In this study, new insights into the all-dry synthesis of the LiNiMnCoO (NMC622) cathode using a single-phase rock-salt (RS) oxide precursor are provided. It was found that use of a larger amount of excess Li content not only can enhance the electrochemical performance of NMC made from the RS-precursor but also increase the degree of homogeneity of the NMC cathode material. XRD analysis showed that lithiation of the RS-precursor (, formation of the O3-phase) starts at a higher synthesis temperature (∼450 °C) than that is required when using a hydroxide precursor (HP) and lithium carbonate (∼350 °C). Consequently, LiCO was consumed by the reaction with the HP at low temperatures before the temperature reached the LiCO melting point. In contrast, the reduced lithiation kinetics of the RS-precursor results in the presence of liquid LiCO during the synthesis, which rapidly increases the rates of precursor lithiation and increases the NMC primary particle size.
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