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Investigations of Bulk Li–Mn–Ni–O Samples to Confirm the Combinatorial Studies

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Abstract

The key features in the Li–Mn–Ni–O pseudo-ternary phase diagrams, as determined using combinatorial samples, were confirmed with bulk samples synthesized under various conditions via two different synthesis routes. The four-phase equilibrium was observed and transformations were found to be reversible, thereby confirming that two three-phase regions exist and transform during slow cooling. The primary importance of this work is a better understanding of how the phase boundaries and coexisting regions transform when cooled at rates typically used commercially. It is also important to recognize that a small amount of transformation occurred even for samples quenched on a copper or steel plate. These changes cannot be avoided entirely without quenching in liquid nitrogen or avoiding the compositions where the transformations occur. Understanding the phase diagrams should have a significant impact on research focused on composite electrodes in the Li–Mn–Ni–O system, since this work identified the compositions and conditions required to obtain layered–layered nano-composites and layered–spinel composites.

Keywords

Bulk Sample Slow Cool Composite Electrode Combinatorial Sample Gibbs Triangle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.Physics and Atmospheric Sciences Dept.Dalhousie UniversityHalifax, Nova ScotiaCanada

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