Characterization of SnO-MxOy (M=B and P) Glassy Anode Materials for Lithium Secondary Batteries Prepared by Melt-Quenching and Mechanical Milling

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Glasses in the systems SnO-B2O3 and SnO-P2O5 were prepared by melt-quenching and mechanical milling procedures. Glasses with higher SnO content, which could not be obtained by melt-quenching, were prepared by mechanical milling. Glass transition temperatures (Tg) in the SnO-P2O5 glasses were lower than those in the SnO-B2O3 glasses. The mechanically milled glasses showed lower Tg than the melt-quenched glasses. 31P MAS-NMR suggested that local structure around phosphorus atoms of the 67SnO•33P2O5 (mol%) glass obtained by mechanical milling was almost the same as the corresponding melt-quenched glass. The electrochemical properties of the SnO-based glasses were examined using a simple three electrodes cell with a conventional liquid electrolyte. The milled glasses as well as the quenched glasses worked as anode materials for lithium secondary batteries and exhibited high charge-discharge capacities.
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