Preparation method for manganese dioxide-carbon nanotube-foamed nickel composite material capacitor electrode

Abstract

The invention discloses a preparation method for a manganese dioxide-carbon nanotube-foamed nickel composite material capacitor electrode, and the method comprises the following steps: (1), preparinga carbon nanotube-foamed nickel composite: selecting foamed nickel as a catalysis and substrate material, directly carrying out the growth of a carbon nanotube through a chemical vapor deposition method, and obtaining the carbon nanotube-foamed nickel composite; (2), synthesizing a manganese dioxide-carbon nanotube-foamed nickel composite material through a hydrothermal method: preparing lauryl sodium sulfate: KMnO4 solution with the concentration ratio being in the section of 0.5-5: 5-15, carrying out the dripping of the mixture into a reaction still after the full mixing, putting an MWNT-foamed nickel material in the reaction still for reaction under the temperature of 100-200 DEG C for 1-15h, and obtaining the manganese dioxide-carbon nanotube-foamed nickel composite material; (3), obtaining a manganese dioxide-carbon nanotube-foamed nickel composite material capacitor electrode after the preforming of the manganese dioxide-carbon nanotube-foamed nickel composite material. The method is advantageous in that an MnO2-MWNT-foamed nickel composite material capacitor displays the excellent structure and electrochemical and supercapacitor characteristics, and has the remarkable technological advantages.

Description

technical field [0001] The invention belongs to the field of energy storage materials and devices, in particular to a method for preparing a manganese dioxide-carbon nanotube-foam nickel composite capacitor electrode. Background technique [0002] Supercapacitors have incomparable advantages to the currently widely used lithium batteries: high capacitance, simple structure, high power density, fast charge and discharge rates, wide operating temperature range, and environmental friendliness. Therefore, supercapacitors have broad application prospects in industries such as automobiles and consumer electronics. Compared with lithium batteries, the energy density of supercapacitors is still relatively small, and it is very important to study substances with high specific capacitance characteristics as electrode materials for supercapacitors. The electrode material of a supercapacitor is one of the key factors determining its capacitive performance. Therefore, the key to solving...

AI Technical Summary

Problems solved by technology

The above pathways are ubiquitous in MWNT / MnO 2 The composite material is not well bonded to the substrate and is easy to fall off from the substrate, which affects the charge transfer resistance and electrochemical activity of the active material, which in turn affects the charge-discharge and cycle life of the electrode

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