The defect structure model in nonstoichiometric LiMn{sub 2}O{sub 4{minus}{delta}}
- Tokyo Inst. of Tech., Meguro, Tokyo (Japan). Dept. of Chemical Engineering
Lithium manganese oxide LiMn{sub 2}O{sub 4} with a cubic spinel structure and the related spinel compounds (e.g., Li{sub 4}Mn{sub 5}O{sub 12}) have been examined as candidates for the cathode material of secondary lithium battery. The defect model of nonstoichiometric spinel LiMn{sub 2}O{sub 4{minus}{delta}} prepared under the control of oxygen partial pressures was determined by solid density measurement. There are two possible defect models. One is the oxygen deficient model, (Li){sub 8a}[Mn{sub 2}]{sub 16d}[O{sub 4{minus}{delta}}]{sub 32e} and the other the metal excess model, (Li){sub 8a}[Li{sub {delta}/(4{minus}{delta})}Mn{sub 2{delta}/(4{minus}{delta})}]{sub 16c}[Mn{sub 2}]{sub 16d}[O{sub 4}]{sub 32e} model. It is expected that the solid density of the former model would decrease with increasing {delta} and that of the latter would increase with increasing {delta}. Since the observed density of the nonstoichiometric spinel actually increased, the metal excess model was supported for the nonstoichiometry.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 509367
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 144; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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