The Effect of Synthesis Temperature on Interlayer Mixing in Layered Rock Salt Cathode Materials LiNi0.7Mn0.1Co0.2O2 for Li-Ion Batteries Application
The interlayer mixing of layered rock salt cathode materials LiNi0.7Mn0.1Co0.2O2 that prepared by mixed hydroxide method at various temperatures (750-950°C) has been studied. X-ray Diffraction (XRD) was used to determine a suitable temperature range to obtain the fully reacted sample. Phase of pure sample was obtained at high temperature above 850°C. The results of XRD show that the LiNi0.7Mn0.1Co0.2O2 samples are iso-structural with α-NaFeO2 with space group of R-3m.The sample that heated at 900°C exhibits a well-ordered and lower cation mixed layered structure than others. Rietveld refinement using XRD data was used to determine the amount of interlayer mixing vary as a function of temperature. Refinements data showed that the interlayer mixing varies depend upon the synthesis temperature and the optimum temperature to prepare LiNi0.7Mn0.1Co0.2O2 with the lowest amount of interlayer mixing was 900°C.