To better understand the origin of the different electrochemical response of the materials, operando XRD during the galvanostatic cycling is carried out to study the crystallographic changes during lithium (de)intercalation. MoS2 Comm (Fig. ) shows the initial (002) plane peak of 2H-MoS2, with a corresponding d-spacing of d002=0.61 nm, decreasing in intensity during the discharge plateau at 1.1 V vs. Li/Li + , while another peak emerges at corresponding to the (001) plane of the 1T-MoS2 phase (d001=0.63 nm), in good agreement with the values reported in the literature for the 1T-LiMoS2 phase . The subsequent deintercalation process appears as a solid-solution reaction, with the prominent (001) plane peak shifting to lower angles, corresponding to an expansion in the interlayer spacing (d001=0.65 nm), followed by a contraction to d001=0.62 nm at the end of the deintercalation. The initial 2H-MoS2 (002) peak is not recovered after the first cycle, which indicates an irreversible transformation from 2H-MoS2 to 1T-MoS2, in close agreement with previous reports .