Abstract
The enhancement of energy density and cycling stability is in urgent need for the widespread applications of aqueous rechargeable Ni-Zn batteries. Herein, a facile strategy has been employed to construct hierarchical Co-doped Ni-MoO4 nanosheets as the cathode for high-performance Ni-Zn battery. Benefiting from the merits of substantially improved electrical conductivity and increased concentration of oxygen vacancies, the NiMoO4 with 15% cobalt do** (denoted as CNMO-15) displays the best capacity of 361.4 mA h g−1 at a current density of 3 A g−1 and excellent cycle stability. Moreover, the assembled CNMO-15//Zn battery delivers a satisfactory specific capacity of 270.9 mA h g-1 at 2 A g−1 and a remarkable energy density of 474.1 W h kg−1 at 3.5 kW kg−1, together with a maximum power density of 10.3 kW kg−1 achieved at 118.8 W h kg−1. Noticeably, there is no capacity decay with a 119.8% retention observed after 5000 cycles, demonstrating its outstanding long lifespan. This work might provide valuable inspirations for the fabrication of high performance Ni Zn batteries with superior energy density and impressive stability.
摘要
提高能量密度和循环稳定性对推广水系可充电镍锌电池的 广泛应用至关重要. 我们采用一种简易的合成方法构建了Co掺杂 NiMoO4纳米片, 并将其作为**极材料用于高性能镍锌电池. 得益 于导电性和氧空位浓度的大幅度提升, 钴掺杂量为15%的电极材料 (CNMO-15)表现出突出的比容量及循环稳定性, 在3 A g−1的电流 密度下其容量高达361.4 mA h g−1. 此外, 以CNMO-15为**极组装 的镍锌电池(CNMO-15//Zn)也展现了优异的比容量(在2 A g−1的电 流密度下高达270.9 mA h g−1), 以及高能量密度(在3.5 kW kg−1的 功率密度下高达474.1 W h kg−1)和功率密度(在118.8 W h kg−1的能 量密度下高达10.3 kW kg−1). 值得注意的是, 该电池在循环5000圈 后容量没有损失, 保留了初始容量的119.8%, 表现出优异的循环稳 定性. 本研究可以为未来构建高能量密度和优异循环稳定性的镍 锌电池提供非常有价值的参考.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (51602049), the Fundamental Research Funds for the Central Universities (2232017D-15, GSIF-DH-M-2020002), and China Postdoctoral Science Foundation (2017M610217 and 2018T110322).
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Shen Y and Zhang K performed the experiments and wrote the article. Liu Q, Li Z and Cui Z conducted the characterization and data analysis. Yang F, Zou R, Hu J and Xu K proposed the experimental design. All authors contributed to the general discussion.
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Yuenian Shen is currently a postgraduate student in the College of Materials Science and Engineering, Donghua University. His current interest focuses on the transition metal oxides for electrochemical energy storage and conversion applications.
Qian Liu is currently working at Donghua University. She received her BS degree in physics from Ludong University (2010) and her PhD in material science from Donghua University (2015). Her current research interests are focusing on 1D and 2D nanomaterials’ manipulation, transformations and atomic level understanding of electromechanical, energy conversion and energy storage systems.
Kaibing Xu received his PhD degree from Donghua University in 2015. Currently, he works in the Research Center for Analysis and Measurement at Donghua University. His research focuses on rational design and synthesis of nanocomposite materials for applications in electrochemical energy storage and conversion such as supercapacitors, alkaline rechargeable batteries and lithium ion batteries.
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Shen, Y., Zhang, K., Yang, F. et al. Oxygen vacancies-rich cobalt-doped NiMoO4 nanosheets for high energy density and stable aqueous Ni-Zn battery. Sci. China Mater. 63, 1205–1215 (2020). https://doi.org/10.1007/s40843-020-1292-6
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DOI: https://doi.org/10.1007/s40843-020-1292-6