| 초록 |
A crumpled configuration of graphene is desirable for preventing irreversible stacking between individual nanosheets. Herein a sea-urchin-shaped template approach is introduced for fabricating highly crumpled graphene balls in bulk quantities with a simple process. The crumpled balls exhibit larger surface area and good water-dispersion stability than those of stacked rGO or other crumpled approaches, even though they also show comparable electrical conductivity. We demonstrated that highly crumpled graphene balls exhibited superior EDLC electrochemical performance. However, EDLCs have limited energy density, which restricts applications to power delivery over only several seconds. In order to obtain higher energy density, a new “Lithium Ion Hybrid Supercapacitors (LIHSs)” is attracting much attention. LIHSs represent an attempt to bridge the gap between conventional batteries and supercapacitors. For this purpose, we chose LiFePO4/3D crumpled graphene ball composites for electrode. |
