电化学
水溶液
纳米棒
阴极
离子
化学工程
材料科学
动力学
无机化学
钒
化学
纳米技术
电极
物理化学
有机化学
工程类
物理
量子力学
作者
Han Tang,Feiyang Chao,Hongyu Luo,Kesong Yu,Juan Wang,Huibiao Chen,Runmin Jia,Fangyu Xiong,Yuqiang Pi,Ping Luo,Qinyou An
出处
期刊:Chemsuschem
[Wiley]
日期:2023-04-20
卷期号:16 (15)
被引量:12
标识
DOI:10.1002/cssc.202300403
摘要
Aqueous zinc-ion batteries (AZIBs) attract much attention owing to their high safety, environmentally friendliness and low cost. However, the unsatisfactory performance of cathode materials is one of the unsolved important factors for their widespread application. Herein, we report NH4 V4 O10 nanorods with Mg2+ ion preinsertion (Mg-NHVO) as a high-performance cathode material for AZIBs. The preinserted Mg2+ ions effectively improve the reaction kinetics and structural stability of NH4 V4 O10 (NHVO), which are confirmed by electrochemical analysis and density functional theory calculations. Compared with pristine NHVO, the intrinsic conductivity of Mg-NHVO is improved by 5 times based on the test results of a single nanorod device. Besides, Mg-NHVO could maintain a high specific capacity of 152.3 mAh g-1 after 6000 cycles at the current density of 5 A g-1 , which is larger than that of NHVO (only exhibits a low specific capacity of 30.5 mAh g-1 at the same condition). Moreover, the two-phase crystal structure evolution process of Mg-NHVO in AZIBs is revealed. This work provides a simple and efficient method to improve the electrochemical performance of ammonium vanadates and enhances the understanding about the reaction mechanism of layered vanadium-based materials in AZIBs.
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