Abstract
The Hummers’ method is used to prepare graphene oxide and graphene powder, and the obtained powder material contains a large amount of oxygen-containing groups. Due to the effect of strong oxidants, there are many defects on the graphene body. Although a large number of oxygen-containing groups are reduced by the reduction reaction, the defects of the graphene body are numerous, which has a great influence on the conductivity of graphene and also limits the high carrier transport capability and application of graphene itself. Using industrial means, the graphene powder is highly reduced, and the ultrathin graphene powder is obtained, the graphene powder has extremely low impurity content, and the defects are substantially completely reduced. Then, these lay the foundation for its application in the battery industry.
Highlights
Graphene is a two-dimensional crystal composed of closely packed carbon atoms
With the “Graphene+” strategic platform, it can provide strong support for the performance improvement and application expansion of a large number of traditional materials, and at the same time, a series of new generation functional components with excellent performance will be derived [2], and the application in many traditional fields and emerging fields will cause revolution in related industries and become a strategic emerging industry leading a new generation of industrial technology
The free-state single-layer graphene has a thermal conductivity of 5000 W·mK-1 at room temperature
Summary
Graphene is a two-dimensional crystal composed of closely packed carbon atoms. A single layer of graphene was obtained by stripping off the graphite [1]. Graphene is a honeycomb two-dimensional crystal composed of a single layer of hexagonal cellular carbon atoms. In ultrahigh transmittance [4], the transmittance of single-layer graphene reaches 97.7%. The free-state single-layer graphene has a thermal conductivity of 5000 W·mK-1 at room temperature. By reducing means, such as hydrazine hydrate [12], sodium borohydride [13], and other reducing agents or heat treatment under protective or reducing atmosphere, the surface groups are removed, making it a single layer of graphite, which is graphene. The impurity content was extremely low, and the defects were almost completely reduced, and the conductivity was improved, which lay the foundation for its application in the battery industry
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