The chlorination behavior of Li(Ni1/3Co1/3Mn1/3)O2 (NCM) was investigated as a function of the reaction temperature (400-600℃) and time (1-8 h) for application in a chlorination-based recycling process. Structural analysis results revealed that chlorination leads to a sequential transition from a hexagonal LiMO2 structure to a hexagonal Li1-x'MO2-y' (observed only at 400℃), a hexagonal Li1-xMO2-y (x≥x', y≥y', at 400-600℃), and a spinel-type M3O4 phase (≥500℃, M represents Ni,Co,Mn). It was also found that this structural transition is accelerated by an increase in the reaction temperature, except at 600℃, where the thermal decomposition of the Li1-xMO2-y phase inhibited the formation of the M3O4 phase. Weight changes of the samples suggested that the chlorination of the transition metals begins at 500℃ and that its rate increases with an increase in the reaction temperature. It was revealed by a composition analysis that an increase in the reaction temperature (except at 600℃) and longer times result in a higher Li removal ratio. A temperature of 550℃ was proposed as the optimum temperature for the chlorination of NCM in consideration of the findings from this work.