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Infrared Spectroscopy Signatures of Aluminum Segregation and Partial Oxygen Substitution by Sulfur in LiNi0.8Co0.15Al0.05O2

Substitution of aluminum in nickel-rich layered oxides plays a vital role in structural and thermal stability. Hence comprehension of aluminum distribution in nickel-rich layered oxides such as LiNi0.8Co0.15Al0.05O2 (LNCA) is crucial. However, investigation of aluminum distribution in LNCA is extremely challenging, and sophisticated techniques such as 27Al and 7Li MAS NMR, individual atom probe tomography, X-ray and neutron diffraction, and SQUID magnetic susceptibility measurements are recently employed. We demonstrate the use of a combination of versatile techniques such as X-ray diffraction, energy dispersive X-ray analysis mapping, and vacuum Fourier transform infrared spectroscopy to identify the distribution of aluminum and anion substitution at the oxygen site in LNCA synthesized by the coprecipitation-assisted solid-state reaction. The influence of metal salts used for the coprecipitation of α/β interstratified Ni1–x–yCoxAly(OH)2 (x = 0.15, y = 0/0.05) on anion substitution at the oxygen site in L...