Abstract
Electroactive materials with low crystallization are particularly promising for energy storage owing to additional grain boundaries and ion diffusion channels, but their applications are limited by the consensus that crystalline samples have higher stability in most applications. Here, we developed a solvothermal method for synthesizing low-crystallized nickel-cobalt hydroxide (NiCo−OH−L) using N-methylpyrrolidone and water-mixed solvents. For nickel-zinc battery (NZB) applications, the NiCo−OH−L was found to have comparable cycling stability to its high-crystallized counterpart. However, it showed an increased capacity and capacity retention in the current region of 1–50 A g−1. The superior performance was due to the low-crystallized structure, which has a large specific surface area and reduced charge transfer resistance. Furthermore, the cobalt constitution in the NiCo−OH−L improves its rate performance and cycling stability. As a result, the NiCo−OH−L had a capacity of 238.9 mA h g−1 at 1 A g−1 and maintained 116.4 mA h g−1 at 50 A g−1, indicating both high-capacity and high-rate performances. More significantly, the NiCo−OH−L-assembled NZB exhibited consistent performance under different currents and cycling cycles.
摘要
因具有大量的晶界和离子扩散通道, 低结晶度的电极活性材料有望在储能领域中实现更好的性能. 然而在大多数应用中通常是结晶良好的样品具有更好的稳定性, 稳定性较差限制了低结晶样品在相关研究领域的应用. 本文利用一种溶剂热法调控N-甲基吡咯烷酮和水混合溶剂的体积比以合成低结晶度的镍钴氢氧化物(NiCo−OH−L). 研究发现, 将合成的镍钴氢氧化物用作镍-锌电池正极时, NiCo−OH−L不仅表现出与高结晶度的同类样品相当的循环稳定性能, 而且在1–50 A g−1的电流范围内显示出更高的容量以及容量保持率. 其优异的电化学性能可归因于低结晶的结构, 显著提高的比表面积和降低的电荷转移电阻. 此外, NiCo−OH−L的钴组分进一步提高了倍率和循环稳定性能.NiCo−OH−L在1 A g−1时的比容量达到238.9 mA h g−1, 当电流密度升至50 A g−1时的容量仍有116.4 mA h g−1, 显示出高容量和高倍率性能. 不仅如此, 由NiCo−OH−L组装成的镍-锌电池在不同的电流和循环周期下也表现出较高的性能.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (21905148).
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Yang C and Chen HC conceived the idea and wrote the manuscript; Yang C, Peng Z, Zhao Q, Liu R, Yun S and Zhang Z performed the experiments. Fan M helped with the paper revision. Cao H helped with the theoretical calculation.
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The authors declare that they have no conflict of interest.
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Experimental data and supporting data are available in the online version of the paper.
Chun Yang received his BE degree in 2019 from North China University of Science and Technology. He is a master candidate at Qingdao University, China. His research interests mainly focus on zinc-based batteries and zinc-based hybrid capacitors.
Hai-Chao Chen is currently an associate professor at the Institute of Materials for Energy and Environment/School of Materials Science and Engineering, Qingdao University. Prior to holding this position, he performed research on the preparation of high-performance active materials for supercapacitors at Huazhong University of Science and Technology, China. Now his main research interest focuses on the advanced electroactive materials for hybrid supercapacitors and Zn-ion batteries.
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Yang, C., Peng, Z., Zhao, Q. et al. Reducing nickel-cobalt hydroxide crystallization for optimal nickel-zinc battery performance. Sci. China Mater. 66, 97–105 (2023). https://doi.org/10.1007/s40843-022-2133-3
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DOI: https://doi.org/10.1007/s40843-022-2133-3