Negative and positive electrode materials for lithium-ion batteries

✍ Scribed by Dominique Guyomard; Annie Le Gal La Salle; Yves Piffard; Alain Verbaere; Michel Tournoux

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 737 KB
• Volume: 2
• Category: Article
• ISSN: 1387-1609
• DOI: 10.1016/s1387-1609(00)88572-2

✦ Synopsis

MnVzO,, (0.5 < 6 < 1) amorphous oxides reversibly insert large amounts of Li (e.g. Li12MnV206,96) at low voltage (= 1 V). During the first Li insertion, Mn 4+ is first reduced to Mnz+ and Vs' is reduced to V3+. Upon further cycling, the V oxidation state varies reversibly between +3 and +5, whereas the average Mn oxidation state varies reversibly between +2 and -+2.6. Reversible lithium deintercalation of LiCrMn-0, very poor or y 2 0.75 due to a migration of transition metal cations from 16d to 8a and I6c sites, where they i (0 <y < 1) occurs in two steps at =: 4.9 V and 4 V. Th e cyclability is excellent fory I 0.5. It becomes accumulate upon cycling. 0 1999 Acadtmie des sciences / Editions scientifiques et medicales Elsevier SAS. 1387-1609/99/00020603 0 1999 Acadimie des sciences I &ions scientifiques et mCdic&s Elsevier SAS. Tous droits rCserv&