| 초록 |
N-doped carbon aerogels (NCAs) can be prepared by sol-gel process, through polymerization of precursors and freeze drying. Melamine and resorcinol, as precursors, dissolved into di-ionized water. After that add base catalyst and formaldehyde which is used for initiator to make it sol state. At freeze drying, volume shrinkage can be occurred because of high surface tension of water. This can be avoided by a solvent substitution process in which water is replaced with alcohol. Because melamine has 6 functional group, NCAs can be controlled by manipulating the amount of melamine. Because NCAs have high surface area and a lot of micro-, meso- pores, they prevent volume expansion of sulfur directly connected lithium sulfur battery efficiency. NCAs were characterized by measuring electrical property and structural forms. |
