Pre-doped cations in V_(2)O_(5) for high-performance Zn-ion batteries  

作　　者：Yinan Lu Tianlei Wang Nibagani Naresh Joanna Borowiec Ivan P.Parkin Buddha Deka Boruah 

机构地区：[1]Institute for Materials Discovery,University College London,London WC1E 7JE,UK [2]Department of Chemistry,University College London,London WC1H 0AJ,UK

出　　处：《Nano Research Energy》2024年第4期34-42,共9页纳米能源研究(英文)

摘　　要：Aqueous rechargeable zinc-ion batteries(ZIBs)have garnered considerable attention due to their safety,cost-effectiveness,and eco-friendliness.There is a growing interest in finding suitable cathode materials for ZIBs.Layered vanadium oxide has emerged as a promising option due to its ability to store zinc ions with high capacity.However,the advancement of high-performance ZIBs encounters obstacles such as sluggish diffusion of zinc ions resulting from the high energy barrier between V_(2)O_(5) layers,degradation of electrode structure over time and consequently lower capacity Na+K+NH+4than the theoretical value.In this study,we investigated the pre-doping of different cations(including,,and)into V_(2)O_(5) to enhance the overall charge storage performance.Our findings indicate that the presence of V4+enhances the NH+4charge storage performance,while the introduction of into V_(2)O_(5) (NH_(4)-V_(2)O_(5) )not only increases the interlayer distance(d(001)=15.99Å),but also significantly increases the V4+/V5+redox couple(atomic concentration ratio increased from 0.14 to 1.08),resulting in the highest electrochemical performance.The NH_(4)-V_(2)O_(5) cathode exhibited a high specific capacity(310.8 mAh·g^(-1) at 100 mA·g^(-1)),improved cycling stability,and a significantly reduced charge transfer resistance(~17.9Ω)compared to pristine V_(2)O_(5) (112.5 mAh·g^(-1) at 0.1 A·g^(-1) and~65.58Ωcharge transfer resistance).This study enhances our understanding and contributes to the development of high-capacity cathode materials,offering valuable insights for the design and optimization of cathode materials to enhance the electrochemical performance of ZIBs.

关 键 词：pre-doped cations strategy layered vanadium pentoxide tuning oxidation states of vanadium high-charge storage 

分 类 号：TM9[电气工程—电力电子与电力传动]