Abstract
A fundamental understanding of the electrochemical reaction process and mechanism of electrodes is very crucial for developing high-performance electrode materials. In this study, we report the sodium ion storage behavior and mechanism of orthorhombic V2O5 single-crystalline nanowires in the voltage window of 1.0–4.0 V (vs. Na/Na+). The single-crystalline nanowires exhibit a large irreversible capacity loss during the first discharge/charge cycle, and then show excellent cycling stability in the following cycles. At a current density of 100 mA g−1, the nanowires electrode delivers initial discharge/charge capacity of 217/88 mA h g−1, corresponding to a Coulombic efficiency of only 40.5%; after 100 cycles, the electrode remains a reversible discharge capacity of 78 mA h g−1 with a fading rate of only 0.09% per cycle compared with the 2nd cycle discharge capacity. The sodium ion storage mechanism was investigated, illustrating that the large irreversible capacity loss in the first cycle can be attributed to the initially formed single-crystalline α′-NaxV2O5 (0.02 < x < 0.88), in which sodium ions cannot be electrochemically extracted and the α′-Na0.88V2O5 can reversibly host and release sodium ions via a single-phase (solid solution) reaction, leading to excellent cycling stability. The Na+ diffusion coefficient in α′-NaxV2O5 ranges from 10−12 to 10−11.5 cm2 s−1 as evaluated by galvanostatic intermittent titration technique (GITT).
摘要
深入理解电极的电化学反应过程和机理对高性能电极材料 的设计、开发至关重要. 本文研究了正交相V2O5单晶纳米线在1.0–4.0 V (vs. Na/Na+)电位窗口下的钠离子存储行为和机理. 该单晶纳 米线在首次放电/充电循环中表现出高的不可逆容量损失, 在随后 的循环中表现出良好的循环稳定性. 在100 mA g−1电流密度下, 其 初始放电和充电比容量分别为217和88 mA h g−1, 对应的库伦效率 仅为40.5%. 经过100次循环后, 其可逆放电容量保持在78 mA h g−1, 与第二次放电容量相比其每圈循环衰减率仅为0.09%. 采用循环伏 安(CV)、非原位X-射线衍射(ex-situ XRD)、扫描电镜(SEM)和透 射电镜(TEM)表征, 分析了正交相V2O5单晶纳米线的钠离子存储 机理, 发现V2O5单晶纳米线在首次循环中的高不可逆容量损失主 要是因为其在放电过程中生成了钠离子无法脱出的α′-NaxV2O5 (0.02 < x< 0.88) 单晶相. 该α′-Na0.88V2O5可通过单相(固溶体)反应 可逆地嵌入和脱出钠离子, 因此在后续循环中表现出优异的稳定 性. 采用恒电流间歇电位滴定(GITT)分析发现, α′-NaxV2O5中钠离 子扩散系数值为10−12–10−11.5 cm2 s−1.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (51664012), Guangxi Natural Science Foundation (2017GXNSFAA198117 and 2015GXNSFGA139006), and the Technology Major Project of Guangxi (AA19046001).
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Li Y, Yao J, and Cao G conceived the idea and data analysis. Ji J and Zhang Y performed the experiments. Li Y and Yao J wrote the paper with support from Cao G. Huang B helped to discuss partial experimental data. All authors contributed to the general discussion.
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Yanwei Li is a professor at the College of Chemistry and Bioengineering, Guilin University of Technology. He received his PhD from Harbin Institue of Technology in 2007. His current research interests lie in the design, synthesis, and characterization of advanced materials for Li/Na/Mg-ion batteries.
Jinhuan Yao is a professor at the College of Chemistry and Bioengineering, Guilin University of Technology. She received her PhD in chemical technology from Guangxi University in 2013. Her current research interests focus on the synthesis of metal oxides and their composites for energy storage devices.
Guozhong Cao is a Boeing-Steiner professor of materials science and engineering, professor of chemical engineering and adjunct professor of mechanical engineering at the University of Washington. He is one of Thomson Reuters Highly Cited Researchers and his current research is focused on chemical processing of nanomaterials for solar cells, batteries, and supercapacitors as well as actuators and sensors for aviation and biomedical applications.
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Li, Y., Ji, J., Yao, J. et al. Sodium ion storage performance and mechanism in orthorhombic V2O5 single-crystalline nanowires. Sci. China Mater. 64, 557–570 (2021). https://doi.org/10.1007/s40843-020-1468-6
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DOI: https://doi.org/10.1007/s40843-020-1468-6