Abstract:

A typical Li⁺ substituted NiO compound, Li_0.29Ni_0.71O, was synthesized by molten nitrate method, and the effect of Li⁺ ions doped on the electrochemical performance was also studied. The materail showed a smaller electrochemical capacity compared to NiO. In addition, there was an irreversible formation of Li₂O in the first discharge\|charge cycling. The kinetic behavior of Li_0.29Ni_0.71O was investigated by EIS analysis. The unusual decrease of SEI resistance and the increase of chemical diffusion coefficient in the several initial cycles were explained in terms of the transformation from crystalline to amorphous state of the electrode material.

Key words: electrochemistry, anode materials, molten nitrates method, electrochemical impedance spectroscopy