| 초록 |
Graphene features high surface area and electrical conductivity. Such properties are, however, lost in practical devices, which is mainly attributed to restacking of the 2D material. Herein, we synthesized hollow microspheres of 2D plate-like carbon materials in which restacking of the plate is inhibited and its characteristic property is maintained in the 3D macroscopic structure (30~40 μm). Dehydration of glucose, a molecular precursor, under hydrothermal conditions is modified by organic crystals of cooperative assembly between melamine and cyanuric acid, i.e. MCA. The resulting carbon materials carbonized at 600 degrees C. It was found that the microspheres exhibit superior Li-ion and Na-ion storage capacity compared to the conventional carbon or metal oxide materials. The unique turbostratic structure of hard-type carbons is responsible for the high performance as is evidenced in XPS, XRD, EIS, CV, and GCPL data. |
