Effects of Mg doping on the electrochemical properties of LiNi0.8Co0.2O2 cathode material

Abstract LiNi0.8Co0.2O2 and Mg-doped LiNi0.8Co0.2O2 have been synthesized as cathode materials for lithium secondary battery via the rheological phase reaction route. The particle size distribution and morphological features are obtained by laser scattering measurements and scanning electron microscopy (SEM). X-ray diffraction (XRD) patterns indicate that single phase layered LiNi0.8Co0.2O2 and Mg-doped LiNi0.8Co0.2O2 samples are formed after calcining the precursors at 730 °C for 10 h in oxygen atmosphere. Charge–discharge tests show that the Mg-doped LiNi0.8Co0.2O2 exhibits both improved capacity and cycling stability comparing to the undoped sample. The samples are also characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).

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