Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 31, 2015
Previous Article Next Article

Improving the energy density of Na3V2(PO4)3-based positive electrodes through V/Al substitution

Author affiliations

Abstract

The crystal chemistry and the electrochemical properties upon Na+ extraction/insertion of NASICON-type Na3AlyV2−y(PO4)3 compositions (y = 0.1, 0.25 and 0.5) were investigated. It was found that this family of V/Al substituted NASICON materials undergoes multiple reversible phase transitions between −50 °C and 250 °C upon heating, from monoclinic to rhombohedral symmetry, related to progressive disordering of Na+ ions within the framework. Na+ insertion/extraction mechanisms were monitored by operando X-ray diffraction. It is shown for the first time that substitution of aluminum for vanadium in Na3Al0.5V1.5(PO4)3 increases significantly the theoretical energy density of these promising positive electrodes (425 W h kg−1) due to its lighter molecular weight and the possibility of reversible operation on the V4+/V5+ redox couple at 3.95 V vs. Na+/Na.

Graphical abstract: Improving the energy density of Na3V2(PO4)3-based positive electrodes through V/Al substitution

Back to tab navigation

Supplementary files

Article information


Submitted
13 May 2015
Accepted
28 Jun 2015
First published
30 Jun 2015

J. Mater. Chem. A, 2015,3, 16198-16205
Article type
Paper
Author version available

Improving the energy density of Na3V2(PO4)3-based positive electrodes through V/Al substitution

F. Lalère, V. Seznec, M. Courty, R. David, J. N. Chotard and C. Masquelier, J. Mater. Chem. A, 2015, 3, 16198
DOI: 10.1039/C5TA03528G

Social activity

Search articles by author

Spotlight

Advertisements