Mesoporous CoFe2O4 octahedra with high-capacity and long-life lithium storage properties

Abstract

In this work, we present the synthesis of mesoporous CoFe₂O₄ octahedra via the sol–gel method and their application as anode materials for lithium-ion batteries. The samples are characterized with XRD, SEM, and BET techniques. Based on the combined advantages of porous features, anisotropic octahedral structural stability, and multicomponent effect, CoFe₂O₄ achieves good electrochemical lithium storage, especially with a high capacity (992 mA h g⁻¹ at 0.1 A g⁻¹ after 200 cycles) and ultralong cyclic life (3000 cycles at 5 A g⁻¹). Moreover, the structural stability of CoFe₂O₄ octahedra is probed by decomposing the electrodes after they have been cycled.