Optimization of spinel Li{sub 1+x}Mn{sub 2{minus}y}O{sub 4} as a 4 V Li-cell cathode in terms of a Li-Mn-O phase diagram
- Saga Univ. (Japan). Dept. of Applied Chemistry
A semiquantitative Li-Mn-O phase diagram is proposed to analyze the relationship between the capacity and rechargeability of spinel Li{sub 1+x}Mn{sub 2{minus}y}O{sub 4} ({minus}0.11 {le} x {le} 0.33, 0 {le} y {le} 0.33) as a 4 V cathode for lithium-ion batteries. Each compound on the LiMn{sub 2}O{sub 4}-Li{sub 4}Mn{sub 5}O{sub 12}-Li{sub 2}Mn{sub 4}O{sub 9} triangle can be prepared directly by solid-solid reaction techniques. The chemical formula of each compound is expressed as Li{sub 8n/(n+m)}O{sub 4} (0.5 {le} n {le} 0.8, 3.5 {le} m {le} 4.0) through knowledge of the Li/Mn molar ratio, n, and the average Mn valence, m. Each compound has an initial capacity of 1,184 {times} (4 {minus} m)/(m + n) mAh/g. The capacity decreases with increases in both lithium content and vacancy rate along one sheet of the hyperboloid, while the rechargeability improves. The synthesis conditions for preparation of an optimal spinel with a large capacity and an ideal rechargeability can be estimated.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 603732
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 12 Vol. 144; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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