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莫木至尊木虫 (著名写手)
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交流In situ atomic-scale imaging of electrochemical lithiation in silicon 已有2人参与
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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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Rainycc
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5楼2012-11-08 01:00:44
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莫木
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7楼2012-11-08 21:15:43
