水系锌离子电池因其能量密度较高、成本低廉且环保等优点而备受关注.在目前常用的锌离子电池负极材料中,钒基复合材料由于其多种价态(V5+、V4+、V3+、V2+)和不同的结构特点,在扮演锌离子电池阴极材料时具备较高的比容量,因此具有广阔的研究前景.然而,钒基复合材料由于循环稳定性差和较低的导电率,在锌离子电池的应用中受到限制.为了解决这一问题,研究采用了简单的水热法制备了比商用五氧化二钒(V2O5)具有更大比表面积的纳米片.这种V2O5纳米颗粒作为锌离子电池的阴极材料,在较低电流密度下,其可提供364 mAh g-1的优异比容量,在高电流密度下表现出156 mAh g-1的高可逆比容量.经过200次循环后,其容量仍能保持初始容量的85％,不仅提供了比商用V2O5更好的循环稳定性,还具备较高的比容量.基于其制备方法简单并具有良好的电化学稳定性,该纳米颗粒展示出在锌离子电池负极材料上的应用潜力.
Preparation and properties performance of nano vanadium pentoxide high efficiency zinc ion battery negative electrode material
Aqueous zinc ion batteries have attracted much attention due to their advantages of higher energy den-sity,low cost and environmental friendliness.Among the commonly used cathode materials for zinc ion batter-ies,vanadium-based composites have a promising research prospect due to their multiple valence states(V5+,V4+,V3+,V2+)and different structural features,which provide high specific capacity when playing the role of cathode materials for zinc ion batteries.However,vanadium-based composites are limited in the application of zinc-ion batteries due to poor cycling stability and low electrical conductivity.To address this issue,nanoparti-cles with a larger specific surface area than commercial vanadium pentoxide(V2O5)were prepared in this study using a simple hydrothermal method.Such V2O5 nanoparticles as cathode materials for zinc ion batteries provide an excellent specific capacity of 364 mAh/g at lower current densities and exhibits a high reversible specific ca-pacity of 156 mAh/g at high current densities.After 200 cycles,its capacity can still maintain 85％of the initial capacity,not only provide better cycling stability than commercial V2O5,but also possess higher specific capac-ity.Based on its simple preparation method and good electrochemical stability,the nanoparticles demonstrate potential applications in negative electrode materials for zinc ion batteries.
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