| 초록 |
Si, one of the most promising anode materials with high theoretical capacity (4000 mAh g-1) for Li ion batteries, suffers from volumetric change-induced pulverization and surface solid electrolyte interphase (SEI) formation, both of which lead to capacity fading during the charge/discharge cycles. Herein, we prepared novel core-shealth composites in which Si nanoparticles are enclosed inside conductive indium tin oxide (ITO) nanofibers by co-electrospinning. Encapsulating Si nanoparticles by hollow nanofibers allows accommodating significant volumetric change, while ITO shealth is not only inert to Li ion so as not to form undesirable SEI, but also promotes the electronic conduction even in the absence of additional conducting carbon phase. These well-engineered composites enable us to achieve high performance anodes with excellent capacity retention of 1320 mAh g-1 after 200 cycles and good rate capability. |
