Are high pressure materials suitable for electrochemical applications? HP-V 2O 5 as a novel electrode material for Li batteries
Under high pressure (40 kbar) V 2O 5 transforms into a layered polymorph, HP-V 2O 5, consisting of V 5+O 6 octahedra instead of V 5 + O 5 − square pyramids. HP-V 2O 5 reversibly intercalates up to 2 lithium ions down to 1 V vs. Li. The typical discharge/charge voltage–composition curve shows a step-...
Saved in:
Published in | Electrochemistry communications Vol. 9; no. 6; pp. 1305 - 1310 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
2007
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Under high pressure (40
kbar) V
2O
5 transforms into a layered polymorph, HP-V
2O
5, consisting of V
5+O
6 octahedra instead of
V
5
+
O
5
−
square pyramids. HP-V
2O
5 reversibly intercalates up to 2 lithium ions down to 1
V vs. Li. The typical discharge/charge voltage–composition curve shows a step-like profile where six new Li
x
HP-V
2O
5 phases are detected. The specific capacity retention with cycling of HP-V
2O
5∥Li cells (250
Ah/Kg at a C/3.5 rate) is comparable to that of the ambient pressure polymorph. To our knowledge, HP-V
2O
5 is the first example of a high pressure material displaying such a good electrochemical performance. |
---|---|
ISSN: | 1388-2481 1873-1902 |
DOI: | 10.1016/j.elecom.2007.01.035 |