Electrical properties and electrochemical impedance spectroscopy for LiCo0.5Ni0.45Ag0.05O2 powder

Combustion technique has been successfully employed for the synthesized of nano-crystalline cathode material LiCo
_0.5
Ni
_0.45
Ag
_0.05
O
₂
(LCNAO) powder. Powders were annealed at 800°C for 8 h in an air and changes in the structural, optical, and electrical properties were studied. The structural properties of LCNAO powder were studied by means of X-ray diffraction (XRD), Vibrational spectra analysis of LCNAO powder (FTIR). The electrical properties of materials were studied using electrochemical impedance spectroscopy (EIS) technique. XRD analysis shows that all the powders are crystallized in the hexagonal layered structure (R-3m) phase and present a random orientation. The electrical conductivity showed the semiconducting nature with room temperature and decreased in conductivity for 1.8 ×10
⁴
(Ω.cm)
^-1
and raise frequency through fitting at 800°C sample, the value of Gauss fit of conductivity. These mean that the electrical qualities of LCNAO are improved by annealing. EIS of powder found results test at (800) °C, it is very necessary to check the uniformity of the lithium ion batteries. Showed good results in the middle of the cell and were stable compared to another of the annealing temperature, capacity is large and this means that the material of a small thickness and the surface is smooth and a little roughness and obtained of Nyquist plots (experimental curves). The circuit is a RC circuit and this means that the electrical circuit behaves regularly on all frequencies (low and high), a small fitting and appropriate equivalent circuit to represent.