An electron energy loss spectroscopy and electron diffraction study of the Pmnb polymorph of Li2MnSiO4

Gummow, R.J., Blackford, M.G., Lumpkin, G.R., and He, Y. (2013) An electron energy loss spectroscopy and electron diffraction study of the Pmnb polymorph of Li2MnSiO4. Journal of Alloys and Compounds, 551. pp. 521-526.

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Abstract

The Mn valency and the crystallinity of Li₂MnSiO₄ cathodes (Pmnb form) were examined with electron energy-loss spectroscopy (EELS) and selected area electron diffraction (SAED) both before and after electrochemical lithium extraction. A decrease in the crystallinity of the delithiated charged cathode particles compared to the as-prepared material was observed. The decrease in crystallinity varied from particle to particle. EELS analysis showed that the non-uniform decrease in crystallinity was due to a non-uniform extraction of lithium from the particles. The observed decrease in discharge capacity of the Pmnb polymorph of Li₂MnSiO₄ with cycling was attributed to the progressive loss of crystallinity and the structural collapse of Li diffusion pathways.

Item ID: 23941
Item Type: Article (Research - C1)
ISSN: 0925-8388
Keywords: electron energy loss spectroscopy; transition metal alloys crystal structure; amorphisation
Funders: JCU internal, Australian Institute of Nuclear Science and Engineering (AINSE)
Projects and Grants: Lithium battery
Date Deposited: 01 Feb 2013 05:47
FoR Codes: 03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl Structural) > 030604 Electrochemistry @ 20%
03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl Structural) > 030606 Structural Chemistry and Spectroscopy @ 40%
09 ENGINEERING > 0912 Materials Engineering > 091205 Functional Materials @ 40%
SEO Codes: 85 ENERGY > 8506 Energy Storage, Distribution and Supply > 850602 Energy Storage (excl. Hydrogen) @ 100%
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