Coaxial α-MnSe@N-doped carbon double nanotubes as superior anode materials in Li/Na-ion half/full batteries

Coaxial nanotubes are a significant class of nanoscale building blocks for advanced electrodes of secondary batteries. Herein, one-dimensional (1D) coaxial double nanotubes (DNTs) consisting of α-MnSe inner tubes and N-doped carbon (N-C) outer tubes (abbreviated as α-MnSe@N-C DNTs) are successfully...

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Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (32), p.15797-1586
Hauptverfasser: Liu, Dai-Huo, Li, Wen-Hao, Liang, Hao-Jie, Lü, Hong-Yan, Guo, Jin-Zhi, Wang, Jiawei, Wu, Xing-Long
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Sprache:eng
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Zusammenfassung:Coaxial nanotubes are a significant class of nanoscale building blocks for advanced electrodes of secondary batteries. Herein, one-dimensional (1D) coaxial double nanotubes (DNTs) consisting of α-MnSe inner tubes and N-doped carbon (N-C) outer tubes (abbreviated as α-MnSe@N-C DNTs) are successfully prepared and are demonstrated to be promising anode material for Li-ion and Na-ion batteries (LIBs/NIBs). When used in LIBs, it was revealed by ex situ XRD/HRTEM studies and electrode kinetics that a new electrochemical α → β phase transition plays a crucial role in improving the cycling stability. As a result, the α-MnSe@N-C DNTs electrode delivers a high Li-storage capacity (800 mA h g −1 at 50 mA g −1 ), excellent rate capability (405 mA h g −1 at 14 A g −1 ) and ultra-long cycling stability (a high capacity retention of 87.2% even after 9000 cycles at 2 A g −1 ) with retained 1D morphology. In addition, the outer N-C nanotube can effectively protect the active α-MnSe inner nanotube to realize such outstanding electrochemical properties owing to the high electrical conductivity and particular 1D coaxial nanoarchitecture of the inner nanotube. Moreover, α-MnSe@N-C DNTs also exhibit excellent Li/Na-storage properties and full-cell performances when coupled with commercial LiFePO 4 and LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathodes in LIBs as well as with the Na 3 V 2 (PO 4 ) 2 O 2 F cathode in NIBs. One-dimensional coaxial double nanotubes consisting of α-MnSe inner tubes and N-doped carbon outer tubes were prepared as anode materials for Li-ion and Na-ion batteries.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta03967d