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[½»Á÷] ½»Á÷In situ atomic-scale imaging of electrochemical lithiation in silicon ÒÑÓÐ2È˲ÎÓë

In situ atomic-scale imaging of electrochemical lithiation in silicon


In lithium-ion batteries, the electrochemical reaction between the electrodes and lithium is a critical process that controls the capacity, cyclability and reliability of the battery. Despite intensive study, the atomistic mechanism of the electrochemical reactions occurring in these solid-state electrodes remains unclear. Here, we show that in situ transmission electron microscopy can be used to study the dynamic lithiation process of single-crystal silicon with atomic resolution. We observe a sharp interface (¡«1 nm thick) between the crystalline silicon and an amorphous LixSi alloy. The lithiation kinetics are controlled by the migration of the interface, which occurs through a ledge mechanism involving the lateral movement of ledges on the close-packed {111} atomic planes. Such ledge flow processes produce the amorphous LixSi alloy through layer-by-layer peeling of the {111} atomic facets, resulting in the orientation-dependent mobility of the interfaces.[ Last edited by zlin on 2012-11-7 at 16:48 ]
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6Â¥: Originally posted by »ÆÀÚ314 at 2012-11-08 21:01:26
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7¥: Originally posted by Īľ at 2012-11-08 21:15:43
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