Electrochemical Controllable Synthesis of MnO2 as Cathode of Rechargeable Zinc-ion Battery

MnO2 has been considered as an ideal cathode for rechargeable zinc-ion battery due to its high theoretical capacity and low cost. Its electrochemical performance is strongly dependent on the crystal structure and morphology. In this work, MnO2 films are electrochemically synthesized through anodic electrodepositing at different temperatures. Their morphology evolves from nanofibers assembled pompons to nanosheet arrays upon increasing electrodepositing temperature. When evaluated as cathode of rechargeable zinc-ion battery, the MnO2 film electrode electrodeposited at 10 degrees C displays the best electrochemical performance due to this it shows the best morphology and electrode/electrolyte interphase stability. It can stably cycle over 1000 cycles and remains a high capacity of 102 mAh g(-1) at 1.8 A g(-1), and a capacity of 80 mAh g(-1) at high current density of 4.5 A g(-1). This work provides a new direction to prepare MnO2 electrode with stable electrochemical cyclability.