Structural, electrical and electrochemical studies of copper substituted layered LiNi1/3Co1/3Mn1/3O2 cathode materials

Abstract

The copper substituted in LiNi1/3Co1/3Mn1/3O2 cathode materials are synthesized by the solid state reaction method. Here, we are presenting the details of synthesized LiNi1/3Co(1/3-x)Mn1/3CuxO2 (0, 0.05, 0.1 and 0.15) as an alternative cathode material for lithium-ion batteries. The powder X-ray diffraction (XRD) is used for confirmation of phase formation. Morphology and topography of the materials are investigated through a scanning electron microscope (SEM). The chemical composition is identified by techniques of energy dispersive X-ray spectroscopy (EDS) that is integrated with SEM. The Fourier transform infrared spectroscopy (FT-IR) technique is used to characterize the stretching and bending vibrational modes of different functional groups exist in the materials. At low frequencies, the dispersion of real parts of dielectric constant is due to space charge polarization which is observed for all the temperatures. More over charge/discharge studies are carried out to study the performance of the synthesized cathode materials. Keywords: Layered structure, Lithium nickel manganese cobalt oxides, XRD, SEM, Impedance, Charge-discharge