Li/{beta}-VOPO{sub 4}: A new 4 V system for lithium batteries

Journal Article · Wed Dec 01 04:00:00 EST 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1392646· OSTI ID:20013023

Gaubicher, J; Le Mercier, T; Chabre, Y; Angenault, J; Quarton, M

Lithium intercalation into {beta}-VOPO{sub 4} has been performed, both chemically and electrochemically, with X-ray diffraction characterization of the resulting phases at various levels of intercalation-deintercalation. It is shown that intercalation occurs through a first-order transition at 3.98 V vs. Li{sup +}/Li{sup 0}, which leads to a {beta}-LiVOPO{sub 4}-like structure but with lithium ordering which doubles the a and b unit cell parameters. Starting from chemically intercalated {beta}-Li{sub 0.92}VOPO{sub 4}, the reversible process involves 0.55 electron per transition metal, i.e., 90 mAh/g, at a C/50 rate which owing to the 3.95 V potential plateau, gives an attractive specific energy of 355 Wh/kg. Fundamentally, it is shown herein that the redox energy of V{sup 5+}N{sup 4+} couple in an octahedral coordination involving (V = O){sup m+} unit is included between those observed in oxides and in M{sub 2}(PO{sub 4}){sub 3} compounds with (PO{sub 4}){sup 3{minus}} oxo-anions.

• Research Organization: Univ. Pierre et Marie Curie-Paris VI (FR)
• OSTI ID: 20013023
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 12 Vol. 146; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
ANIONS
COORDINATION NUMBER
ELECTRIC BATTERIES
ELECTRICAL PROPERTIES
LITHIUM OXIDES
PHASE STUDIES
PHOSPHATES
VANADIUM OXIDES