Synthesis and properties of LiNiO<sub>2</sub> close to stoichiometric composition obtained by combined synthesis method

This study presents the synthesis and characterisation of lithium nickelate LiNiO₂ with near-stoichiometric composition prepared by a combined method. LiNiO2 exhibits high electrochemical properties including a theoretical capacity of 250–270 mA/g, making it a promising cathode material for lithium-ion batteries as an alternative to LiCoO2. However, the commercial use of LiNiO₂ is limited by the difficulty in achieving stoichiometric composition and the high cost of conventional synthesis methods. Using X-ray phase analysis and spectrometry, we identified the phases formed and determined their chemical composition. Electron microscopy and Brunauer-Emmett-Teller (BET) techniques were used to investigate the structure and morphology. The developed process scheme led to the preparation of lithium nickelate with the composition Li(0.98)Ni(1.02)O₂, providing the formation of nanoscale samples with high specific surface area and improved electrochemical performance. These results emphasise the potential of LiNiO2 as a competitive cathode material for lithium-ion batteries.