| 초록 |
Li-ion batteries (LIBs) can provide high energy densities with high round-trip energy efficiency in which electrochemical performances are highly dependent on active electrode materials. In this study, we fabricated honeycomb-shaped activated carbons (HACs) from renewable bio-resources by a simple heat-treatment with potassium hydroxide. The HACs exhibit a high specific surface area of 3,396.2 m2 g-1 and multitudinous nanopores. In addition, a large number of redox-active heteroatoms were introduced on the carbon building blocks of HACs. Thereby, the HACs showed high specific capacity of 480 mAh g-1 at 0.2 A g-1 in a cathodic voltage region. Moreover, stable cycling behaviors over 300 cycles were achieved with a Coulombic efficiency of ~100%. |
