High-performance lithium-ion anodes using a hierarchical bottom-up approach
High-performance lithium-ion anodes using a hierarchical bottom-up approach
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DOI：
10.1038/nmat2725
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发表时间：
2010-04-01
期刊：
影响因子：
41.2
通讯作者：
Yushin, G.
中科院分区：
文献类型：
--
作者：
Magasinski, A.;Dixon, P.;Yushin, G.
硅基锂离子电池负极最近受到了极大的关注，因为它们提供的比容量超过常规石墨的数量级。这种变革性技术的应用需要能够生产安全且易于处理的阳极颗粒的合成路线，这些阳极颗粒在电池运行期间具有低体积变化和稳定的性能。在这里，我们报告了一个大规模的分层自下而上的组装路线，用于在纳米尺度上形成Si，该纳米尺度包含刚性和坚固的球体，具有不规则的通道，用于Li离子快速进入颗粒体。大的Si体积的变化，锂的插入和提取容纳的颗粒的内部孔隙率。可逆容量比现有技术的阳极（1，950 mAh g（-1））高五倍以上，并且性能稳定。该合成工艺简单、成本低、安全、适用范围广，为电极材料的合理化设计提供了新的途径。
Si-based Li-ion battery anodes have recently received great attention, as they offer specific capacity an order of magnitude beyond that of conventional graphite. The applications of this transformative technology require synthesis routes capable of producing safe and easy-to-handle anode particles with low volume changes and stable performance during battery operation. Herein, we report a large-scale hierarchical bottom-up assembly route for the formation of Si on the nanoscale-containing rigid and robust spheres with irregular channels for rapid access of Li ions into the particle bulk. Large Si volume changes on Li insertion and extraction are accommodated by the particle's internal porosity. Reversible capacities over five times higher than that of the state-of-the-art anodes (1,950 mAh g(-1)) and stable performance are attained. The synthesis process is simple, low-cost, safe and broadly applicable, providing new avenues for the rational engineering of electrode materials with enhanced conductivity and power.