| 초록 |
Despite its highest theoretical capacity, the applications of the silicon anode are still limited by severe capacity fading, which is due to pulverization of the Si particles through volume change during charge and discharge. To deal with those complications, Si nanoparticles are embedded in micro-sized porous carbon spheres (Si-MCS) via a facile hydrothermal process, in order to provide a stiff carbon framework that functions as a cage to hold the pulverized silicon pieces. The carbon framework subsequently allows these silicon pieces to rearrange themselves in restricted domains within the sphere. Hence, it demonstrates excellent cyclability, high rate capability and high specific volumetric capacity on account of increased tap density. The lithium-ion battery using the new Si-MCS anode and commercial LiNi0.6Co0.2Mn0.2O2 cathode shows a high specific energy density which is considerably higher than that of commercial graphite anodes. |
