Freestanding H2V3O8/MXene films for high performance quasi-solid-state zinc-ion batteries

In this study, freestanding H2V3O8/MXene (HVO/MX) film were synthesized by high temperature mixing hydrothermal method and coating method. The composite film exhibits good electrical conductivity and flexibility. In addition, HVO/MX film shows excellent electrochemical properties when used as cathode material for aqueous zinc ion batteries (ZIBs) and solid-state ZIBs. The aqueous ZIBs assembled from the HVO/MX film shows satisfactory specific capacity (highest specific capacity can reach 346 mAh/g at 10 A/g) and cycling performance. Surprisingly, the assembled quasi-solid-state batteries can work well at room temperature and low temperature conditions. The battery maintained a high discharge specific capacity of 180 mAh/g after 3000 cycles at 25 degrees C. The outstanding performance of the HVO/MX film assembled battery is due to its good electrical conductivity, zinc-ion diffusion rate and simple battery structure. This work provides a novel route for the preparation of self-supporting cathode materials for different battery system.

Automated summary

Freestanding H2V3O8/MXene film with good electrical conductivity and flexibility was synthesized using high temperature mixing hydrothermal method and coating method. The film exhibited excellent electrochemical properties when used as cathode material for aqueous zinc ion batteries and solid-state zinc ion batteries.