可控制备VO_(2)/GO复合材料及其在水系锌离子电池中的应用

Controllable Preparation and Application of VO_(2)/GO Composite in Aqueous Zinc-Ion Battery

基于碳中和、低排放以及环保的理念,水系锌离子电池因其高性价比、高安全性和环境友好等优势被广泛开发和应用.本文通过水热法成功制备了纯相的VO_(2),并通过超声分散和冷冻干燥相结合的方法,可控制备了一种VO_(2)/氧化石墨烯(VO_(2)/GO)复合材料.GO的引入不仅有效提高了材料的电子导电性,同时也缓冲了电极材料在循环过程中的体积膨胀,从而显著提高了其倍率和循环性能.VO_(2)/10wt%GO在电流密度为0.2,0.5,1.0,2.0,5.0和0.1 A·g^(-1)时,首次放电比容量分别为434,417,403,361,336和437 mAh·g^(-1),并表现出优异的循环和倍率性能.本文提出的VO_(2)与GO相复合的方法为水系锌离子电池正极材料的制备提供了一种有效的方法.

Based on the concept of carbon neutrality,low emissions and environmental protection,the aqueous zinc-ion battery has been widely developed and applied because of its high cost,high safety and environmental friendliness.In this paper,we successfully prepared the pure VO_(2) by the hydrothermal method,and synthesized a VO_(2)/GO composite by the ultrasonic dispersion combined with the freeze-drying method.The introduction of GO not only effectively improves the electronic conductivity of the material,but also buffers the volume expansion of the electrode material during the cycling process,thus significantly improving its rate and cycling performance.When the current densities are 0.2,0.5,1.0,2.0,5.0 and 0.1 A·g^(-1),the initial specific capacities of the VO_(2)/10%GO samples are 434,417,403,361,336 and 437 mAh·g^(-1),respectively,showing excellent cycling and rate performance.In the paper,the synthesis of the VO_(2)/GO composite provides an effective method for the preparation of cathode materials for the aqueous zinc-ion battery.