文摘
In this report, we designed a novel SWNTs@SnO2@PPy coaxial nanocable as superior anode material for the first time. The nanosized SnO2 particles (2鈥? nm) were uniformly distributed between one dimension SWNTs core and PPy shell, as confirmed by XRD, SEM, and TEM characterizations. As an anode material for lithium ion batteries, this composite delivered a high capacity of 823 mAh g鈥? at 150 mA g鈥? after 100 cycles. Even at a high rate of 3000 mA g鈥?, a reversible capacity of 480 mAh g鈥? still remained. Furthermore, the SnO2 in this composite exhibited a large capacity of 1486 mAh g鈥? as well as good capacity retention of 95% over 100 cycles. This result indicated the completely reversible reaction between Li4.4Sn and SnO2, greatly improving the theoretical capacity of SnO2 from 782 to 1493 mAh g鈥?.