| 초록 |
Sn-based materials have been considered as a promising anode material for high-power LIBs because of their abundance, appropriate working voltage, high theoretical capacity (992 mAh g-1), and high electrical conductivity of Sn. However, nano sized Sn suffers from capacity fading during the charge/discharge process due to aggregation and severe volume change (~300%). In this work, ultrafine Sn nanoparticles loaded on nitrogen- and phosphorus-doped hollow carbon framework was prepared and studied as an anode material for LIBs. The hollow structure of carbon can provide a void space to accommodate the volume expansion of the Sn nanoparticles and prevents pulverization of the electrode during the charge/discharge process. Also, the hollow carbon structures are interconnected by graphene which enables rapid lithium ion and electron transport to give an enhanced rate performance. Also, the doping elements (N and P) in carbon framework stabilize the electrochemical performance. |
