Rechargeable Mg batteries suffer from poor mobility and kinetics of divalent Mg²⁺ in host cathode materials. In this work, we have employed the dual cation co-intercalation strategy to mitigate the sluggish intercalation kinetics of Mg ions. The working principle involved pairing sluggish Mg²⁺ with faster monovalent ions, Li⁺ and Na⁺. Layered TiS₂ model cathode, together with a Mg metal anode were used for this study. Two dual cation systems were designed by using Mg[B(hfip)₄]₂-Li[B(hfip)₄] (Mg-Li) and Mg[B(hfip)₄]₂-Na[B(hfip)₄] (Mg-Na) dual-salt electrolytes. The dual cation systems delivered significantly higher initial discharge capacities of ~250 mAh g^–1 in comparison to the initial discharge capacity of ~100 mAh g^–1 (Fig. 1) delivered by the system employing the single-salt Mg [B(hfip)₄]₂ electrolyte.