Preparation and lithium ion batteries properties of SnS2 nanoparticle/reduced graphene oxide nanosheet nanocomposites using supercritical carbon dioxide

• We develop a good approach to synthesize of SnS2/RGO nanocomposites.
• Small SnS2 nanoparticles are uniformly distributed on the RGO nanosheets surface.
• SnS2/RGO shows good reversible capacity, rate performance and cycle stability.

Graphene-based nanocomposites have been widely investigated as promising anode materials because of the high specific capacity and good rate capability. However, effective distributing the nanomaterials into graphene conductive network still remains some challenges. In this study, the supercritical carbon dioxide (SC-CO2) route as a good strategy is developed to prepare SnS2/reduced graphene oxide (RGO) nanocomposites, which integrates the complementary effect of ultrasmall SnS2 nanopaticle and RGO nanosheet in the nanocompositions. The SnS2/RGO nanocomposite exhibits high initial discharge capacity of 1466.1 mA h g−1 (100 mA g−1), good capacity retention of about 492 mA h g−1 (100 mA g−1) after 70 cycles and good rate capacity as an anode material for lithium ion batteries. These results demonstrate that supercritical CO2 (SC-CO2) possess significant technological value to enhance the energy storage properties of other two-dimensional (2D) nanocomposites.

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