Step-by-step progress in the preparation of graphene by ball milling

Recently, the Beijing Science and Technology Plan project undertaken by the team of Professor Dai Liming of Beijing University of Chemical Technology “Study on the macro-preparation of edge functionalized graphene technology by ball milling method” passed the acceptance of the expert group.

At present, there are problems in the common graphene production technology, such as uneven product quality and small production scale. The research team, with the support of the Beijing Municipal Science and Technology Commission, developed a simple, environmentally friendly, efficient, low-cost, macro-based method based on physical ball milling. A new technology for the preparation of graphene and edge-modified graphene. The graphene has a square resistance of 6.62 ohms/sq, a specific surface area of ​​581 m2/g, and an average layer size of less than 5 layers. A single set of equipment has been realized for 180 kg/ Annual macro-preparation ability of high-quality graphene.

Graphene prepared by this method has uniform electrical and thermal properties and exhibits excellent properties in products such as heated films and conductive materials. For example, if a small amount of the high-quality graphene is added to the conventional heating film, the electrothermal response time is shortened to half a minute, the stable temperature is mentioned from 80 ° C to 80 ° C, and energy saving is achieved by more than 20%. The graphene-related products produced based on the technology have been changed in coal. Large-scale applications have been realized in electric heating projects.