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Fig. 6 a TEM images of Na 4 Mn 9 O 18 nanowires calcined at 750 C. b Cycle performance of
Na 4 Mn 9 O 18 samples calcined at 600, 750, and 900 C at a current density of 60 mA g -1
(0.5C)
[ 4 ]
Fig. 7 The charge/discharge
profile (a) and cycle
performance (b) of the
Na 4 Mn 9 O 18 /pyrolyzed carbon
Na-ion battery in the
potential range of 1.5-4.1 V
from the second cycle at a
constant current of
50 mA g -1
(~0.5 C) [ 4 ]
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