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

MnFeO, 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 MnFeO/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 MnFeO particles with a conductive coating. MnFeO/MWCNT composite anode exhibits superior electrochemical properties than pristine MnFeO anode in such a manner that a steady-state reversible capacity of 840 mAh g was obtained at 0.5 A g even after 50 cycles against an inferior capacity of 200 mAh g offered by MnFeO. Further, MnFeO/MWCNT composite anode shows excellent rate capability and reversibility by way of delivering appreciable capacity values of 2960 and 410 mAh g at 0.5 and 10 A g, respectively. These results suggest that the currently synthesized MnFeO/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.