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Novel Mg7V4O16(OH)2·H2O and Mg3(VO4)2: preparation, characterization, and performance as lithium-ion anode materials
Mg 7 V 4 O 16 (OH) 2 ·H 2 O was prepared by improving the hydrothermal conditions and Mg 3 (VO 4 ) 2 was obtained by heat treatment of Mg 7 V 4 O 16 (OH) 2 ·H 2 O at 700 °C. XRD shows a phase transition from a hexagonal structure to an orthogonal structure, which is confirmed by the HRTEM results. M...
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Published in: | Journal of materials science. Materials in electronics 2020-11, Vol.31 (22), p.19931-19942 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Mg
7
V
4
O
16
(OH)
2
·H
2
O was prepared by improving the hydrothermal conditions and Mg
3
(VO
4
)
2
was obtained by heat treatment of Mg
7
V
4
O
16
(OH)
2
·H
2
O at 700 °C. XRD shows a phase transition from a hexagonal structure to an orthogonal structure, which is confirmed by the HRTEM results. Mg
3
(VO
4
)
2
keeps overall pencil-shaped SEM morphology with Mg
7
V
4
O
16
(OH)
2
·H
2
O but shows a lot of spaces due to the loss of hydroxyl groups and crystal water in the structure during heat treatment. Mg
3
(VO
4
)
2
enjoys a narrower band gap in comparison with Mg
7
V
4
O
16
(OH)
2
·H
2
O. The space in Mg
3
(VO
4
)
2
microstructure and its narrower band gap improve the transmission efficiency of Li
+
, reaching a stabile capacity of 151 mAh/g after cycling 100 times at a current density of 100 mA/g. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-020-04516-y |