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Structural and Electrochemical Properties of LiMn0.4Ni0.4Co0.2O2

Published online by Cambridge University Press:  01 February 2011

Miaomiao Ma ,
Natasha A. Chernova ,
Peter Y. Zavalij  and
M. Stanley Whittingham
Miaomiao Ma
Affiliation:
Materials Science, State University of New York at Binghamton, Binghamton, NY, 13902, USA
Natasha A. Chernova
Affiliation:
Materials Science, State University of New York at Binghamton, Binghamton, NY, 13902, USA
Peter Y. Zavalij
Affiliation:
Materials Science, State University of New York at Binghamton, Binghamton, NY, 13902, USA
M. Stanley Whittingham
Affiliation:
Materials Science, State University of New York at Binghamton, Binghamton, NY, 13902, USA
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Abstract

The layered oxide LiMn0.4Ni0.4Co0.2O2 was synthesized by heating the mixed hydroxide precursor. This 442 composition was found to show high capacity. It has the optimum cobalt concentration to both substantially order the lattice, yet leave enough nickel on the lithium sites to minimize conversion to the 1T structure of CoO2 on deep charging. A combined x-ray and neutron diffraction study showed conclusively that only nickel, not manganese or cobalt is found on the lithium sites at room temperature. Magnetic measurements also confirmed the presence of nickel on the lithium sites, and showed the effectiveness of cobalt at minimizing nickel disorder. Heating above 800°C always leads to nickel disorder. The structural and thermal stability of reduced lithium content materials was studied; the structure remains rhombohedral except for x≤0.05, and cobalt substitution improves the thermal stability of the layered compound, but not the chemical stability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K11.3.3
Copyright
Copyright © Materials Research Society 2005

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References

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