Environmental Engineering Reference
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Fig. 16 a TEM images of the Na
3
V
2
(PO
4
)
3
(NVP) particles anchored on the carbon matrix. b
Galvanostatic cycling profiles of NVP/C at different current rates between 2.3 and 3.9 V. c Long
term cycle life and coulombic efficiency for 30,000 cycles at 40 C [
36
]
Fig. 17 Electrochemical performance of Na
3
V
2
(PO
4
)
2
F
3
. a Charge/discharge profile at the first
cycle and thirtieth cycle and b cycle performance under a C/10 rate [
28
]
It was found that Na
2
FeP
2
O
7
was electrochemically active [
29
]. Na
2
FeP
2
O
7
has
a triclinic structure with the space group P1 (Fig.
14
c). In the structure, metal
polyhedra (FeO
6
and FeO
5
) and pyrophosphate (P
2
O
7
) are interconnected with
sharing
corners
that create various channel structures for Na-ion migration.
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