Abstract
Li2O2, as the discharge product of Li-O2 batteries on cathode, is difficult to be electrochemically decomposed, which will lead to short cycling lifespan of the batteries. In this study, the cycling lifespan of Li-O2 battery was prolonged significantly by an efficient bifunctional catalyst. The Ni and N co-doped carbon nanotubes (NiNCs) were synthesized firstly, and then RuO2 nanoparticles were deposited on NiNCs by a hydrothermal route to synthesize RuO2/NiNC catalysts. Transmission electron microscopy and X-ray diffraction characterizations demonstrated that part of metallic Ni was converted into NiO and Ni(OH)2 after loading RuO2, and the existence of NiO layer can prevent further oxidation of metallic Ni. The Li-O2 battery with RuO2/NiNC as the cathode catalyst exhibits an overpotential of 0.43 V, which is much lower than the value of 1.03 V measured with the Li-O2 battery using NiNC as the cathode catalyst. At a rate of 200 mA g−1, the Li-O2 battery with the RuO2/NiNC cathode can maintain a reversible capacity of 500 mA h g−1 for 260 cycles, and 117 cycles with a higher reversible capacity of 1000 mA h g−1. The superior property of the RuO2/NiNC bifunctional catalyst could be ascribed to the high activity of RuO2 and the rich carbon nanotube structure of NiNC for deposition and decomposition of Li2O2.
摘要
氧化锂是锂-氧电池的主要放电产物, 其很难电化学分解, 因而导致电池的循环寿命过短. 本文通过有效的双功能催化剂显著提升了锂-氧电池的循环寿命. 首先, 我们合成了镍和氮掺杂的碳纳米管(NiNC), 然后通过水热法在NiNC上负载二氧化钌(RuO2)纳米粒子合成RuO2/NiNC催化剂. 透射电子显微镜和X-射线粉末衍射证明在水热负载RuO2之后部分金属镍被转变成氧化镍和氢氧化镍, 且氧化镍的存在缓解了金属镍的进一步氧化. 以RuO2/NiNC为正极催化剂的锂氧电池的过电压仅为0.43 V, 远低于使用NiNC作为正极催化剂的1.03 V. 当限定充放电条件为200 mA g−1, 500 mA h g−1 时循环寿命可达260次, 在1000 mA h g−1高比容量下的循环寿命也达到117次. RuO2/NiNC催化剂优异的性能归因于RuO2的高活性和NiNC材料丰富的碳纳米管结构促进了放电产物 (Li2O2)的生成和分解.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (21875197).
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Xiang C and Sheng W performed the experiments; Zhang S, Xiang C and Sheng W analyzed the results and wrote the paper; Sun S and Li J directed the project; Zhang P contributed to material synthesis. All authors contributed to the general discussion.
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Chengcheng Xiang received his BSc degree from the College of Chemistry and Environmental Engineering, Wuhan Polytechnic University in 2018. Now as a postgraduate at the College of Chemistry and Chemical Engineering, Xiamen University, his research mainly focuses on the preparation of cathode catalysts for Li-O2 batteries and the protection of lithium metal anodes for Li-O2 batteries.
Juntao Li received his PhD from Xiamen University. Now as a professor at the College of Energy, Xiamen University, his research contents include the preparation of electrode materials for lithium ion battery, investigation of interfacial processes of lithium ion battery, and electrochemical in situ Fourier transform infrared spectroscopy.
Shigang Sun received doctorat d’Etat from University of Paris VI. He is an academician of Chinese Academy of Sciences. His research interests include electrocatalysis, electrochemical interface, spectroelectrochemistry, nanomaterials, and energy electrochemistry (fuel cells, lithium batteries).
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RuO2 nanoparticles supported on Ni and N co-doped carbon nanotubes as an efficient bifunctional electrocatalyst of lithium-oxygen battery
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Xiang, C., Sheng, W., Zhang, P. et al. RuO2 nanoparticles supported on Ni and N co-doped carbon nanotubes as an efficient bifunctional electrocatalyst of lithium-oxygen battery. Sci. China Mater. 64, 2397–2408 (2021). https://doi.org/10.1007/s40843-020-1632-9
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DOI: https://doi.org/10.1007/s40843-020-1632-9