ChemInform Abstract: Mapping of Transition Metal Redox Energies in Phosphates with NASICON Structure by Lithium Intercalation.

✍ Scribed by A. K. PADHI; K. S. NANJUNDASWAMY; C. MASQUELIER; J. B. GOODENOUGH

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 29 KB
• Volume: 28
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199747008

✦ Synopsis

Mapping of Transition Metal Redox Energies in Phosphates with NASICON Structure by Lithium Intercalation.

-The relative positions of Nb4+/Nb3+, Nb5+/Nb4+, Ti4+/Ti3+, Fe3+/Fe2+, V4+/V3+, and V3+/V2+ redox couples with respect to the Fermi energy of Li are determined for Li-intercalated phosphates with NASICON structure such as Li2FeTi(PO4)3, LiNa2FeV(PO4)3, Li2NaV2(PO4)3, TiNb( PO4)3, and LiFeNb(PO4)3, prepared by various methods. Among all couples studied, the V4+/V3+ redox couple is most stable lying . apprxeq.3.8 eV below the Fermi energy of Li while the least stable V3+/ V2+ couple lies only 1.7 eV below the Fermi level of Li. Several redox couples are found to overlap each other. Some compounds are promising positive electrode materials for rechargeable Li batteries with high power density. -(PADHI, A. K.; NANJUNDASWAMY,