4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
The Proceedings of SAIP2016 published on 24 December 2017
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Characterization of Complex Spinel LiMn2O4 Nanosheet Simulated via Armorphization and Recrystalization Technique

Presented by Ms. Raesibe Sylvia LEDWABA on 5 Jul 2016 from 16:10 to 18:00
Type: Poster Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.259

Abstract

Particle size reduction (mm to nm) is one of the strategies identified to shorten the electron and lithium ion diffusion paths in cathodes materials for lithium-ion batteries. Its implementation has resulted in enhanced rate capability, improved cycling stability and electrochemical performance of LiMn<sub>2</sub>O<sub>4</sub> [1]. The armorphization and recrystallization technique is a practical tool to compliment annealing in experiments. It was previously employed to generate nano-architectures of binaries such as MnO<sub>2</sub> [2] and will be used in the current study on the spinel. Analysis of atomic crystal structures and microstructures of the resulting models, revealed presence of the spinel LiMn<sub>2</sub>O<sub>4</sub> polymorph, rutile-MnO<sub>2</sub> and layered-Li<sub>2</sub>Mn O<sub>3</sub> in the nanosheet LiMn<sub>2</sub>O<sub>4</sub>. The highly defected structures revealed vacancies and comprise substitutions of Li and Mn in different layers, which suggest possible mechanisms for Li mobility. The calculated XRD compare favourably with measured XRD providing valuable insights of the atomistic models and supporting observations in microstructural features.

Award

yes

Level

PhD

Supervisor

Prof. Phuti Ngoepe Phuti.ngoepe@ul.ac.za University of Limpopo

Paper

Yes

Permission

No

Place

Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room:


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