Fluorine-induced dual defects in NiP2 anode with robust sodium storage performance
Metal phosphides have shown great application potential as anode for sodium-ion batteries (NIBs) owing to high theoretical capacity, suitable operation voltage and abundant resource. Unfortunately, the application of NiP 2 anode is severely impeded by low practical capacity and fast capacity decay d...
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Published in | Nano research Vol. 15; no. 3; pp. 2147 - 2156 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Beijing
Tsinghua University Press
01.03.2022
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Metal phosphides have shown great application potential as anode for sodium-ion batteries (NIBs) owing to high theoretical capacity, suitable operation voltage and abundant resource. Unfortunately, the application of NiP
2
anode is severely impeded by low practical capacity and fast capacity decay due to the huge volume variation and low reactivity of internal phosphorus (P) component towards Na
+
. Herein, electronic structure modulation of NiP
2
via heteroatoms doping and introducing vacancies defects to enhance Na
+
adsorption sites and diffusion kinetics is successfully attempted. The as-synthesized three-dimensional (3D) bicontinuous carbon matrix decorated with well-dispersed fluorine (F)-doped NiP
2
nanoparticles (F-NiP
2
@carbon nanosheets) delivers a high reversible capacity (585 mAh·g
-1
at 0.1 A·g
-1
) and excellent long cycling stability (244 mAh·g
-1
over 1,000 cycles at 2 A·g
-1
) when tested as anode in NIBs. Density functional theory (DFT) calculations reveal that F doping in NiP
2
induces the formation of P vacancies with increased Na
+
adsorption energy and accelerates the alloying of internal P component. The F-NiP
2
@carbon nanosheets//Na
3
V
2
(PO
4
)
3
full cell is evaluated showing stable long cycling life. The heteroatoms doping-induced dual defects strategy opens up a new way of metal phosphides for sodium storage. |
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ISSN: | 1998-0124 1998-0000 |
DOI: | 10.1007/s12274-021-3852-7 |