Synthesis of lithium-nickel-based complex oxides for energy storage

Složeni metalni oksidi jedni su od najistraživanijih vrsta spojeva zbog svojih raznolikih svojstava i primjene, posebno u današnje vrijeme kada postoje sve veći zahtjevi za inovativnim materijalima sa širokim spektrom svojstava. Ovim radom istraživane su optimalne količine litijevih iona dopiranih u sustav niklova oksida, s ciljem nastanka različitih kristalnih struktura Li-Ni-O sustava. Svi spojevi sintetizirani su modificiranom citratnom sol-gel sintezom uz provođenje kalcinacije u struji zraka, pri temperaturama od 600°C i 700°C. Nastali produkti detaljno su okarakterizirani pomoću nekoliko analitičkih metoda: rentgenske difrakcije na prahu (PXRD), termogravimetrijske analize s razlikovnom pretražnom kalorimetrijom (TGA/DSC) te analize specifične površine Brunauer–Emmett–Teller metodom (BET) i poroznosti teorijom funkcionala gustoće (DFT).Complex metal oxides are one of the most investigated types of compounds due to their diverse properties and applications, especially nowadays when there are increasing demands for innovative materials with a wide range of properties. This work presents the fundamental research of the optimal amounts of lithium ions doped into the nickel oxide system, with the aim of producing different single-phase Li-Ni-O systems. All compounds were synthesized by a modified citrate sol-gel synthesis with calcination in a stream of air, at temperatures of 600°C and 700°C. The products were characterized in detail using several analytical methods such as: powder X-ray diffraction (PXRD), thermogravimetric analysis with differential scanning calorimetry (TGA/DSC), specific surface area analysis using the Brunauer–Emmett–Teller method (BET) and porosity analysis using the density functional theory method (DFT)