Behaviour of AgBi(Cr2O7)2 as a possible cathode for lithium cells

✍ Scribed by J. Sarradin; R. Messina; J. Perichon; M. Broussely

• Book ID: 103897899
• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 394 KB
• Volume: 10
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(83)80007-x

✦ Synopsis

The electrochemical reduction of AgBi(Cr,O,)? electrodes occurs in a nearly continuous way from 3.5 V to 2 V/Li+/Li and leads to a final oxidation state of about III for chromium ions. Three reduction steps can be distinguished:

-Cr(V1) reduction leading approximately to Cr(V) -Ag( I) reduction to Ag( 0) -Further reduction of chromium, leading approximately to Cr(II1) in a quasi-reversible way. A loss of capacity was observed, however, during repeated charge/discharge cycles.

R&urn6

La reduction intensiostatique d'electrodes modeles de AgBi(Cr,O,), se produit de mar&e pratiquement continue entre 3.5 V et 2 V/Li+/Li et aboutit en definitive i la formation probable de Cr(II1). On peut neanmoins mettre en evidence trois &apes de reduction:

-passage de Cr(V1) jusqu'a un stade voisin de Cr(V) -reduction de Ag(1) en Ag(0) -une &tape quasi reversible aboutissant a la formation de Cr(II1). Cependant, la phase formee i l'issue de la reduction de Ag(1) est peu stable, comme le montrent les cycles charge/decharge du mat&au.