Monoclinic MoOx anode material synthesized by a facile N-methylpyrrolidone-assisted wet-chemical method for rechargeable aqueous zinc ion batteries

Recently, although aqueous zinc ion batteries have caused widespread concerns, the pieces of research on new anode materials are still very limited. And herein, monoclinic MoOx anode material with impressive properties for rechargeable aqueous zinc ion batteries is synthesized by a facile N-methylpyrrolidone-assisted wet-chemical method for the first time. The monoclinic MoOx anode material delivers high initial discharge/charge capacities of 233.7/203.7 mAh g(-1) at a current density of 0.5 A g(-1). What is more, even at an extremely high current density of 20 A g(-1), high initial discharge/charge capacities of 173.3/122.2 mAh g(-1) can be still exhibited, and the highest charge capacity of 145.0 mAh g(-1), which corresponds to a discharge capacity of 146.7 mAh g(-1) is delivered at the 8th cycle. Furthermore, the anode material could still work effectively even after 40,000 cycles at 20 A g(-1) that considerable discharge/charge capacities of 38.3/38.3 mAh g(-1) can be still exhibited. The significance of the rational designing the ratio between the cathode material mass and the monoclinic MoOx anode mass is also illustrated here, and it is found the optimized cell (cathode: anode mass ratio of 2:1) exhibits great electrochemical properties enhancement including higher capacity, better rate property, and better cycle ability.

Automated summary

Monoclinic MoOx anode material exhibits impressive properties in rechargeable aqueous zinc ion batteries, including high initial discharge/charge capacities and good cycle ability. The study emphasizes the importance of designing the ratio between cathode and anode material masses in enhancing battery performance.