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-...

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Bibliographic Details
Published inElectrochemistry communications Vol. 9; no. 6; pp. 1305 - 1310
Main Authors Arroyo y de Dompablo, M.E., Gallardo-Amores, J.M., Amador, U., Morán, E.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2007
Subjects
Electrode material
High pressure
Lithium batteries
Lithium intercalation
V 2O 5
V 2O 5
Lithium batteries
Electrode material
Lithium intercalation
High pressure
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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