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.

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