Comparing one- and two-dimensional heteronanostructures as silicon-based lithium ion battery anode materials.
Comparing one- and two-dimensional heteronanostructures as silicon-based lithium ion battery anode materials.
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DOI：
10.1021/nn203480h
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发表时间：
2011-10
期刊：
影响因子：
17.1
通讯作者：
Jin Xie;Xiaogang Yang;Sa Zhou;Dunwei Wang
中科院分区：
文献类型：
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作者：
Jin Xie;Xiaogang Yang;Sa Zhou;Dunwei Wang
先进的能量转换和存储设备，如太阳能电池，超级电容器和锂（Li）离子电池的性能与纳米级的电极设计密切相关。为了在这些研究领域取得重大进展，我们需要详细了解电极材料的特性如何取决于其尺寸和形态。这些信息目前还无法获得，因为以前的研究大多集中在一次了解一种类型的形态。在这里，我们报告了一个系统的研究，比较两个平台，一维纳米线和二维纳米网的纳米结构的性能。纳米线和纳米网具有相同的成分（二硅化钛）和相似的尺寸。在锂离子电池应用的框架内，它们在锂化和脱锂（以6A/g的速率）时表现出不同的稳定性，在100次重复充电和放电循环后，基于纳米网的纳米结构保持其初始稳定容量的90%，而基于硅藻土的纳米结构保持其初始稳定容量的80%。纳米网的上级稳定性归因于二维连接性，其提供比纳米线更好的结构稳定性。这项研究产生的信息应该有助于电极材料的设计，从而使复杂的纳米结构在能量转换和储存方面的应用更加广泛。
The performance of advanced energy conversion and storage devices, such as solar cells, supercapacitors, and lithium (Li) ion batteries, is intimately connected to the electrode design at the nanoscale. To enable significant developments in these research fields, we need detailed information about how the properties of the electrode materials depend on their dimensions and morphologies. This information is currently unavailable, as previous studies have mostly focused on understanding one type of morphology at a time. Here, we report a systematic study to compare the performance of nanostructures enabled by two platforms, one-dimensional nanowires and two-dimensional nanonets. The nanowires and nanonets shared the same composition (titanium disilicide) and similar sizes. Within the framework of Li ion battery applications, they exhibited different stabilities upon lithiation and delithiation (at a rate of 6 A/g), the nanonets-based nanostructures maintaining 90% and the nanowires-based ones 80% of their initial stable capacities after 100 cycles of repeated charge and discharge. The superior stability of the nanonets was ascribed to the two-dimensional connectivity, which afforded better structural stability than nanowires. Information generated by this study should contribute to the design of electrode materials and thereby enable broader applications of complex nanostructures for energy conversion and storage.