Rheological Phase Synthesis and Electrochemical Properties of Mg-Doped LiNi[sub 0.8]Co[sub 0.2]O[sub 2] Cathode Materials for Lithium-Ion Battery

and Mg-doped have been synthesized via the rheological phase reaction route. The particle size distribution is obtained using laser scattering measurements. The morphological features are observed by a scanning electron microscope. Electrochemical tests show that the Mg-doped exhibits an improved capacity, cycling stability, and rate performances compared to undoped samples. The samples are also characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Furthermore, possible mechanisms of Mg-doping are discussed based on the defect reaction.