Electrochemical performance of LiV3−xNixO8 cathode materials synthesized by a novel low-temperature solid-state method

A series of cathode materials for lithium ion batteries with the formula LiV_3−xNi_xO₈ (x = 0.000, 0.025, 0.050 and 0.100) have been synthesized by a novel low-temperature solid-state method. The synthesized cathode materials have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), discharge-charge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). These results indicate that LiV_2.95Ni_0.050O₈ shows much better electrochemical performances than LiV₃O₈. This is due to better electrochemical reversibility and lower particle-to-particle resistance after Ni²⁺ doping.