| 초록 |
Recently, metal oxides are one of the most promising materials to replace graphite anodes for lithium-ion batteries (LIBs) due to high energy density, low cost, and high theoretical capacitances. Meanwhile, ZIF (Zeolitic imidazolate framework)-67, a highly porous zeolite type metal-organic framework (MOF), has been deliberately chosen as a precursor because it can facilely from cobalt nanoparticles. In this study, a novel Co nanoparticles wrapped by carbon nanotubes (CNTs) nanostructure was derived from ZIF-67 by calcination under 10%H2/N2 atmosphere at 700oC with in-situ growth of CNTs. Use the obtained material as anode for LIBs, they delivered an initial discharge capacity of 780mAh/g at a current density of 50 mA/g, and after 100 cycles, the capacity was maintained at 558.6 mAh/g. Excellent cycle stability and Li+ storage capacity were originated from the nanostructures. All of these attractive results make the unique Co/CNTs a promising electrode material for application in LIBs. |
