The peculiar structural behaviour of β-Na0.33V2O5 upon electrochemical lithium insertion

A new chemical route for the synthesis of β′-Li V2O5 for use as a high performance cathode

“…Based on the current ex situ XRD data, it could be suggested that the main framework of the ␤ -Li x V 2 O 5 structure may slightly change when the Li is electrochemically intercalated into its internal structure. A recent study of the ␤-Na 0.33 V 2 O 5 (having a similar structure to ␤ -Li x V 2 O 5 ) also reported [31] that although the abrupt voltage steps were observed when the cell is cycled, the structure of the Li x ␤-Na 0.33 V 2 O 5 rarely changed during the electrochemical Li intercalation into the three types of Li sites in its structure when 0.0 ≤ x ≤ 1.66. During the charging of the cell, the main XRD peaks indexed to the ␤ -Li x V 2 O 5 phase are recovered, as shown in Fig.…”

Hydrothermal synthesis of sodium vanadate nanobelts as high-performance cathode materials for lithium batteries

“…HR-TEM image (Fig. 2d) shows an obvious interplanar spacing of d ¼ 7.14 Å, corresponding to the (200) of previously reported b-AgVO 3 [44] and b-Na 0.33 V 2 O 5 [27,30,33,45,46]. The peak at 3.25 V is due to the reduction of sodium from Na þ to Na 0 , the peak at 2.85 V is attributed to the reduction of vanadium from V 5þ to V 4þ , and the peak at 2.43 V is the dominant reduction from V 4þ to V 3þ , the peak at 1.88 V is due to further reduction from V 4þ to V 3þ [44].…”

“…have found that b-Na 0.33 V 2 O 5 have three well-defined voltage plateaus and no phase transition occurs upon lithium intercalation process [30]. Wang et al reported an ultrathin Na 1.08 V 3 O 8 nanosheets with superior rate capability up to 50 C and good cycling performance as cathode material for LIBs [36].…”

Catalytic behavior of NaV6O15 bronze for partial oxidation of hydrogen sulfide

“…It contains tunnels formed by the VO6 and VO5 complexes along the b axis, whereas the Na ions are located inside the tunnels. However, these vanadium atoms occupy three crystallographically different positions [32][33][34]: i) VO6 13 octahedron forming zig-zag chains of edge-shared VO6 octahedra along the b axis; ii) VO6 octahedron forming double chains of angle-shared octahedra, and iii) VO5…”

“…It is well known that the incorporation of alkali metal (Li, Na, K) to vanadium oxides, favors the formation of bronzes of general formula MxV2O5 [31], which depend on the alkali/V ratio [31][32][33][34]: i) α-bronze, isostructural with the orthorhombic V2O5, at very low alkali metal content, i.e. values of x of 0.13 (Li), 0.02 (Na) or 0.006 (K); and ii) β-bronze at higher concentration of Li (0.22 < x < 0.62) or Na (0.22 < x < 0.40).…”