Structural and electrochemical investigation of lithium insertion in the Li1 − xMn2O4 spinel phase

✍ Scribed by M.Y. Saïdi; J. Barker; R. Koksbang

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 574 KB
• Volume: 41
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(95)00311-2

✦ Synopsis

Electrochemical and x-ray diffraction measurements have been performed on two lithium deficient lithium manganese oxide phases, namely Li,,,~Mn,O, and Lip,csMntO,. These materials were prepared by a chemical oxidative treatment of the parent LiMn,O, spmel phase in acidic conditions. The results are compared and contrasted with equivalent measurements carried out on the parent spine1 phase. The lithium deficient materials show a characteristic featureless voltage curve during the initial lithium intercalation process quite unlike that in the parent compound LiMn,O,. The results presented highlight a distinct difference in the initial electrochemical behavior of chemically and electrochemically de-lithiated LiMn,O, . Following the initial lithium intercalation process the materials' electrochemical performance appear to revert to those of the parent spine1 compound. The excellent electrochemical reversibility of the lithium insertion/extraction reactions in these phases is demonstrated conclusively.