At present, the main challenge facing the aqueous zinc ion batteries (ZIBs) system is to find a kind of cathode material with high stability and large capacity. In this study, the precursor of metal-organic framework (MOF) was synthesized by hydrothermal method. Then, the carbon composite vanadyl oxide (N/C@V₂O₃) was synthesized by vacuum heat treatment and used as cathode material for ZIBs. The electrode material underwent an in situ phase change process during the first charge, where the corundum structure of N/C@V₂O₃ was oxidized and transformed into layered basic zinc vanadate (N/C@Zn₂(OH)₃(VO₃)). The layered structure helps to achieve fast and stable storage and transport of zinc ions. Resulting in stable electrochemical performance, high specific capacity up to 285 mAh g⁻¹ (1 A g⁻¹), and ultra-long cycle stability (capacity retention of 98% at 10 A g⁻¹ after 4500 cycles). In situ phase transition takes place inside the battery, which is a simple method to improve the theoretical capacity limit of materials, and has positive significance for realizing large magnification and long cycle ZIBs cathode materials.

目前，水系锌离子电池（ZIBs）体系面临的主要挑战是寻找一种高稳定性、大容量的正极材料。在这项研究中，金属有机框架（MOF）的前体是通过水热法合成的。然后，通过真空热处理合成了碳复合氧化钒(N/C@V ₂ O _{3 )，并将其用作ZIBs的正极材料。}电极材料在第一次充电过程中经历了原位相变过程，其中N/C@V ₂ O ₃的刚玉结构被氧化并转化为层状碱性钒酸锌（N/C@Zn ₂ (OH) ₃ (VO _3个)). 层状结构有助于实现锌离子的快速稳定储存和运输。导致稳定的电化学性能、高达 285 mAh g ⁻¹ (1 A g ⁻¹ ) 的高比容量和超长循环稳定性（4500 次循环后在 10 A g ⁻¹下容量保持率为 98% ）。电池内部发生原位相变，是提高材料理论容量极限的一种简单方法，对实现大倍率、长循环ZIBs正极材料具有积极意义。