S anionic redox should both contribute to K storage and the extent to which S anionic redox contributes should be higher than Route B, because deeper discharge depth (0.001 vs. 0.2 V) could promote more Mo reduction and as a result, more irreversible Mo oxidation and more S oxidation. As shown in Figure , S 0 was observed after the 1 st and 2 nd charge in the XPS (Figures and) and Raman spectra (Figure ), with more noticeable signals after the 2 nd charge compared to Route B. Also, S6 2-and S5 2-absorption peaks were observed in the UVvis absorption spectrum (Figure ). ) shows the total collapse of the pristine layered structure (Figure ), likely increasing K-ion interparticle diffusion resistance. In contrast, discharging to 0.001 V in cycle1 and raising the discharge depth to 0.2 V from cycle2 (Route B) can balance between maximizing dual cationic and anionic redox activity and minimizing surface deterioration and structural collapse, because the dual redox activity is activated in cycle1 and at the same time, the MoS2 structure is less prone to collapse from cycle2 after the extent to which the conversion reaction takes place is reduced. The electrode after 1000 cycles (Figures and) show a much smoother surface with more defined texture and without cracks via Route B compared to Route A. Layered structure was retained with expanded interlayer spacings (Figure ). Additionally, metallic Mo nanoclusters might act as active sies to bind polysulfides and hinder the shuttle effect. Collectively, these contributing factors enable long-term cycling stability and rate capability via Route B. Therefore, utilizing cationic and anionic dual redox activity can be advantageous for storing K in MoS2, but the execution of it needs to be balanced.