A High Capacity Nano ­ Si Composite Anode Material for Lithium Rechargeable Batteries

A nano-Si composite material (NSCM) has been prepared by mixing nanometer-scale (78 nm) pure Si powder and carbon black. The electrochemical performance of NSCM anodes for lithium rechargeable batteries exhibited an extremely high reversible capacity, over 1700 mAh/g Si, at the tenth cycle. The voltage profile is flat and smooth ranged from 0.4 to 0.0 V vs. Li/Li+. In addition, the cyclic performance is good even at larger current densities. Consequently, NSCM can be used as a novel high capacity anode material for lithium-ion batteries. (C) 1999 The Electrochemical Society. S1099-0062(98)10-053-6. All rights reserved.