| 초록 |
To take full advantage of graphene in macroscale devices, it is important to integrate two-dimensional graphene nanosheets into a micro/macrosized structure that can fully utilize graphene’s nanoscale characteristics. To this end, we developed a novel spray-dying process to create a spherically integrated graphene oxide wrapped silicon microstructure. And then this carbon coating on reduced graphene oxide wrapped silicon microsphere improves the electrochemical performance of lithuim ion battery, in contrast to nanoassembled graphene, which is attributed to its structural. Furthermore, this synthesis method can also produce an effective graphene-based hybrid microsphere structure, in which Si nanoparticles are efficiently entrapped by graphene nanosheets during the assembly process. When used in a Li-ion battery, this material can provide a more suitable framework to buffer the considerable volume change that occurs in Si during electrochemical lithiation/delithiation, thereby improving cycling performance. |
