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Jerliu, B; Hüger, E; Dörrer, L; Seidlhofer, B.-K; Steitz, R; Oberst, V; Geckle, U; Bruns, M; Schmidt, H
Journal of physical chemistry. C, 05/2014, Volume: 118, Issue: 18Journal Article
Amorphous silicon is a promising high-capacity anode material for the next generation of lithium-ion batteries. However, the enormous volume expansion of the active material during lithiation up to 400% (V/V 0) is held responsible for capacity fading during cycling. In this study we measured continuously the volume modifications taking place during galvanostatic lithiation of amorphous silicon thin film electrodes by in-operando neutron reflectometry experiments. The results indicate (after initial effects) a linear increase in volume as a function of lithiation time and lithium content independent of current density and initial film thickness. The experimental results are in agreement with recent atomistic calculations.
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