Three-Dimensional SnS Decorated Carbon Nano-Networks as Anode Materials for Lithium and Sodium Ion Batteries.

The three-dimensional (3D) SnS decorated carbon nano-networks (SnS@C) were synthesized via a facile two-step method of freeze-drying combined with post-heat treatment. The lithium and sodium storage performances of above composites acting as anode materials were investigated. As anode materials for lithium ion batteries, a high reversible capacity of 780 mAh·g-1 for SnS@C composites can be obtained at 100 mA·g-1 after 100 cycles. Even cycled at a high current density of 2 A·g-1 , the reversible capacity of this composite can be maintained at 610 mAh·g-1 after 1000 cycles. The initial charge capacity for sodium ion batteries can reach 333 mAh·g-1 , and it retains a reversible capacity of 186 mAh·g-1 at 100 mA·g-1 after 100 cycles. The good lithium or sodium storage performances are likely attributed to the synergistic effects of the conductive carbon nano-networks and small SnS nanoparticles.