Electronic transport in Lithium Nickel Manganese Oxide, a high-voltage cathode material for Lithium-Ion batteries
Name
861617665-MIT.pdf
Description
Full printable version
Size
11.89 MB
Format
Adobe PDF
Checksum (MD5)
ed23cc72ede116c55ae6952089e7da6f
Author(s)
Ransil, Alan Patrick Adams
Advisor(s)
Yet-Ming Chiang.
Alternative Title
Electronic transport in LNMO, a high-voltage cathode material for Lithium-Ion batteries
Date Issued
2013
Publisher
Massachusetts Institute of Technology
Abstract
Potential routes by which the energy densities of lithium-ion batteries may be improved abound. However, the introduction of Lithium Nickel Manganese Oxide (LixNi1i/2Mn3/2O4, or LNMO) as a positive electrode material appears to be one of the shortest. LNMO is a high-voltage material, with a voltage of 4.7V, and thus offers a significant energy density boost without straying far outside of the stability window of common carbonate-based electrolytes. Furthermore, it would serve as a drop-in replacement for the positive electrode materials already used. In order to best engineer such devices to take full advantage of the intrinsic transport properties of the material, it is important to develop an understanding of what these transport properties are. For a deep understanding of the material such properties must be related not only to material performance but to the processing conditions and atomic structure of the material. The material may be processed such that it belongs in either the P4 332 or the Fd3m space group, exhibiting either order or disorder respectively of Ni and Mn cations. Such processing has a great effect on the concentrations of electronic charge carriers, and thus an effect on the DC electronic conductivity of the material. This conductivity was thus measured for both processing conditions as a function of the lithiation state, and then related to carrier concentrations via the small polaron model for charge conduction. In such a way, the links betweer processing, structure and properties of this material were elucidated. It is hoped that this work will be built upon in order to engineer the high energy-density batteries of the future.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, February 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 86-90).
Subjects
Materials Science and Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
M.I.T. theses are protected by
copyright. They may be viewed from this source for any purpose, but
reproduction or distribution in any format is prohibited without written
permission. See provided URL for inquiries about permission.
copyright. They may be viewed from this source for any purpose, but
reproduction or distribution in any format is prohibited without written
permission. See provided URL for inquiries about permission.
Persistent DSpace Link
