阳极
法拉第效率
材料科学
石墨
电极
纳米技术
电流密度
集电器
锂(药物)
硅
无定形固体
光电子学
复合材料
化学
电解质
有机化学
物理化学
内分泌学
物理
医学
量子力学
作者
Namhyung Kim,Sujong Chae,Jiyoung Ma,Minseong Ko,Jaephil Cho
标识
DOI:10.1038/s41467-017-00973-y
摘要
As fast-charging lithium-ion batteries turn into increasingly important components in forthcoming applications, various strategies have been devoted to the development of high-rate anodes. However, despite vigorous efforts, the low initial Coulombic efficiency and poor volumetric energy density with insufficient electrode conditions remain critical challenges that have to be addressed. Herein, we demonstrate a hybrid anode via incorporation of a uniformly implanted amorphous silicon nanolayer and edge-site-activated graphite. This architecture succeeds in improving lithium ion transport and minimizing initial capacity losses even with increase in energy density. As a result, the hybrid anode exhibits an exceptional initial Coulombic efficiency (93.8%) and predominant fast-charging behavior with industrial electrode conditions. As a result, a full-cell demonstrates a higher energy density (≥1060 Wh l-1) without any trace of lithium plating at a harsh charging current density (10.2 mA cm-2) and 1.5 times faster charging than that of conventional graphite.It is desirable to develop fast-charging batteries retaining high energy density. Here, the authors report a hybrid anode via incorporation of an implanted amorphous silicon nanolayer and edge-plane-activated graphite, which meets both criteria.
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