| 초록 |
Graphite, as an anode material, has been generally employed in commercial Li-ion batteries to increase the storage ability of Li ions. However, since its theoretical capacity (372 mAhg-1) is not sufficient for next generation Li-ion batteries, non-carbon-based anode materials (Si, Al, and Sn etc.) having superior specific capacity have attracted attention. In recent years, Si has been extensively investigated owing to its high theoretical capacity (3579 mAhg-1), low reactivity with an electrolyte, and relative abundance. However, Si undergoes lithiation induced volume expansion (~ 300 %) when operating the device, which results in the performance reduction by large mechanical stresses and subsequent pulverization. Effective nano-structuring of Si enables alleviation of lithiation induced volume expansion. Herein, multi-scale nanocarbon/SiO2 hybrids were prepared as an anode of Li-ion battery. Because SiO2 has high initial irreversible/reversible capacities (3744 mAhg-1/1961 mAhg-1) as much as Si, and can be prepared by simple process, hybridization of multi-scale nanocarbon and nanostructured porous SiO2 realized an electro-conductive anode with a high specific surface area. |
