Graphene supported Li2SiO3/Li4Ti5O12 nanocomposites with improved electrochemical performance as anode material for lithium-ion batteries

Abstract

Graphene supported Li2SiO3@Li4Ti5O12 (GE@LSO/LTO) nanocomposites have been synthesized via a hydrothermal route and following calcination. LSO/LTO nanospheres are adhered to the graphene nanosheets with the size of 50–100nm, in which both LSO and LTO particles are attached together. When tested as the anode for lithium ion batteries, the initial discharge and charge capacities of GE@LSO/LTO are 720.6mAhg−1 and 463.4mAhg−1 at the current density of 150mAg−1. After 200 cycles, the discharge and charge capacities can be remained of 399.2mAhg−1 and 398.9mAhg−1, respectively. Moreover, the charge rate capacities of GE@LSO/LTO composites retain 89.1% at the range of current density from 150mAg−1 to 750mAg−1. And its recovery rates are 91.0% when the current density back to 150mAg−1. In addition, the reversible capacity and cycle stability of GE@LSO/LTO are better than that of LTO and LSO/LTO. The reasons can be attributed to the synergistic effect between GE and LSO/LTO as well as the features of GE supports.