Synthesis and structural aspects of LiMn{sub 2}O{sub 4{+-}{delta}} as a cathode for rechargeable lithium batteries

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.2044266· OSTI ID:99603

Yamada, Atsuo; Miura, Kaoru; Hinokuma, Koichiro; Tanaka, Masahiro ^[1]

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1. Sony Corporation Research Center, Yokohama (Japan)

The phase diagram of LiMn{sub 2}O{sub 4} over a wide oxygen pressure-temperature region was determined, and the thermodynamics of the oxygen extraction (the heat of reaction, {Delta}H, etc.) were estimated using thermal analysis, X-ray diffraction, sample quenching, and a high pressure oxygen treatment. The oxygen stoichiometry, {delta}, in LiMn{sub 2}O{sub 4{+-}{delta}} varied with the selection of treatment conditions. The extent of the cooperative Jahn-Teller effect in the LiMn{sub 2}O{sub 4{minus}{delta}} and various kinds of spinel Mn oxides are discussed in terms of the Madelung potential and Mn valency using the DV-X{alpha} calculation. The performance of coin-type cells containing cathodes of the synthesized spinel was investigated and compared to that of cells containing standard LiMn{sub 2}O{sub 4} spinel cathodes.

• Sponsoring Organization: USDOE
• OSTI ID: 99603
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 7 Vol. 142; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CATHODES
CRYSTAL STRUCTURE
ELECTRIC BATTERIES
FABRICATION
LITHIUM COMPOUNDS
MANGANATES
PHASE DIAGRAMS
THERMODYNAMIC PROPERTIES