V2O5 aerogel (ARG) has been recently proposed as cathode material for rechargeable lithium batteries. Such a material is amorphous and consists of a highly interconnected solid network with a surface area up to 450 m2/g, and a specific pore volume as much as 2.3 cm3/g. In a previous paper, it was shown that up to 4 equivalents of lithium per mole of V2O5 aerogel can be inserted by means of chemical or electrochemical lithiation. In the present work, the lithium composition range has been extended. By chemical lithiation (CL) a composition Li5.8V2O5, the highest ever reported for any vanadium oxide host, was achieved. The equilibrium open circuit voltage (OCV)-composition curve of the chemically lithiated aerogel samples showed a wide plateau extending up to 5.8 equivalents of lithium per mole of V2O5. The surprisingly high OCV has been correlated with the characteristic morphology and structure of the aerogel material by means of X-ray diffraction and absorption and XPS spectroscopies.
Bibliographical noteFunding Information:
The study was supported by Advanced Research Project Agency (ARPA)/University Research Initiative, Contract N/N00014-92-J-1875. Measurements at LURE were supported by the EEC TMR program (LURE project number PS 068-96).
- Lithium intercalation
- Vanadium pentoxide