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Cycle-dependent Microstructural Changes of Silicon-Carbon Composite Anodes for Lithium-Ion Batteries
손명범,이동근,정동재,김아영,김한수 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.2
Si-based high capacity anodes are of the utmost importance for advancing energy density of lithium-ion batteries. The major shortcoming of Si-based anodes, however, is their poor cycle performance. To solve this problem, it is essential to understand the failure mechanisms of both the Si-based anodes. In this work, we observe the cycle-dependent microstructural evolution of a Si?C composite/graphite-blended electrode using ex situ scanning electron microscopy observations and corresponding cross-sectional elemental mapping images. We reveal that the Si particles become finer and spread through the whole electrode and act as an electrochemically active site for electrolyte decomposition reactions. This forms a solid electrolyte interphase layer on the surface of the Si particles during cycling. The resulting electrolyte decomposition products surrounding the Si particles are finely spread throughout the whole blended electrode. This cycle-dependent microstructural change is one of the main reasons for the poor capacity retention of the blended electrode.
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박형일,이동근,정동재,손명범,박철호,김한수 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.3
Real time dilation behaviors of a Si-Ti-Fe-Al alloy electrode adopting a poly (amide-imide) binder were investigated to understand the effects of thermal treatment temperature for PAI binder on the electrochemical performance of the Si-alloy electrode using an in-situ electrochemical dilatometer. In situ measurement of the electrode thickness showed that the changes in the volume of the Si electrode was suppressed by heat treatment greater than 300 °C, which well agreed with the improved cycle performance of the Si-alloy electrode thermally treated at the same temperature. Differential dilation plots of the Si-alloy electrodes were found to reveal more detailed changes in the volume of the Si-alloy electrode, thus showing that the enhanced mechanical strength of thermally treated PAI effectively could control the expansion and contraction of the Si-alloy electrode and ensuring a more stable cycle performance of the Si-alloy electrode.
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