Preparation method of supercapacitor electrode material based on carbonized melamine foam-coated Bi2O3 nanosheets

Abstract

The invention discloses a preparation method of a supercapacitor electrode material based on carbonized melamine foam-coated Bi2O3 nanosheets. The preparation method comprises the following steps: (1)carrying out hydrothermal reaction on water-soluble bismuth salt and the carbonized melamine foam; (2) removing residual solvents, Bi <3+> and NO3 <-> by using a cleaning agent to obtain an intermediate product; (3) reacting in an inert atmosphere, annealing the intermediate product and filtering to obtain the supercapacitor electrode material based on melamine carbide foam-coated Bi2O3 nanosheets. The invention provides a simple solvothermal method. According to the method, Bi2O3 nanosheets are grown on carbonized melamine foam in situ to form a three-dimensional nuclear sheath structure. The electrode material has good electrical conductivity and high specific surface area. The storage of electrolyte is facilitated and the diffusion path of electrolyte ions is shortened. The contact area of the electrolyte and the material is increased, so that the capacitance is improved. Moreover, when the capacitor is constructed, the use of a binder and a conductive additive is avoided. The prepared material can be made into a flexible electrode. The preparation method is simple, harmless to the environment and low in cost.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a carbonized melamine foam@Bi 2 O 3 Preparation method of nanosheet supercapacitor electrode material. Background technique [0002] With the rapid development of modern technology, new concept electronic products such as highly integrated, lightweight, portable, wearable, and implantable are constantly emerging. With the advent of smart electronic products, it is urgent to develop micro-nano energy storage devices that are highly compatible with them to solve power problems. As an emerging energy storage device, supercapacitors have attracted widespread attention due to their ability to bridge the gap between batteries and traditional capacitors. To meet the huge demand for practical applications, it is imperative to develop a supercapacitor with high energy density and high operating voltage while maintaining high power density and long cycle life. Supercapacito...

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Problems solved by technology

[0003] Carbon materials usually have relatively low capacitance. In the prior art, heteroatoms are often doped to improve capacitance, such as patent CN201810212762.6, but their electrochemical stability, redox reversibility, and cycle stability are poor.

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