Graphene / activated carbon composite material as well as preparation method and application thereof

The preparation of graphene/activated carbon composite materials by high-temperature self-propagating reaction solves the problems of complexity and high cost of traditional methods, and achieves performance improvement of high-efficiency lithium-ion capacitor cathode materials, which are suitable for energy storage devices.

CN121990569APending Publication Date: 2026-05-08INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
0 Cites 0 Cited by

Patent Information

Application Number
CN202610154324.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-03
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Traditional graphene-based composite materials are complex and costly to prepare, which limits their application in lithium-ion batteries and supercapacitors. Furthermore, activated carbon cathodes suffer from problems such as poor matching of specific surface area and pore structure with electrolyte ions, high bulk/interface resistance, and insufficient electron-ion synergistic channels.

Method used

Graphene/activated carbon composite materials were prepared by high-temperature self-propagating reaction. Magnesium powder and magnesium citrate were reacted in a CO2 atmosphere to generate porous activated carbon and form small-sized, wrinkled graphene sheets on its surface, forming interconnected electron channels and hierarchical pores, which enhanced the conductivity and stability of the material.

Benefits of technology

It achieves a synergistic improvement in high capacity, high rate capability, and high coulombic efficiency. The material structure is stable, the preparation method is simple and can be applied on a large scale, and it is suitable for lithium-ion capacitor cathode materials.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides a graphene / activated carbon composite material and a preparation method and application thereof, and belongs to the technical field of nano materials, the graphene / activated carbon composite material comprises a carbon matrix and a two-dimensional sheet material covering the carbon matrix; the carbon matrix is an activated carbon material and is a carbon material prepared by performing high-temperature pyrolysis on magnesium citrate in a high-temperature self-propagating reaction process; the two-dimensional sheet material is a graphene material and is a few-layer carbon material which is prepared by converting CO2 through a high-temperature self-propagating reaction and is formed by arranging carbon atoms according to a honeycomb-shaped two-dimensional lattice. According to the invention, graphene is used as a conductive and structural dual skeleton; and a hierarchical pore structure is constructed by utilizing gas production and template effect in the reaction process, so that the electrochemical performance of the active carbon positive electrode is improved. And a proper amount of graphene can provide more active sites and maintain the structural stability at the same time, so that the specific capacity and the cycle life are remarkably improved and prolonged, and the material has a wide application prospect and is particularly suitable for preparing a high-performance lithium ion capacitor positive electrode material.
Need to check novelty before this filing date? Find Prior Art