119Sn Mossbauer parameters as predictive tool for future Sn-based negative electrode materials

Thanks to the Sn-119 Mossbauer hyperfine parameters, it is possible to analyze and predict Li reaction mechanisms with Sn-based negative electrodes for Li-ion batteries. The present approach is based on the interpretation of the Sn-119 Mossbauer hyperfine parameters: isomer shift (delta) and quadrupole splitting (Delta) by considering: (i) the analysis of the Sn-119 Mossbauer hyperfine parameters of the Li-Sn alloys used as model compounds, (ii) their interpretation from some physicochemical parameters (Li/Sn ratio, crystal structure, electronic density as defined by Hume-Rothery), and (iii) the proposition of an experimental based model to understand Li lithiation/delithiation mechanisms and predict electrochemical performances for Sn-based compounds including the effects of volume variations, particle coalescence or SEI formation. (C) 2008 Elsevier B.V. All rights reserved.