Dyartanti, E.R., Paramitha, T., Jumari, A., Purwanto, A., Nur, A., Budiman, A.W. and Nisa, S.S. 2023. A Comparative Study of Solid-State and Co-precipitation Methods for Synthesis of NMC622 Cathode Material from Spent Nickel Catalyst. Journal of Engineering and Technological Sciences. 55, 5 (Dec. 2023), 548-557. DOI:https://doi.org/10.5614/j.eng.technol.sci.2023.55.5.4.