聚苯胺
钒
阴极
材料科学
化学工程
水溶液
电化学
涂层
钒酸盐
电导率
无机化学
纳米技术
化学
电极
复合材料
冶金
聚合物
有机化学
物理化学
工程类
聚合
作者
Mengmeng Ni,Mulan Qin,Hong Chang,Xueru Shi,Bingying Pei,Shuquan Liang,Xinxin Cao
标识
DOI:10.1002/cssc.202400526
摘要
Layered vanadium‐based oxides have emerged as highly promising candidates for aqueous zinc‐ion batteries (AZIBs) due to their open‐framework layer structure and high theoretical capacity among the diverse cathode materials investigated. However, the susceptibility to structural collapse during charge‐discharge cycling severely hampers their advancement. Herein, we propose an effective strategy to enhance the cycling stability of vanadium oxides. Initially, the structural integrity of the host material is significantly reinforced by incorporating bi‐cations Na+ and NH4+ as "pillars" between the V2O5 layers (NaNVO). Subsequently, surface coating with polyaniline (PA) is employed to further improve the conductivity of the active material. As anticipated, the assembled Zn//NaNVO@PA cell exhibits a remarkable discharge capacity of 492 mAh g–1 at 0.1 A g–1 and exceptional capacity retention up to 89.2% after 1000 cycles at a current density of 5 A g–1. Moreover, a series of in‐situ and ex‐situ characterization techniques were utilized to investigate both Zn ions insertion/extraction storage mechanism and the contribution of polyaniline protonation process towards enhancing capacity.
科研通智能强力驱动
Strongly Powered by AbleSci AI