Publication Date
2024
Document Type
Dissertation/Thesis
First Advisor
Brown, Dennis E.
Degree Name
Ph.D. (Doctor of Philosophy)
Legacy Department
Department of Physics
Abstract
Sodium-ion batteries are an attractive alternative to traditional lithium-ion batteries due to their low cost and eco-friendly components. The Fe3+/Fe4+ redox reaction provides similar operating voltages and specific energy densities to that of lithium-ion batteries. Mössbauer spectroscopy is a useful x-ray technique for measuring the chemical environment inside of the metal enclosure of batteries. In particular, it can measure the relative concentration of Fe3+/Fe4+ ions as a function of the battery’s voltage. In this dissertation ex-situ and in-situ Mössbauer spectroscopy were used to map out the effect of various electrolytes on the performance of NaFe(1−x)(Ni0.5Mn0.5)xO2 batteries. This was done by observing the time dependence of the isomer shifts and quadrupole splittings as a function of state of charge (SOC). A unique hermetically sealed Mössbauer battery cell was constructed for the in-situ measurements. This cell was used to successfully achieved more than 40% relative concentration of Fe4+.
Anode free Na metal batteries are promising for future energy storage because they provide the highest energy densities and also eliminate the need of handling hazardous Na metals during manufacturing. The high performance includes consistently higher than 99.8% Faradaic efficiencies, much more stable interfacial resistance, and negligible formation of mossy Na after 500 cycles. Anode-free Na metal batteries equipped with high-capacity sodium vanadium phosphate cathodes and pure Cu current collector exhibited at least ≈ 70% capacity retention for 100 cycles
Recommended Citation
Abdul Razak, Iddrisu Bachokun, "Using Ex-Situ and In-Situ Mössbauer Spectroscopy to Study the Degradation of Nafe(1−x)(ni0.5mn0.5)x O2 Batteries" (2024). Graduate Research Theses & Dissertations. 7944.
https://huskiecommons.lib.niu.edu/allgraduate-thesesdissertations/7944
Extent
173 pages
Language
en
Publisher
Northern Illinois University
Rights Statement
In Copyright
Rights Statement 2
NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.
Media Type
Text
