Method for preparing graphene by alkali metal intercalation

Abstract

The invention provides a method for preparing graphene by alkali metal intercalation. The method comprises the following steps that (1) in an inert environment, a graphene material is mixed with alkali metal to obtain an evenly-mixed graphene carbon material-alkali metal composite material, still standing is conducted in the inert environment, and thus metal intercalation reaction is produced; and(2) the obtained composite material is put in a liquid medium reacting with the composite material to react, an intercalation object is removed, and the graphene material is obtained through vibration, washing and separating. The invention further provides the graphene prepared through the method. According to the preparation method of the high-quality graphene, a golden yellow composite materialobtained through lithium or other highly-reactive alkali metal mixed and reacted with the graphene material is adopted to serve as a precursor, the later stage preparation process of the graphene canbe conducted under condition of room temperature, air and the like, and the method is suitable for large-scale preparation of the graphene.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a preparation method of graphene. Background technique [0002] Graphene has excellent material properties, including a huge specific surface area, high Young's modulus, electron mobility, and ultra-high thermal conductivity. Graphene consists of monolayer sp 2 Composed of hybrid carbon atoms, it is the thinnest and hardest nano-carbon material known so far, and it is almost completely transparent, light in weight, has excellent flexibility and super thermal conductivity, and is used in energy storage, catalysis, Composite materials and other fields have a wide range of applications. [0003] At present, the production and preparation methods of graphene mainly include top-down method and bottom-up method. The bottom-up growth method, such as the traditional chemical vapor deposition method, but the growth of graphene by the chemical vapor deposition...

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Problems solved by technology

The bottom-up growth method, such as the traditional chemical vapor deposition method, but the growth of graphene by the chemical vapor deposition method requires a harsh growth environment, such as high temperature and high vacuum, and a catalyst needs to be added during the deposition process Catalytic growth consumes a lot of energy during the growth process. In addition, the growth rate of this method is slow and the production cost is greatly increased, which greatly limits the application fields of this type of grown graphene.

The top-down method, such as the liquid phase exfoliation method, starts from natural graphite, adopts the method of exfoliation to prepare graphene oxide, and further reduces the preparation of graphene. Such methods generally require higher energy or strong oxides in the preparation process. Graphene is prepared by pre-treatment and post-reduction method. The graphene prepared by this method will cause many defects in the oxidation-reduction process, and the preparation cycle is also longer.

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