20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

Enhancing the Cycling Stability of SnO${}_2$ Hollow Spheres for a Li-ion Battery Anode by Titanium Dioxide Coating

21 May 2015, 13:00
3h 30m
Board: MNA-55
Poster presentation Material Physics, Nanoscale Physics and Nanotechnology Poster-3

Speaker

Songyoot Kaewmala (Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Description

SnO${}_2$ material has attracted much attention due to its high theoretical capacity (790 mAh/g) compared to the current carbon- based anode (372 mAh/g). However, the SnO${}_2$ material exhibits a large volume expansion (up to 300 Vol. %) during charging and discharging, which causes crumbling and cracking of the electrode leading to large capacity loss and poor cycling stability. Creating SnO${}_2$ with unique nanostructure such as hollow spheres can reduce but not diminish the volume expansion. In this study, the effect of TiO${}_2$ coating in reducing the volume expansion of the SnO${}_2$ hollow spheres is investigated. Effects of different crystal structures of TiO${}_2$ and thickness of TiO${}_2$ coating are particularly studied. The results show that the amorphous TiO${}_2$ coating with a thickness of about 90 nm has the highest ability to accommodate the volume expansion of SnO${}_2$ hollow spheres leading to an improved cycling stability of the electrode.

Primary author

Songyoot Kaewmala (Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Co-authors

Prof. Nonglak Meethong (Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002) Dr Pimpa Limthongkul (National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani, THAILAND 12120)

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