열분해 공정을 통해 합성된 산화 코발트 나노입자의 리튬 전기화학반응성

Abstract

Nano-sized cobalt (II) oxide nanoparticles with a high crystallinity were synthesized using thermolysis of a Co 2+ -oleate precursor at 310℃. The phase and morphology of as-prepared cobalt oxide nanoparticles were characterized using X-ray diffraction, high-resolution transmission electron microscopy, and Brunauer-Emmett-Teller surface area measurements. The cobalt oxide nanoparticles were found to be spherical nanoclusters with an average diameter of approximately 200 nm, consisting of tiny nanocrystals (10-20 nm). Furthermore, the Li electroactivites of the cobalt oxide nanoparticles were investigated using cyclic voltammetry and galvanostatic cycling. The cobalt oxide nanoparticles could deliver high capacities over 420 mA h g -1 at a C/5 current rate.