Construction of a Flexible Nb2O5/Carboxyl Multiwalled Carbon Nanotube Film as Anode for Lithium and Sodium Storages
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Zhang, H
Zhan, Z
Li, Y
Ling, M
Gao, X
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Abstract
Considering that Nb2O5 has good safety performance, high capacity, and rich redox couples (Nb5+/Nb4+ and Nb4+/Nb3+), it can be considered as a prospective anode material. However, the inherent poor conductivity of Nb2O5 and the structural damage caused by pulverization hinder their applications. Herein, we designed a flexible Nb2O5/carbon nanotube film (NCNTF) using Nb2O5-decorated carboxyl carbon nanotubes through a facile hydrothermal treatment and vacuum filtration process. Benefiting from its unique structural characteristics, the flexible composite film not only shortens the ions/electrons transmission paths, enhances conductivity, and structural stability but also relieves the large volume changes of Nb2O5 nanoparticles caused by Na+/Li+ insertion/extraction during charging and discharging. The binder-free NCNTF also has excellent electrochemistry storage performance based on simplifying the electrode preparation process. As for lithium-ion batteries, the NCNTF electrode delivers a specific capacity of 382 mAh g–1 after 100 cycles at 0.1 A g–1, and even at 1.0 A g–1, the capacity of 290 mAh g–1 can still be obtained. As for sodium-ion batteries, the NCNTF electrode shows a capacity of 220 mAh g–1 over the same number of cycles as above at 0.1 A g–1.
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ACS Applied Energy Materials
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The authors retract this Article due to inappropriate data manipulation of XPS spectra in Figure 3d–f and the confusion of data usage, leading to unreliability in Figures 4c,g and 5c,e. These issues reduce our full confidence in the performance of the material reported in the study, and we therefore retract the Article.
The original Article was published on November 18, 2020, and retracted on October 14, 2021.
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Kang, J; Zhang, H; Zhan, Z; Li, Y; Ling, M; Gao, X, Construction of a Flexible Nb2O5/Carboxyl Multiwalled Carbon Nanotube Film as Anode for Lithium and Sodium Storages, ACS Applied Energy Materials, 2020