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Synthesis and Electrochemical Characterization of M2Mn3O8 (M=Ca,Cu) Compounds and Derivatives [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 2005.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:
United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
M₂Mn₃O₈ (M=Ca{sup 2+}, Cu{sup 2+}) compounds were synthesized and characterized in lithium cells. The M{sup 2+} cations, which reside in the van der Waal's gaps between adjacent sheets of Mn₃O₈⁴⁻, may be replaced chemically (by ion-exchange) or electrochemically with Li. More than 7 Li⁺/Cu₂Mn₃O₈ may be inserted electrochemically, with concomitant reduction of Cu{sup 2+} to Cu metal, but less Li can be inserted into Ca₂Mn₃O₈. In the case of Cu{sup 2+}, this process is partially reversible when the cell is charged above 3.5 V vs. Li, but intercalation of Cu⁺ rather than Cu{sup 2+} and Li⁺/Cu⁺ exchange occurs during the subsequent discharge. If the cell potential is kept below 3.4 V, the Li in excess of 4Li⁺/Cu₂Mn₃O₈ can be cycled reversibly. The unusual mobility of +2 cations in a layered structure has important implications both for the design of cathodes for Li batteries and for new systems that could be based on M{sup 2+} intercalation compounds.
Report Numbers:
E 1.99:lbnl--58737
lbnl--58737
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Note:
Published through SciTech Connect.
08/25/2005.
"lbnl--58737"
": VT0301030"
Solid State Ionics 177 9-10 ISSN 0167-2738; SSIOD3 FT
Doeff, Marca M.; Park, Yong Joon.
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Korean Research Foundation GrantM01-2004-000-20008-0
Funding Information:
DE-AC02-05CH11231
500301
View MARC record | catkey: 14100222