Optimization of the carbonization temperature and composition of FeCC composites for enhanced lithium-ion battery anode performance

Abstract

The collaboration between transition metal oxides (TMOs) and metal–organic framework (MOF) materials has become an effective strategy to enhance the electrochemical performance of lithium-ion batteries (LIBs). In this study, we focused on evaluating the impact of carbonization temperature and material mass ratios on the electrochemical performance of the anode electrode. Specifically, we combined Fe₃O₄ nanoparticles with a ZIF-67 rhombic dodecahedron (FZ67) through a simple and rapid chemical method. Subsequently, an Fe₃O₄@Co₃O₄/C (FeCC) hybrid composite structure was formed via one-step carbonization to develop an anode material. The survey of mass ratios and carbonization temperatures of the hybrid composite material showed their effect on the FeCC's structure and electrochemical performances. The results showed that the hybrid FeCC composite material structure can stabilize the anode electrode structure for LIBs by limiting the volume expansion of Fe₃O₄, shortening the lithium ion diffusion time, and improving the specific capacity compared to the anode electrode based-on ZIF-67. The electrochemical analysis results showed that at a current density of 0.1 A g⁻¹, the 0.3-FeCC-700 anode electrode maintained a storage capacity of 435 mAh g⁻¹ after 80 cycles, with an efficiency that remained above 97%. Overall, the results of this study hold significant value for advancing anode materials in LIBs.