Fabrication of Porous Carbon-based Nanostructure for Energy Storage and Transfer Applications

摘要

We have demonstrated a method to improve the capacity of microporous graphene electrodes by in-filling its cavities with graphene eggshells. The eggshell increases the volumetric energy density and its interconnected networks shorten the Li-ion diffusion pathway and ultimately enhance the rate capabilities. Such morphology control is also effective in improving the initial coulombic efficiency of the unfilled graphene foam by 17%. Mechanistic study using in-situ Raman and ex-situ NMR reveals that the Li intercalation mechanism of GEGF electrode resembles that of bulk graphite, that is, via stage Li-graphite intercalated compounds, although its overall capacity is higher than that of the theoretical values of graphite.