期刊
NANO LETTERS
卷 13, 期 11, 页码 5578-5584出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl403231v
关键词
Silicon nanowire; graphene; volumetric capacity; nanoscale system engineering lithium ion battery
类别
资金
- Ministry of Science and Technology of China [2012CB933403]
- National Natural Science Foundation of China [21173057, 21273054, 51302045]
- Beijing Municipal Science and Technology Commission [Z121100006812003]
- Chinese Academy of Sciences
The nanostructuring of silicon (Si) has recently received great attention, as it holds potential to deal with the dramatic volume change of Si and thus improve lithium storage performance. Unfortunately, such transformative materials design principle has generally been plagued by the relatively low tap density of Si and hence mediocre volumetric capacity (and also volumetric energy density) of the battery. Here, we propose and demonstrate an electrode consisting of a textured silicon@graphitic carbon nanowire array. Such a unique electrode structure is designed based on a nanoscale system engineering strategy. The resultant electrode prototype exhibits unprecedented lithium storage performance, especially in terms of volumetric capacity, without the expense of compromising other components of the battery. The fabrication method is simple and scalable, providing new avenues for the rational engineering of Si-based electrodes simultaneously at the individual materials unit scale and the materials ensemble scale.
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