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 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
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. |
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ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/c8ta03967d |