Nitrogen-Doped Co₃O₄@Porous Carbon Derived from Metal–Organic Frameworks for High-Performance Lithium Ion Batteries

A novel 3D metal–organic framework (CUST-705) was successfully constructed through a mixed-ligand strategy under solvothermal conditions. The synthesized framework was employed as a template to prepare nitrogen-doped porous cobalt tetraoxide carbon, named Co₃O₄@N–C. Among the derived materials, Co₃O₄@N–C-700 demonstrated the most promising performance and underwent comprehensive evaluation as an anode in lithium-ion batteries, delivering a high specific capacity of 850 mA h/g under a current density of 0.1 A/g. After 100 charge–discharge cycles, Co₃O₄@N–C-700 retained a high discharge capacity of 944 mA h/g, with its capacity retention ratio reaching 90.87%. This outcome highlights its exceptional long-term cycling durability. This study confirms the substantial potential of Co₃O₄@N–C as an anode component for lithium-ion battery systems. It further indicates the material’s promising applicability in various energy storage technologies, showcasing its adaptability for future high-performance devices.