Preparation of NiMn 2 O 4 -NiMnO 3 @MoS 2 Nano-composites with Enhanced Electrochemical Performances for Lithium-ion Batteries

With the technological development in rechargeable lithium-ion batteries (LIBs), there have been a requirement for advanced anodes to complete the demand of energy storage devices. Among the developed anode, Mixed Transition Metal Oxides (MTMOs) are one of the evolving categories. MTMOs provide a synergistic effect due to the presence of multiple elements which enhance the electrochemical performance. Similarly, 2D MoS₂ have been an emerging anode for Lithium-ion Batteries. Therefore, in this work, the preparation of NiMn₂O₄-NiMnO₃@MoS₂(NMO-MoS₂) nano-composites have been attempted. Structural, microstructural and other physicochemical characterization have been investigated by X-ray diffraction, Scanning Electron Microscopy. Electrochemical characterizations also analyzed via Cyclic Voltammetry, Electrochemical Impedance Spectroscopy, and Galvanostatic Charge-Discharge analysis. In the MoS₂ type of composite, the layered structure of MoS₂ provides intercalation of lithium ions without any major volume expansion of NiMn₂O₄-NiMnO₃ (NMO) material. Furthermore, NMO nanoparticles occupy the spaces between the MoS₂ nanosheets making both faces accessible to electrolyte penetration. The resulting composite material displayed a stable cyclic voltammogram profile and discharge capacity of 361.54 mAhg^-1 even after 200 cycles at the current density of 500mA g^-1.