| 초록 |
In recent days, as cutting-edge devices become more sophisticated, the battery performance is required to be higher. As a result, metal oxides having a capacity several times larger than that of carbon have attracted attention as a candidate for a next-generation secondary battery. CoO is very attractive anode material due to its relatively high theoretical capacity of 716 mAh/g. The nanostructured materials, especially mesoporous structure can play a leading role in electrochemical properties since its high surface area, large surface-to-volume ratio, and stable buffer effect against volume expansion. These characteristics provide especially anode materials with a lot of advantages which are fast ion/electron transfer, sufficient contact interface between active materials and electrolyte. Although bulk CoO maintains its own stable phase, mesoporous CoO gradually forms Co3O4 with Co metal through disproportionation process. It appears to be no significant difference in the TEM image by the disproportionation process, however, the changes in XRD and BET show that its nano pores and overall structure transform to another phase, and thus the electrochemical performance also changes. |
