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The Syntheses and Characterization of Layered LiNi1-y-zMnyCozO2 Compounds

Published online by Cambridge University Press:  11 February 2011

J. Katana Ngala ,
Natasha A. Chernova ,
Luis Matienzo ,
Peter Y. Zavalij  and
M. Stanley Whittingham
J. Katana Ngala
Affiliation:
Chemistry Department and the Institute for Materials Research, State University of NewYork at Binghamton, Binghamton, NewYork 13902–6016, U.S.A.
Natasha A. Chernova
Affiliation:
Chemistry Department and the Institute for Materials Research, State University of NewYork at Binghamton, Binghamton, NewYork 13902–6016, U.S.A.
Luis Matienzo
Affiliation:
Chemistry Department and the Institute for Materials Research, State University of NewYork at Binghamton, Binghamton, NewYork 13902–6016, U.S.A.
Peter Y. Zavalij
Affiliation:
Chemistry Department and the Institute for Materials Research, State University of NewYork at Binghamton, Binghamton, NewYork 13902–6016, U.S.A.
M. Stanley Whittingham*
Affiliation:
Chemistry Department and the Institute for Materials Research, State University of NewYork at Binghamton, Binghamton, NewYork 13902–6016, U.S.A.
*
* Contact author: stanwhit@binghamton.edu
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Abstract

The layered compounds of formula LiNi0.4Mn0.6-yCoyO2, for y=0.2, 0.3, and 0.4 and LiNi0.7-yMn0.3CoyO2 for y=0.3, and 0.1 were synthesized at 800°C. X-ray powder diffraction indicates layered structure of R 3m symmetry similar to a-NaFeO2. Rietveld refinement data shows that Mn and Ni increase the tendency of transition metal ions to migrate into the interlayer sites relative to LiCoO2. Both magnetic susceptibility and XPS data support a 2+ oxidation state for Ni and 4+ and 3+ for Mn and Co, respectively. The layered compound LiNi0.4Mn0.4Co0.2O2 shows a high initial capacity of about 200mAh/g when cycled between 2.5V and 4.3 V at 20°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE6.4
Copyright
Copyright © Materials Research Society 2003

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References

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