Coating and Doping Modification Strategies for Ni-rich layered NCM cathode materials

Hong, Liang

Coating and Doping Modification Strategies for Ni-rich layered NCM cathode materials

Hong, Liang

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Publication Type:: Thesis
Issue Date:: 2024

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Field	Value	Language
dc.contributor.author	Hong, Liang
dc.date.accessioned	2025-01-24T02:53:11Z
dc.date.available	2025-01-24T02:53:11Z
dc.date.issued	2024
dc.identifier.uri	http://hdl.handle.net/10453/184157
dc.description	University of Technology Sydney. Faculty of Science.	en_US.UTF-8
dc.description.abstract	Nickel cobalt manganese oxide (NCM) materials are commonly used as lithium-ion battery cathode materials. The thesis first reviews different modification methods and effects of NCM cathode material. It discusses the effects of different modification strategies on the electrochemical properties and crystal structure of NCM cathode materials. Ni-rich layered NCM cathode material is one of important NCM cathode materials. Therefore, it is necessary to construct protective layers for Ni-rich layered NCM cathode materials. Notably, the thesis introduces a cerium (Ce) element to modify the NCM90 (LiNi0.9Co0.05Mn0.05O2) cathode material. The NCM precursor reacts with cerium hydroxide and lithium hydroxide at high temperature and generates a modification strategy for Ni-rich layered NCM cathode material with cerium oxide (CeO2). This strategy can enhance the specific capacity of NCM cathode materials, improve the energy density and stabilize the lattice structure of Ni-rich layered NCM cathode material. In this thesis, 2%-CeO2@NCM90 cathode material exhibits better electrochemical performance than the pristine NCM90 cathode material at different current densities. Some Ce4+ ions are reduced to Ce3+ ions, and some Ni2+ ions in the NCM cathode material are also converted to Ni3+ ions. The modified NCM90 cathode material has better electrochemical performance because the diffusion rate of lithium ions in the material is increased, the mixing of cations is reduced, and harmful interfacial phase transitions are reduced. In addition, cerium weakens the volume change of the NCM cathode material, reduces the release of active oxygen, and increases the stability of the transition metal and lithium layers in the NCM cathode material.	en_US.UTF-8
dc.format	Thesis (MSc)
dc.language.iso	en_US	en_US.UTF-8
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/184157/1/thesis.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	© 2024 Liang Hong
dc.rights	au.edu.uts.lib/cph
dc.title	Coating and Doping Modification Strategies for Ni-rich layered NCM cathode materials	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

Nickel cobalt manganese oxide (NCM) materials are commonly used as lithium-ion battery cathode materials. The thesis first reviews different modification methods and effects of NCM cathode material. It discusses the effects of different modification strategies on the electrochemical properties and crystal structure of NCM cathode materials. Ni-rich layered NCM cathode material is one of important NCM cathode materials. Therefore, it is necessary to construct protective layers for Ni-rich layered NCM cathode materials. Notably, the thesis introduces a cerium (Ce) element to modify the NCM90 (LiNi0.9Co0.05Mn0.05O2) cathode material. The NCM precursor reacts with cerium hydroxide and lithium hydroxide at high temperature and generates a modification strategy for Ni-rich layered NCM cathode material with cerium oxide (CeO2). This strategy can enhance the specific capacity of NCM cathode materials, improve the energy density and stabilize the lattice structure of Ni-rich layered NCM cathode material. In this thesis, 2%-CeO2@NCM90 cathode material exhibits better electrochemical performance than the pristine NCM90 cathode material at different current densities. Some Ce4+ ions are reduced to Ce3+ ions, and some Ni2+ ions in the NCM cathode material are also converted to Ni3+ ions. The modified NCM90 cathode material has better electrochemical performance because the diffusion rate of lithium ions in the material is increased, the mixing of cations is reduced, and harmful interfacial phase transitions are reduced. In addition, cerium weakens the volume change of the NCM cathode material, reduces the release of active oxygen, and increases the stability of the transition metal and lithium layers in the NCM cathode material.

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http://hdl.handle.net/10453/184157