Combination Displacement/Intercalation Reaction of Ag0.11V2O5 Cathode Realizes Efficient Manganese Ion Storage Properties

Aqueous manganese-ion batteries (AMIBs) are becoming more noticeable because of their excellent theoretical capacity, outstanding safety profile, and cost-effectiveness. However, there aren't many studies on cathode materials appropriate for AMIBs, and the manganese-ion storage mechanisms within these materials have not been thoroughly investigated. Furthermore, the electrochemical performance of existing cathode materials remains suboptimal. Here, Ag_0.11V₂O₅ is designed and synthesized as the cathode material and introduces the combination displacement/intercalation reaction mechanism to the manganese ion storage for the first time. Ag_0.11V₂O₅ demonstrates a capacity retention of 90.3% after 1200 cycles at 5 A g⁻¹ and achieves a high rate performance of 100.01 mAh g⁻¹ at 20 A g⁻¹. This impressive electrochemical performance is attributed to the reaction, which provides more Mn²⁺ storage sites and generates highly conductive Ag within the electrode. This study presents a novel approach to achieving high-capacity AMIBs.