Tuning the layer structure of molybdenum trioxide towards high-performance aqueous zinc-ion batteries

Aqueous zinc-ion batteries(ZIBs)have attracted significant attentions because of low cost and high reli-ability.However,conventional ZIBs are severely limited by the development of high energy density cath-ode materials with reversible Zn2+insertion/extraction.Herein,a conducting polymer intercalated MoO3(PMO)with extensively extended interlayer spacing is developed as a high-performance ZIBs cathode material.The interlayer spacing of PMO is prominently increased which results in an improved Zn2+mo-bility during charge and discharge process.More significantly,the electrochemical results reveals that the intercalation of PANI facilitates the charge storage and reinforces the layered structure of MoO3,leading to a high capacity and good cycling stability.DFT calculation further reveals the intercalation of PANI into MoO3 significantly lower Zn2+diffusion barrier.Benefit from these advantages,the ZIBs based on PMO electrode delivers a considerable capacity of 157 mAh/g at 0.5 A/g and ameliorative stability with 63.4％capacity retention after 1000 cycles.