A mixed valence V_(4)O_(9)with a tunnel structure and room temperature metallic properties was prepared via partially reducing vanadium pentoxide.Its unique tunnel structure and metallic characteristics are beneficial...A mixed valence V_(4)O_(9)with a tunnel structure and room temperature metallic properties was prepared via partially reducing vanadium pentoxide.Its unique tunnel structure and metallic characteristics are beneficial for fast zinc ion and electron diffusion.A Zn//V_(4)O_(9)battery displays a high rate performance of 234.4 mA h g^(-1)at 50C,a large reversible capacity of 420 mA h g^(-1)at 0.5C,and good cycling stability.The intercalation mechanism of Zn^(2+)and H^(+)is proved by in situ XRD,ex situ XPS,and other characterization techniques,along with density functional theory calculations.This work provides a strategy to improve the electrochemical performance of vanadium oxides through valence regulation.展开更多
基金supported by the National Key R&D Program(2019YFA0705600)the National NSFC(21673243,51771094 and 52001170).
文摘A mixed valence V_(4)O_(9)with a tunnel structure and room temperature metallic properties was prepared via partially reducing vanadium pentoxide.Its unique tunnel structure and metallic characteristics are beneficial for fast zinc ion and electron diffusion.A Zn//V_(4)O_(9)battery displays a high rate performance of 234.4 mA h g^(-1)at 50C,a large reversible capacity of 420 mA h g^(-1)at 0.5C,and good cycling stability.The intercalation mechanism of Zn^(2+)and H^(+)is proved by in situ XRD,ex situ XPS,and other characterization techniques,along with density functional theory calculations.This work provides a strategy to improve the electrochemical performance of vanadium oxides through valence regulation.
