Lithium-manganese-nickel-oxide electrodes with integrated layered-spinel structures for lithium batteries.
A series of lithium-manganese-nickel-oxide compositions that can be represented in three-component notation, xLi[Mn{sub 1.5}Ni{sub 0.5}]O{sub 4} {center_dot} (1-x)(Li{sub 2}MnO{sub 3} {center_dot} Li(Mn{sub 0.5}Ni{sub 0.5})O{sub 2}), in which a spinel component, Li[Mn{sub 1.5}Ni{sub 0.5}]O{sub 4}, and two layered components, Li{sub 2}MnO{sub 3} and Li(Mn{sub 0.5}Ni{sub 0.5})O{sub 2}, are structurally integrated in a highly complex manner, have been evaluated as electrodes in lithium cells for x = 1, 0.75, 0.50, 0.25 and 0. In this series of compounds, which is defined by the Li[Mn{sub 1.5}Ni{sub 0.5}]O{sub 4}{sup -} (Li{sub 2}MnO{sub 3} {center_dot} Li(Mn{sub 0.5}Ni{sub 0.5})O{sub 2}) tie-line in the Li[Mn{sub 1.5}Ni{sub 0.5}]O{sub 4}-Li{sub 2}MnO{sub 3}-Li(Mn{sub 0.5}Ni{sub 0.5})O{sub 2} phase diagram, the Mn:Ni ratio in the spinel and the combined layered Li{sub 2}MnO{sub 3} {center_dot} Li(Mn{sub 0.5}Ni{sub 0.5})O{sub 2} components is always 3:1. Powder X-ray diffraction patterns of the end members and the electrochemical profiles of cells with these electrodes are consistent with those expected for the spinel Li[Mn{sub 1.5}Ni{sub 0.5}]O{sub 4} (x = 1) and for 'composite' Li{sub 2}MnO{sub 3} {center_dot} Li(Mn{sub 0.5}Ni{sub 0.5})O{sub 2} layered electrode structures (x = 0). Electrodes with intermediate values of x exhibit both spinel and layered character and yield extremely high capacities, reaching more than 250 mA h/g with good cycling stability between 2.0 V and 4.95 V vs. Li{sup o} at a current rate of 0.1 mA/cm{sup 2}.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- EE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 939310
- Report Number(s):
- ANL/CMT/JA-57404; TRN: US200823%%7
- Journal Information:
- Electrochem. Commun., Vol. 9, Issue 2 ; Feb. 2007; ISSN 1388-2481
- Country of Publication:
- United States
- Language:
- ENGLISH
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