纳米五氧化二钒高效锌离子电池负极材料的制备与性能研究

Preparation and properties performance of nano vanadiumpentoxide high efficiency zinc ion battery negative electrode material

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(V^(5+)、V^(4+)、V^(3+)、V^(2+))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(V_(2)O_(5))具有更大比表面积的纳米片。这种V_(2)O_(5)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V_(2)O_(5)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。

Aqueous zinc ion batteries have attracted much attention due to their advantages of higher energy density,low cost and environmental friendliness.Among the commonly used cathode materials for zinc ion batteries,vanadium-based composites have a promising research prospect due to their multiple valence states(V^(5+),V^(4+),V^(3+),V^(2+))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,nanoparticles with a larger specific surface area than commercial vanadium pentoxide(V_(2)O_(5))were prepared in this study using a simple hydrothermal method.Such V_(2)O_(5) 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 capacity 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 V_(2)O_(5),but also possess higher specific capacity.Based on its simple preparation method and good electrochemical stability,the nanoparticles demonstrate potential applications in negative electrode materials for zinc ion batteries.