ω-LixV2O5 — a new electrode material for rechargeable lithium batteries

✍ Scribed by C. Delmas; S. Brèthes; M. Ménétrier

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 431 KB
• Volume: 34
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(91)85030-z

✦ Synopsis

The electrochemical intercalation of lithium in VaO, down to a voltage smaller than 1.9 V leads irreversibly to the formation of a new material, u-I_&V~O~ (x -3), that exhibits very good electrochemical behavior. The new structural framework characteristic of wLi,V,O, is maintained during the lithium deintercalation, as shown by the occurrence of a solid solution and by the very good reversibility of the intercalation process. This material can also be obtained by reaction with an excess of n-butyIllthium. Its X-ray diffraction pattern is characteristic of a very disordered structure, nevertheless a few broad diffraction lines remain and are, furthermore, independent of the amount of intercalation. The specific energy related to the electrochemical reaction is very h&h: 450 W h kg-' of V,O, after 100 cycles in the 1.9-3.4 V range under 180 fi cm-'. Moreover, this value can be considerably increased if the cycling domain is extended (800 W h kg-' of V,O, between 1.9 and 4 V).