Small quantities of cobalt deposited on tin oxide as anode material to improve performance of lithium-ion batteries

Abstract

In this report, we present a hybrid structure involving a small quantity of Co element uniformly deposited on porous SnO₂ spheres as stable and high capacity anode materials for lithium-ion batteries. Specifically, Co element deposited on SnO₂ nanomaterials exhibited an exceptional reversible capacity of 810 mA h g⁻¹ after 50 cycles which is higher than the pure SnO₂ electrode. Based on the experiments results, a possible mechanism for the change of this structure during lithium ion insertion/extraction was proposed. The minute quantity of Co element uniformly deposited on SnO₂ spherical structure could prevent Sn aggregation during charging–discharging, and high porosity of the spherical structure allowed the volume expansion during lithium ion alloying/dealloying. The SnO₂ deposited with small quantities of Co element as electrode facilitated improved performance of lithium ion batteries with higher energy densities.