A kind of preparation method of supercapacitor electrode covered with active electrode film

Abstract

The invention discloses a preparation method of a supercapacitor electrode covered with an active electrode film. The conductive foil substrate is pretreated by degreasing, washing, pickling, and washing, and then plating nickel-copper-iron on the surface of the treated conductive foil. Phosphorus alloy film, then in-situ synthesis of composite (hydr) oxide film by hot alkali corrosion, and finally cyclic activation to prepare supercapacitor electrode covered with active electrode film. The supercapacitor electrode covered with the electrode film prepared by the present invention has good conductivity, mechanical properties, corrosion resistance and heat resistance, small internal resistance, high specific capacitance, high bonding force between the electrode film and the current collector, and uniform thickness of the electrode film and other advantages; the specific capacitance of the prepared supercapacitor electrode reaches 1.45F / cm2, and the capacitance retention rate reaches 98.1% after 3500 cycles. Moreover, the preparation method provided by the invention has the characteristics of less required equipment investment, simple and easy-to-control process operation, good repeatability, and suitability for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of a supercapacitor electrode, in particular to a preparation method of a supercapacitor electrode covered with an active electrode film. Background technique [0002] Supercapacitors have the advantages of high safety, high power density, long cycle life, and high current charge and discharge. They are new energy storage devices that have been researched by various countries in recent years. The application prospect is very broad. [0003] Since electrodes are the core components of supercapacitors, new electrode materials have become a research hotspot and focus in the field of supercapacitors. Electrode materials for supercapacitors mainly include carbon materials, metal (hydr) oxides, and conductive polymers. The heat resistance of metal (hydr) oxide electrode materials is better than that of conductive polymer electrode materials; and when the electrode surface area is the same, the capacitance value...

AI Technical Summary

Problems solved by technology

[0006] 1. The preparation process of the electrode is complicated, and there are many factors affecting the performance of the electrode, resulting in poor repeatability;

[0007] 2. Poor conductivity, which is not conducive to electron transmission during charging and discharging, resulting in low power density;

[0008] 3. The mechanical properties are poor, which limits the application in complex stress situations;

[0009] 4. High requirements on the corrosion resistance of current collector materials;

[0010] 5. The electrode material film and the current collector are synthesized by pressing, the bonding force is poor, and the film thickness is uneven;

[0011] 6. Large internal resistance, poor anti-overcharge and over-discharge and short-circuit performance, and poor safety

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