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

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 50-100 nm, 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 720.6 mAh g−1 and 463.4 mAh g−1 at the current density of 150 mA g−1. After 200 cycles, the discharge and charge capacities can be remained of 399.2 mAh g−1 and 398.9 mAh g−1, respectively. Moreover, the charge rate capacities of GE@LSO/LTO composites retain 89.1% at the range of current density from 150 mA g−1 to 750 mA g−1. And its recovery rates are 91.0% when the current density back to 150 mA g−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.