Method for preparing graphene aerogel supported carbon nanotube and ZIF-67 lithium battery electrode material

Abstract

The invention discloses a method for preparing a graphene aerogel supported carbon nanotube and a ZIF-67 lithium battery electrode material. The method comprises the steps of preparing a graphene oxide by performing a chemical oxidation stripping method on natural graphite powders; adding the graphene oxide into a carbon nanotube (CNTs) to carry out ultrasonic treatment; preparing a compound (GAS@CNTs) of a porous graphene aerogel (GAS) and the CNTs through a hydrothermal method and a freeze-drying method; and stirring the compound with a ZIF-67 solution, stewing, after that, the graphene aerogel (GAS), the supported carbon nanotube (CNTs) and a ZIF-67 lithium battery electrode material (GAS@CNTs@ZIF-67) can be prepared. The key of the method is preparing the compound of the GAS and the CNTs is prepared through the hydrothermal method and the freeze-drying method, and then adding the ZIF-67, stirring evenly and dispersing, vacuum drying and obtaining the GAS@CNTs@ZIF-67 lithium battery electrode material; and besides, an electrochemical test shows that, the relative specific capacity of the novel graphene aerogel supported carbon nanotube and the ZIF-67 lithium battery electrode material is high, the cycling stability is good, and the novel graphene aerogel supported carbon nanotube and the ZIF-67 lithium battery electrode material are commercialized and can be applied to pure electric vehicles.

Description

technical field [0001] The invention relates to a method for preparing graphene airgel-loaded carbon nanotubes and ZIF-67 lithium battery electrode materials, and belongs to the technical field of lithium ion power battery electrode material preparation. Background technique [0002] Aerogels are a class of monolithic materials with a well-developed pore structure, which has the advantages of low density, low thermal conductivity, and well-developed pores. Graphene aerogel (GAS for short) is called graphene sponge, graphene monaolith or graphene foam. It not only has the advantages of conventional aerogels, but also has the conductive properties of carbon aerogels and a unique three-dimensional pore structure, and this unique structure makes it have more electrochemically reactive sites than graphene, so it is extremely Greatly improved its lithium storage performance. Carbon nanotubes and graphene have similar properties in terms of electrochemistry and mechanics, but the...

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Problems solved by technology

[0003] Lithium-ion batteries are widely used in mobile phones, notebook computers, electric vehicles (EV) and other fields due to their stable cycle performance and high energy density. However, with the progress of the times and the development of technology, traditional lithium batteries with graphite as electrodes Ion batteries have been difficult to meet people's requirements for energy storage devices

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