Michael Best & Friedrich LLP
Method for directly preparing expanded graphite or graphene under normal temperature and normal pressure
Provided are a method for directly preparing expanded graphite or graphene under normal temperature and normal pressure, a graphene material, and a product. The method comprises the following specific steps: firstly dispersing graphite in an acidic medium containing an oxidizing agent, and then enabling obtained suspension liquid to stand under normal temperature and normal pressure, thus obtaining expanded graphite. The method does not involve any high-temperature high-pressure reaction process, is safe in operation, low in energy consumption and high in efficiency, and is environmentally-friendly. Obtained expanded graphite can realize 50-1500 times of volume expansion, and an sp2 hybridization structure of a graphene sheet layer is basically not damaged; and the obtained expanded graphite can be widely applied to the fields of energy storage, heat management, photoelectronic devices, solar cells, anti-corrosive materials, various composite materials, and the like. The prepared expanded graphite can also be used as a precursor for preparing high-quality graphene, and the high-quality graphene basically containing no defects can be obtained by peeling off the expanded graphite.
FUDAN UNIVERSITY
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Yufei Hongbin Jiajia
Chen Lu Zhang