MOF-derived Zn/Co co-doped MnO/C microspheres as cathode and Ti3C2@Zn as anode for aqueous zinc-ion full battery

Mn-based aqueous zinc ion batteries (AZIBs) are promising energy storage devices due to its low cost and high performance. However, Jahn-Teller effect of discharge process and Mn2+ dissolution restricts its practical application. Herein, we report a Zn/Co co-doped MnO/C (ZnCo-MnO/C) derived from metal organic framework (MOF) with high specific capacity and cyclic stability, which benefits from the synergistic effect of Zn/Co ions. The doping of Zn ions improves the low specific capacity of MnO in the initial activation process, and Co ions can effectively inhibit the Jahn-Teller effect of discharge products and enhance the structural stability. The syner-gistic effect of Zn/Co co-doped further enhances the conductivity and ion diffusion rate of MnO. In addition, the interface protection layer of the zinc anode is constructed by Ti3C2Cl2 (Ti3C2@Zn), which can effectively inhibit dendrite growth and further improve the cycle life of AZIBs. Specifically, the assembled ZnCo-MnO/C// Ti3C2@Zn full battery has a specific capacity of 428.9 mAh center dot g- 1 at 0.1 A center dot g-1. With 3000 cycles at 3.0 A center dot g-1, the capacity retention rate is 98.7 %. This work emphasizes the significance of co-doped on the electronic structure of MOF derived MnO/C for efficient AZIBs.