Positive/negative electrode material for high-performance asymmetric capacitor and preparation method for positive/negative electrode material

Abstract

The invention relates to a positive / negative electrode material for a high-performance asymmetric capacitor. The positive electrode material is a high-specific-capacity ternary composite material: polyaniline / graphene oxide / multi-wall carbon nanotube; the negative electrode material is a potassium hydroxide activated GO / MWCNT composite material with a high specific surface area and high conductivity. An electrochemical test for the ternary positive electrode material can prove that the electrochemical performance of the ternary composite material is far better than that of a binary composite material; an electrochemical test for a simple asymmetric capacitor assembled by the negative electrode material also proves that a relatively good electrochemical performance is obtained; the preparation method is simple in process, and the raw materials are free of toxins and hazards; the microcosmic ternary structure of the obtained positive electrode material represents integrated characteristics, wherein GO provides sufficient specific surface areas and are loaded with polyaniline nanorods; the MWCNT coated with polyaniline is bridged between GO pieces; and the negative electrode material shows porous and loosening characteristics, so that the positive / negative electrode material has relatively bright application prospects in the capacitor electrode materials.

Description

technical field [0001] The invention relates to the field of preparation of nanocomposite materials, in particular to a positive and negative electrode material of a high-performance asymmetric capacitor and a preparation method thereof. Background technique [0002] In the new century, there is an urgent need for efficient and convenient energy storage devices to solve the problems caused by energy shortage and people's pursuit of high-quality life. Therefore, secondary batteries such as lithium-ion batteries and supercapacitors are favored because of their high energy conversion efficiency, portability, and reusability. Compared with lithium-ion batteries, supercapacitors have attracted more attention because they have faster charge and discharge rates, longer service life, and are more environmentally friendly. Traditional electric double layer supercapacitors have unparalleled power density and almost endless service life and play an irreplaceable role in some fields, s...

AI Technical Summary

Problems solved by technology

The electrode material of the pseudocapacitor mainly relies on the redox reaction mechanism to store energy, which brings a substantial increase in energy density, but also sacrifices the power density. In addition, because most of these capacitor electrode materials have poor conductivity, this defect more obvious

In addition, the operating voltage of symmetrical capacitors is narrow, and there is a problem that the utilization rate of energy storage materials is not high, while asymmetric capacitors increase the energy density through positive electrode materials, and maintain power density through negative electrode materials. May maintain its own advantages and combine the potential window voltage of the positive and negative electrodes to make it applicable to a wider range

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