On improvements of sodium manganese oxide materials as sodium-ion battery cathode
Mainly due to potential cost advantages sodium-ion batteries have the potential to become an alternative to lithium-ion batteries. In this work strategies to improve cycling stability of the cathode material P2-NaxMnO2 are presented. Cobalt-doping on the order of 10% leads to a suppression of struct...
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| Format: | Thesis |
| Language: | English |
| Published: |
2018
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| Online Access: | https://hdl.handle.net/10356/88417 http://hdl.handle.net/10220/45953 |
| Summary: | Mainly due to potential cost advantages sodium-ion batteries have the potential to become an alternative to lithium-ion batteries. In this work strategies to improve cycling stability of the cathode material P2-NaxMnO2 are presented. Cobalt-doping on the order of 10% leads to a suppression of structural changes, resulting in improved
cyclability, and enhanced Na+ diffusion kinetics. Moreover, capacity and cyclability can
be increased by an optimization of the morphology. A combination of both strategies
leads to a material with comparably best discharge capacity and cycling stability.
Natrium-Ionen-Batterien gelten hauptsächlich aufgrund potenzieller Kostenvorteile als
mögliche Alternative zu Lithium-Ionen-Batterien. Diese Arbeit beschreibt Strategien
zur Verbesserung der Zyklenstabilität von P2-NaxMnO2 als Kathodenmaterial. Eine
~10%ige Cobalt-Substitution bewirkt eine Unterdrückung von Strukturumwandlungen
und eine Verbesserung der Na+-Diffusion. Des Weiteren kann die Kapazität und
Zyklenstabilität durch eine Optimierung der Morphologie verbessert werden. Die
Kombination beider Strategien vereint die jeweiligen Vorteile und führt zu einem
Material mit hoher Kapazität und vergleichsweise bester Zyklenstabilität.
This doctoral thesis is the cumulative integration of the scientific publications resulting
from my work as a research associate at TUM CREATE. After a brief overview of
different battery technologies, sodium-ion batteries are described in detail, followed by
a description of the main experimental methods employed in this work. Subsequently,
my four scientific publications, as well as one further publication in which my
contribution was crucial, are presented. The thesis is concluded with a discussion of
the presented results. |
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