Unique interconnected graphene/SnO2 nanoparticle spherical multilayers for lithium-ion battery applications

Abstract

We have designed and synthesized a unique structured graphene/SnO₂ composite, where SnO₂ nanoparticles are inserted in between interconnected graphene sheets which form hollow spherical multilayers. The hollow spherical multilayered structure provides much flexibility to accommodate the configuration and volume changes of SnO₂ in the material. When it is used as an anode material for lithium-ion batteries, such a novel nanostructure can not only provide a stable conductive matrix and suppress the mechanical stress, but also eliminate the need of any binders for constructing electrodes. Electrochemical tests show that the unique graphene/SnO₂ composite electrode as designed could exhibit a large reversible capacity over 1000 mA h g⁻¹ and long cycling life with 88% retention after 100 cycles. These results indicate the great potential of the composite for being used as a high performance anode material for lithium-ion batteries.