Silicon/Graphite/Carbon Nanotubes Composite as Anode for Lithium Ion Battery

Abstract

Silicon/graphite/ carbon nanotubes (Si/G/CNTs) material was prepared by ball milling and annealing in a special condition. Each sample was characterized by XRD, SEM, and electrochemical testament. The results revealed that Si/G/CNTs exhibited an initial specific discharge capacity of 2326 mAh g−1. After 35 cycles, a high reversible capacity of 1363 mAh g−1 is still retained and the reversible capacity retention is nearly 86%. The improved electrochemical properties were due to the CNTs uniform dispersion in the inter-space of Si and graphite materials. This feature of CNTs not only has excellent electron conductivity, but can also alleviate the SEI film.