Controllable Fabrication of Sn/Sb Nanodomains Improved Sb2SnO5 Anodes for Sodium Ion Batteries

Abstract

AbstractEmbedding the metal phase and modifying the microstructure is an important way to improve the storage capability of Sb2SnO5 (SSO) anodes. Pertaining to sodium‐ion batteries (SIBs), we design and fabricate Sb and Sn embedding porous carbon wires (PCWs) with SSO encapsulated (SSO@Sn/Sb‐PCWs) composite as a high capability anode in this study. Not only accelerate the Na+ ions diffusion, but also augment the stress resistance and the electrochemical reaction reversibility for the multiphase composite. Furthermore, the porous structure finely increases the ions diffusion kinetics, preventing the aggregation of Sn, Sb, and SSO particles, which achieves high reversible capacity while eliminating structure damage. As a consequence, the fabricated SSO@Sn/Sb‐PCWs electrode exhibited exceptional cycling stability, maintaining a high reversible capacity of 448 mAh g−1 after 150 charge/discharge cycles, and good rate capability with current density up to 5.0 A g−1. This new composite material studied in current work could shed light for the creation of sodium ion batteries with high specific energies in the near future.