【摘要】 中空结构的V₂O₅材料由于在锂离子嵌入和循环稳定性方面有明显优势,获得了科研人员的特别关注。然而通过简易方法来制备均匀且具有复杂内部结构的V₂O₅中空微米球仍面临挑战。本文首次利用V₂O₅、H₂C₂O₄·2H₂O、H₂O和正丁醇进行溶剂热反应,得到蛋黄结构前躯体,然后将前躯体于空气中烧结,获得均匀的多层V₂O₅核壳结构微米球。采用X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）及电化学测试等手段对其进行表征和测试。V₂O₅核壳结构微米球用作锂离子电池正极材料时,在2.5⁴ V电压区间、200 mA/g电流密度条件下放电比容量高达122 m Ah/g,循环200圈后容量保持率高达95.9%。该材料优异的电化学性能主要由于结合了低维和三维纳米结构。更多还原

【Abstract】 Hollow-structured V₂O₅ materials have drawn special interests because of their advantageous for facile Li+ ion insertion and good cycling stability. However, the controllable fabrication of V₂O₅ hollow structures with high uniformity and complex internal structure through simple synthesis procedures still remains challenging. In this study, the uniform multi-shelled core-shelled V₂O₅ microspheres were fabricated by one-step solvothermal treatment using commercial V₂O₅, H₂C₂O₄·2 H₂O, H₂O and N-butanol as raw materials followed by subsequent annealing for the first time. X-ray diffraction（XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and electrochemical measurements were used to characterize the properties of the materials. Used as cathode materials for lithium-ion batteries, the core-shelled V₂O₅ microspheres exhibit a high specific discharge capacity of 122 m Ah/g at 200 m A/g within a voltage range of 2.5-4 V, with a corresponding capacity retention of 95.9% after 200 cycles. The good electrochemical property of the V₂O₅ microspheres might be related to the unique core-shelled structure which combines the advantages of both low-dimensional and three-dimensional nanostructures.更多还原