Structural and electrochemical properties of LiNiO2 cathodes prepared by solid state reaction method

Abstract

LiNiO2 samples have been prepared by solid state reaction method at different annealing temperatures. Structure of the samples clearly shows that the sharp peak is observed at (0 0 3), which indicates the fcc lattice. The morphological surface of the samples and the grain size of the integrated oxides have been analyzed by SEM. The chemical complexation of the molecules is confirmed by FTIR studies. From the optical absorption results the bandgap of LiNiO2 has been observed at 1.20 and 1.40 eV, respectively. Raman band observed at 590 cm−1 is due to the symmetric O–Ni–O stretching vibration of NiO2 units. The sample which is prepared in the form of cell is measured galvanostatically in the potential territory 2.75–5.1 V. The cyclability of the prepared sample is displayed over 30 cycles. The thickness of the cell is found to be 198 𝜇A cm−2. The discharge capacity for both the samples have been calculated, and it is found out that for the annealed sample at 1450 °C shows more cyclic performance up to 325 mAh g−1, whereas the annealed sample at 1100 °C shows up to 270 mAh g−1. The obtained results have revealed that the LiNiO2 cathode material annealed at 1450 °C may be utilized in the preparation of microbatteries and also in other power supply source applications.