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Chemistry | Consequences of Combinatorial Studies of Positive Electrodes for Li-ion Batteries

Consequences of Combinatorial Studies of Positive Electrodes for Li-ion Batteries

Series: Springer Theses

McCalla, Eric

2014, XXXV, 146 p. 103 illus., 63 illus. in color.

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  • Nominated by Dalhousie University as an outstanding PhD thesis
  • In-depth discussion of quantitative analysis of XRD data from combinatorial samples
  • Contains phase diagrams of high precision
  • Covers highly significant applications to positive electrodes in Li-ion batteries

Li-Co-Mn-Ni oxides have been of extreme interest as potential positive electrode materials for next generation Li-ion batteries.  Though many promising materials have been discovered and studied extensively, much debate remains in the literature about the structures of these materials.  There is no consensus as to whether the lithium-rich layered materials are single-phase or form a layered-layered composite on the few nanometer length-scales.  Much of this debate came about because no phase diagrams existed to describe these systems under the synthesis conditions used to make electrode materials.  Detailed in this thesis are the complete Li-Co-Mn-O and Li-Mn-Ni-O phase diagrams generated by way of the combinatorial synthesis of mg-scale samples at over five hundred compositions characterized with X-ray diffraction.  Selected bulk samples were used to confirm that the findings are relevant to synthesis conditions used commercially.  The results  help resolve a number of points of confusion and contradiction in the literature.  Amongst other important findings, the compositions and synthesis conditions giving rise to layered-layered nano-composites are presented and electrochemical results are used to show how better electrode materials can be achieved by making samples in the single phase-layered regions.

Content Level » Research

Keywords » Combinatorial Science - Li-Co-Mn-O systems - Li-Mn-Ni-O systems - Li-ion Batteries - Positive Electrodes - XRD Analysis

Related subjects » Characterization & Evaluation of Materials - Chemistry - Electrochemistry - Systems, Storage and Harvesting

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