Three-dimensional porous inorganic nonmetallic element doped graphene aerogel composite material and preparation method and application thereof

Abstract

The invention discloses three-dimensional porous inorganic nonmetallic element doped graphene aerogel composite material and a preparation method and application thereof. An aqueous solution in whichthe graphene oxide is dispersed is arranged in a reaction kettle I, and then the reaction kettle I is arranged in a reaction kettle II of which the size is larger relative to the reaction kettle I; anaqueous solution in which the inorganic nonmetallic source is dissolved is added in the gap between the reaction kettle I and the reaction kettle II; the reaction kettle I is open and the reaction kettle II is sealed and then hydrothermal reaction is performed; and the three-dimensional porous inorganic nonmetallic element doped graphene aerogel composite material which is abundant in pore passage, great in stability and uniform in distribution of inorganic nonmetallic elements without agglomeration is obtain from the product of hydrothermal reaction through washing, freezing and drying. Thecomposite material is used as the supercapacitor electrode material or the lithium ion battery negative material so as to show great electrochemical performance.

Description

Technical field [0001] The invention relates to a doped graphene aerogel composite material, in particular to a three-dimensional porous inorganic non-metallic element doped graphene aerogel composite material and in-situ preparation of the three-dimensional porous inorganic non-metal by a two-pot steam heating method The method for element-doped graphene aerogel composite material also relates to the application of the three-dimensional porous inorganic non-metal element-doped graphene aerogel composite material as a super capacitor electrode material or a lithium ion battery negative electrode material, and belongs to the technical field of energy storage device preparation field. Background technique [0002] With the rapid development of society, environmental pollution and energy shortages are increasing. Supercapacitors are currently important "green" energy storage devices. Electrode materials are an important part of supercapacitors and are a key factor affecting the per...

AI Technical Summary

Problems solved by technology

However, the surface of graphene lacks functional groups, the wettability is poor, and it is easy to agglomerate, and its excellent performance is "overwhelmed". Therefore, solving the agglomeration problem of graphene and improving the specific capacitance are the keys to the practical application of graphene supercapacitors.

However, the specific capacitance of a single graphene material is still not high. In order to further improve its performance, the hydrothermal method is currently used to modify graphene by doping N, B and other elements. For example, Wu Zhongshuai used the hydrothermal method to prepare N and B co- Doped graphene material, when the scan rate is 1mV / s, its specific capacitance is about 239F / g, and the specific capacitance of the nitrogen-doped graphene airgel material prepared at the same time is about 190F / g, and the boron-doped graphene airgel The material is about 228F / g

Although the performance is better than that of the undoped graphene material (181F / g), the two-dimensional graphene material prepared by the hydrothermal method is still prone to stacking and agglomeration, the element doping process is not uniform, and the single element doping has a negative effect on the material. Issues such as limited performance improvement

Images