid supercapacitor adopts a gel-based solid electrolyte,which overcomes the defects of traditional liquid electrolytes that are difficult to store,leaks,and has low safety,and promotes the development of wearable flexible supercapacitors.It has gradually become the focus of research at home and abroad.In this paper,three metal oxide tantalum capacitor materials with outstanding electrochemical properties were prepared under different conditions.The electrode materials obtained under different conditions were characterized by scanning electron microscopy and X-Ray Diffraction test.Comparing the electrochemical properties,the electrochemical properties of the electrode materials were explained microscopically as a function of the preparation conditions.On this basis,a symmetric double-layer all-solid supercapacitor with activated carbon material as positive and negative electrode and PVA/KOH gel as electrolyte was prepared.At the same time,an all-solid hybrid supercapacitor with tantalum capacitor electrode material and activated carbon electrode material as positive and negative electrodes and PVA/KOH gel as electrolyte was synthesized.Cyclic voltammetry,constant current charge and discharge test and cycle performance test were carried out for different capacitance systems and compared.Finally,for different asymmetric Faraday tantalum capacitors,different concentrations of redox additive KI were added to the PVA/KOH gel electrolyte,and the specific capacitance and cycle performance of the supercapacitor system under different concentrations of KI were compared.The variation of supercapacitor capacity with KI concentration. |
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