水热法制备富含氧缺陷的水合二氧化钒电极及其储锌性能

Hydrated Vanadium Dioxide Electrode Rich in Oxygen Defects Prepared by Hydrothermal Method and Its Zinc Storage Performance

为了开发具有循环稳定性的钒基锌离子正极材料,利用五氧化二钒与苯硼酸之间的反应作用,通过简单的一步水热反应制备出富含氧缺陷的水合二氧化钒(VO_(2)·xH_(2)O)。氧缺陷的引入可有效提高电导率,从而促进VO_(2)·xH_(2)O的反应动力学和电化学性能。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外(FTIR)光谱仪和X射线光电子能谱仪(XPS)研究了VO_(2)·xH_(2)O的形貌和结构。电化学测试结果表明,VO_(2)·xH_(2)O作为正极材料组装成的水系锌离子电池表现出优异的储锌性能。在2 A·g^(-1)的电流密度下,VO_(2)·xH_(2)O电极首圈放电比容量为214 mA·h·g^(-1),其在0.5 A·g^(-1)电流密度下循环100圈后放电比容量还能保持215 mA·h·g^(-1)。因此,提供了一种具有高性能的富含氧缺陷的水合二氧化钒电极的高效制备方法,为钒基电极材料商业化开拓了新思路。

To develop cycle-stable vanadium-based zinc-ion cathode materials,the reaction effect between vanadium pentoxide and phenylboronic acid was used to prepare hydrated vanadium dioxide(VO_(2)·xH_(2)O)rich in oxygen defects by a simple one-step hydrothermal reaction.The introduction of oxygen defects can effectively increase the conductivity,thus promoting the reaction kinetics and electrochemical performance of VO_(2)·xH_(2)O.The morphology and structure of VO_(2)·xH_(2)O were studied by scanning electron microscope(SEM),X-ray diffractometer(XRD),Fourier transform infrared(FTIR)spectrometer and X-ray photoelectron spectrometer(XPS).The electrochemical test results show that the aqueous zinc-ion battery assembled with VO_(2)·xH_(2)O as the cathode material exhibits excellent zinc storage performance.The VO_(2)·xH_(2)O electrode has the discharge specific capacity of 214 mA·h·g^(-1)in the first cycle at a current density of 2 A·g^(-1),and can maintain 215 mA·h·g^(-1)after 100 cycles at a current density of 0.5 A·g^(-1).Therefore,an efficient preparation method of vanadium dioxide electrode with high performance and rich in oxygen defects is provided,which opens up a new idea for the commercialization of vanadium-based electrode materials.