Exploration of MnFeO₃/Multiwalled Carbon Nanotubes Composite as Potential Anode for Lithium Ion Batteries

MnFeO₃, investigated for its application in sensors, catalysis, and semiconductors, was explored for the first time as anode for lithium ion batteries in the form of MnFeO₃/multiwalled carbon nanotubes (MWCNT) composite. A scalable and highly reproducible sonochemical process was adopted to form the composite, wherein the interweaved MWCNT ensures better electronic conductivity and pinning of pristine MnFeO₃ particles with a conductive coating. MnFeO₃/MWCNT composite anode exhibits superior electrochemical properties than pristine MnFeO₃ anode in such a manner that a steady-state reversible capacity of 840 mAh g^-1 was obtained at 0.5 A g^-1 even after 50 cycles against an inferior capacity of 200 mAh g^-1 offered by MnFeO₃. Further, MnFeO₃/MWCNT composite anode shows excellent rate capability and reversibility by way of delivering appreciable capacity values of 2960 and 410 mAh g^-1 at 0.5 and 10 A g^-1, respectively. These results suggest that the currently synthesized MnFeO₃/MWCNT nanocomposite anode could be considered as a promising candidate for next-generation hybrid energy storage applications. The study is bestowed with the identification and demonstration of earth-abundant, environment-friendly, and low-cost metals, specifically, Mn- and Fe-based composite anodes for high capacity and high rate lithium ion battery applications, which is noteworthy.