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Factors Influencing the Lithium Extraction Rate in Layered Oxide Cathodes of Lithium Ion Cells

Published online by Cambridge University Press:  01 February 2011

A. Manthiram  and
J. Choi
A. Manthiram
Affiliation:
Materials Science and Engineering Program, The University of Texas at Austin Austin, Texas 78712
J. Choi
Affiliation:
Materials Science and Engineering Program, The University of Texas at Austin Austin, Texas 78712
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Abstract

The lithium extraction rate and the rate capability of layered LiNi0.5–0.5yMn0.5–0.5yCoyO2 with 0 ≤ y ≤ 1 have been investigated, respectively, by chemically extracting lithium with the oxidizer NO2BF4 in acetonitrile medium and electrochemically discharging at various C-rates. Both the chemical lithium extraction rate and the electrochemical rate capability are found to increase with increasing Co content y in LiNi0.5–0.5yMn0.5–0.5yCoyO2. While no clear relationship is seen between electrical conductivity and the rate capability, increasing cation disorder between the lithium and transition metal planes with decreasing Co content is found to decrease the chemical lithium extraction rate and rate capability. The lithium extraction rate also influences the structure (P3 vs O1 vs O3) of the end members Ni0.5–0.5yMn0.5–0.5yCoyO2-δ obtained by extracting all the lithium with 100 % excess NO2BF4 in an acetonitrile medium.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K11.11
Copyright
Copyright © Materials Research Society 2005

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References

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