Mn2+ Intercalation into Hydrated Vanadium Pentoxide Nanosheets for Highly Durable Zinc Ion Batteries

AqueousZn ion batteries are emerging energy storage devices withinexpensive, environmentally benign, and extremely safe characteristics.However, the increase of side reaction limits their further applicationsdue to the lack of suitable cathode materials and water solvent aselectrolytes. Herein, we report a kind of electrode material by insertingMn(2+) into the interlayers of nanosheets. The introductionof Mn ion protects the integral structure during the fully charging-dischargingprocess. In addition, the presence of crystallized water also playsan electrostatic shielding role, which favors the embedding and de-embeddingof zinc ions. The Zn/MVO devices deliver a reversible specific capacityof 394.54 mAh/g at 0.2 A/g and long-term cycle stability.

Automated summary

The researchers reported an electrode material with Mn(2+) inserted into the interlayers of nanosheets, improving the charge-discharge stability and cycle life of aqueous zinc ion batteries.