Abstract
Hexagonal porous Nb2O5 was synthesized for the first time via a facile solid-state reaction. The structure and electrochemical properties have been optimized through tuning heating temperature. X-ray diffraction results indicate that pseudo hexagonal Nb2O5 (TT-Nb2O5) and orthorhombic Nb2O5 have been synthesized at different temperatures. Hexagonal sheet and porous structure of Nb2O5 were characterized by scanning electron microscopy and N2-adsorption-desorption isotherms. The as-prepared TT-Nb2O5 (heated at 600 °C) shows the best performance with a remarkable charge capacity of 178 mA·h/g at 0.2C, which is higher than that of T-Nb2O5. Even at 20C, TT-Nb2O5 offers unprecedented rate capability up to 86 mA·h/g. The high rate capacity is due to pseudocapacitive Li+ intercalation mechanism of TT-Nb2O5. The reported results demonstrate that Nb2O5 with good crystal structure and high specific surface area is a powerful composite design for high-rate and safe anode materials.
摘要
本文通过固相反应首次合成了一种六方多孔 Nb2O5 材料. 通过优化热处理温度调节 Nb2O5 材料的结构和电化学性能. XRD 结果表明, 在不同温度下可以合成伪六方晶系与正交晶系 Nb2O5; SEM 结果表明, 所合成的 Nb2O5 材料具有正六边形貌与多孔结构. 将该材料用作锂离子电池负极材料时, 在 600 °C制备的伪六方结构 Nb2O5(TT-Nb2O5)表现出最优的电化学性能. 0.2C 电流密度下, 其可逆比容量为 178 mA·h/g; 当电流密度提高到 20C 时, 可逆比容量仍有 86 mA·h/g. 优异的电化学性能得益于 Nb2O5 的赝电容式锂离子嵌入机制, 通过晶体结构与比表面积调控显著提高 Nb2O5 的综合电化学性能.
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LIU Yun-jian provided the concept and edited the draft of manuscript. ZHOU Yu conducted the literature review, and wrote the first draft of the manuscript, and replied to reviewers’ comments. LIU Ke, ZHOU Yue and NI Jia-hua provided the measured dataand analyzed the measured data. DOU Ai-chun and SU Ming-ru provided resources and validation. All authors revised the final version.
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ZHOU Yu, LIU Ke, ZHOU Yue, NI Jia-hua, DOU Ai-chun, SU Ming-ru, LIU Yun-jian declare that they have no conflict of interest.
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Foundation item: Projects(51974137, 51774150) supported by the National Natural Science Foundation of China; Project(2020M671361) supported by China Postdoctoral Science Foundation
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Zhou, Y., Liu, K., Zhou, Y. et al. Synthesis of a novel hexagonal porous TT-Nb2O5 via solid state reaction for high-performance lithium ion battery anodes. J. Cent. South Univ. 27, 3625–3636 (2020). https://doi.org/10.1007/s11771-020-4570-0
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DOI: https://doi.org/10.1007/s11771-020-4570-0