材料科学
化学工程
氧化钒
静电纺丝
钒
电化学
阴极
溶解
碳纤维
纳米技术
碳纳米纤维
水溶液
纳米纤维
复合数
电极
复合材料
冶金
碳纳米管
化学
物理化学
工程类
聚合物
作者
Yunfei Song,Laiying Jing,Rutian Wang,Jiaxi Cui,Mei Li,Yunqiang Zhang
标识
DOI:10.1016/j.jechem.2023.10.013
摘要
Vanadium-based electrodes are regarded as attractive cathode materials in aqueous zinc ion batteries (ZIBs) caused by their high capacity and unique layered structure. However, it is extremely challenging to acquire high electrochemical performance owing to the limited electronic conductivity, sluggish ion kinetics, and severe volume expansion during the insertion/extraction process of Zn2+. Herein, a series of V2O3 nanospheres embedded N-doped carbon nanofiber structures with various V2O3 spherical morphologies (solid, core–shell, hollow) have been designed for the first time by an electrospinning technique followed thermal treatments. The N-doped carbon nanofibers not only improve the electrical conductivity and the structural stability, but also provides encapsulating shells to prevent the vanadium dissolution and aggregation of V2O3 particles. Furthermore, the varied morphological structures of V2O3 with abundant oxygen vacancies can alleviate the volume change and increase the Zn2+ pathway. Besides, the phase transition between V2O3 and ZnXV2O5−m·nH2O in the cycling was also certified. As a result, the as-obtained composite delivers excellent long-term cycle stability and enhanced rate performance for coin cells, which is also confirmed through density functional theory (DFT) calculations. Even assembled into flexible ZIBs, the sample still exhibits superior electrochemical performance, which may afford new design concept for flexible cathode materials of ZIBs.
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