Impact of copper do** on the electrochemical response of MnSe₂ as anode for lithium-ion battery

Abstract

Transition Metal Chalcogenides (TMC), due to their unique physicochemical properties, are studied in various fields and have potent applications in energy storage applications. This work is based on the synthesis and characterization of copper-doped manganese di-selenide and the effect of its do** on electrochemical performance as anode material for lithium-ion battery applications using the solvothermal method. The characterization techniques used are X-ray diffraction, Raman spectroscopy, field-emission scanning electron microscopy, XPS, UV–visible absorption spectroscopy, and electrochemical analysis. The XRD data confirms the formation of MnSe₂ exhibiting Cubic crystal geometry. The FESEM images show the micro-cube-like structure with agglomerated nanocluster nanostructures on the surface with a dimension of 100–200 nm. The do** of the copper has decreased the band gap of the MnSe_2, as studied by the UV–visible absorption spectrum. The electrochemical performance is analyzed as anode material for lithium-ion batteries. The charge/discharge measurements show a specific capacity of 706 mAh g⁻¹ as the initial discharge capacity and 336 mAh g⁻¹ as the initial charge capacity at 0.1 A g⁻¹ current density. Meanwhile, 3% Copper-doped MnSe₂ showed a better specific capacity of 878 mAh g⁻¹ as the initial discharge capacity and 461 mAh g⁻¹ as the initial charge capacity at 0.1 A g⁻¹ current density. Cyclic stability, rate capability, and electrochemical impedance spectroscopy were performed, and it shows that 3% copper-doped MnSe₂ has good stability and better conductivity and charge kinetics, indicating copper do** has enhanced the electrochemical performance of pristine MnSe₂.