The role of oxygen in low-potential Li insertion in metal oxide anode materials
Transition metal oxides are high-capacity lithium storage materials of interest as possible anode materials in the next generation of Li ion batteries. By using X-ray absorption spectroscopy the authors have obtained an understanding of the process of Li uptake and removal within Na{sub 0.25}MoO{sub 3}. Results show the Li{sub 2}O matrix on reduction is not inert; Mo-O bonds are reversibly consumed on discharge and are regenerated on charge, with the Li{sub 2}O matrix acting as the oxygen reservoir. The migration of oxygen atoms from the matrix to the active centers occurs at a voltage below that expected for the Li{sub 2}O free energy of formation. Polarization on charge is not due only to oxygen migration but also to metal rearrangement within the electrode material. The reversibility of the Mo-O bond formation on repeated cycles is a function of the depth of discharge, with 200 mV being the lower limit.
- Research Organization:
- Univ. Blaise-Pascal, Aubiere (FR)
- OSTI ID:
- 20086880
- Resource Relation:
- Conference: 1999 Materials Research Society Spring Meeting, San Francisco, CA (US), 04/05/1999--04/08/1999; Other Information: PBD: 2000; Related Information: In: New materials for batteries and fuel cells. Materials Research Society symposium proceedings, Volume 575, by Doughty, D.H.; Nazar, L.F.; Arakawa, Masayasu; Brack, H.P.; Naoi, Katsuhiko [eds.], 454 pages.
- Country of Publication:
- United States
- Language:
- English
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