We first investigated the GCD profiles of the MoS2 electrodes cycled in the range of 0.001 to 2.5 V (denoted as Route A in Figure ) in the half-cell configuration, as this has been the voltage range (i.e., deep discharge) used in the literature to study MoS2 as an anode material of PIBs. As shown in Figure , the first discharge curve exhibited three voltage plateaus, suggesting a multi-step potassiation process. XRD patterns (Figure ) were obtained for the discharge products at the end of each voltage plateau (stage II: discharge to 0.5 V, stage III: discharge to 0.2 V, and stage IV: discharge to 0.001 V, shown in Figure ). At stage II, the (002) peak was broadened and a new peak at 8.9° appeared, which indicates the initial K-ion intercalation retains the layered structure but expands the interlayer spacing, forming an intermediate phase KxMoS2 (x = ~0.4). Further discharging to stage III caused more K-ion intercalation, as evidenced by the increase in peak intensity at 8.9° and near disappearance of the original (002) peak. From stage III to IV, a long and stable voltage plateau appeared at ~0.1