Co3Sn2/SnO2 nanocomposite loaded on Cu foam as high-performance three-dimensional anode for lithium-ion batteries

Abstract

It is a challenge to commercialize tin dioxide-based anodes for lithium-ion batteries due to their low rate capability and poor cycling performance of the electrodes. Herein, we synthesized a three-dimensional Co₃Sn₂/SnO₂ nanocomposite on copper foam (3D-CS@CF) via a simple method followed by calcination, and employed it as an anode for lithium-ion batteries. The experimental results reveal that the Co₃Sn₂ and SnO₂ nanoparticles were uniformly loaded on the copper skeleton, and the 3D-CS@CF nanocomposite possessed a cross-linked 3D network. As a binder- and conductive-free anode for LIBs, 3D Co₃Sn₂/SnO₂ exhibited good electrochemical performance with a high reversible capacity of 1010.5 mA h g⁻¹ at a current density of 250 mA g⁻¹ after 100 cycles. The extraordinary performance can be ascribed to the unique 3D architecture of the 3D-CS@CF, which inhibits aggregation and accommodates volume expansion, providing a path for the fast ionic diffusion and electron transport. The positive synergistic effect of Co₃Sn₂ and SnO₂ nanoparticles also benefits the electrochemical reaction process.