Pre-annealing treatment effects on the electrochemical performances of lithium-rich layered oxide cathodes for Li-ion battery

Ajayi, O.S and Ehi-Eromosele, C. O. and Ajanaku, K. O. and Adekoya, J. A. (2022) Pre-annealing treatment effects on the electrochemical performances of lithium-rich layered oxide cathodes for Li-ion battery. J Mater Sci: Mater Electron.

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Abstract

Lithium-rich layered oxides (LLOs) are highly promising cathodes for highcapacity Li-ion batteries (LIBs). Typically, high annealing temperatures and durations have been used in the synthesis of these materials. Appropriate synthetic methods must be employed to successfully synthesise them at lower annealing temperatures. Herein, the effects of pre-annealing temperature on the structural and electrochemical performances of the LLOs are evaluated. X-ray diffraction and Raman spectra analysis show that the pre-annealed samples displayed higher crystal defects such as dislocation density, micro-strain, cationic disorder and smaller crystallites compared to the post-annealed sample. Also, the pre-annealed cathode materials showed better electrochemical performances, including higher specific capacity, excellent rate performance, and better cycling stability. The much improved electrochemical performances of the pre-annealed cathodes were explained on the basis of their higher crystal defects which reduce the energy barrier for lithium-ion mobility. In addition, pre-annealing allowed the synthesis of these LLOs at a lower temperature and annealing duration which could help reduce the cost of LIBs. These results show that pre-annealing treatment is also an important synthesis parameter that could be exploited to optimise the structure–function relationships in materials to achieve optimal performance.

Item Type:	Article
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Divisions:	Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User:	AKINWUMI
Date Deposited:	10 Nov 2022 15:47
Last Modified:	10 Nov 2022 15:47
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/16433

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