Binary metal organic framework derived CoxFe3−xO4/C for lithium ion batteries

Synthesis of binary metal oxides for high-performance lithium ion batteries is a crucial but challenging project. Herein, we presented a binary metal organic framework derived method to fabric CoxFe3−xO4/C composites. During the calcination process, the metal-oxygen coordination bonds were decomposed into CoxFe3−xO4, while the organic ligands were carbonized into carbon. When applied as anode material for lithium ion batteries, the as-obtained CoxFe3−xO4/C exhibited good rate capability and long-life cycling stability, with high capacity of 1112 and 612 mAh g−1 retained after 206 cycles at 0.1 A g−1 and 250 cycles at 1A g−1. The Coulombic efficiency levelled at near 100% during the cycling.