Multi-layered carbon coated Si-based composite as anode for lithium-ion batteries

Si-based composite with multi-layered structure composed of multicomponent carbon was successfully prepared via a two-step in-situ carbon coating process. The physicochernical properties of the composite were characterized by TG-DTA, XPS, XRD, SEM, TEM, Raman and electrochemical Measurements. XPS-reveals the presence-of reduced graphene oxide. SEM and TEM images demonstrate that the nano-Si particles are well dispersed in multi-layered carbon matrix constructed by resin-pyrolyzed carbon and reduced graphene oxide. Used as anode material for lithium-ion batteries, the prepared Si@C@RGO composite exhibits improved electrochemical performance. The electrochemical results indicate that the composite exhibits a high initial charge capacity of 1474.9 mAh g(-1), with an initial columbic efficiency of 7457%. The composite also delivered a higher charge capacity at various current densities, and show good rate performance, which is partly attributed to the stable multi-layered structure. (C) 2017 Published by Elsevier B.V.