Silicon-based nanosheets synthesized by a topochemical reaction for use as anodes for lithium ion batteries  

作　　者：Kaiqi Xu Liubin Ben Hong Li Xuejie Huang 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1 O0190, China

出　　处：《Nano Research》2015年第8期2654-2662,共9页纳米研究（英文版）

摘　　要：Silicon is the most promising anode material for the next generation high- performance lithium ion batteries. However, its commercial application is hindered by its poor performance due to the huge volume change during cycling. Although two-dimensional silicon-based materials show significantly improved performance, flexible synthesis of such materials is still a challenge. In this work, silicon-based nanosheets with a multilayer structure are synthesized for the first time by a topochemical reaction. The morphology and oxidation state of these nanosheets can be controlled by appropriate choice of reaction media and oxidants. Benefiting from the hierarchical structure and ultrathin size, when the silicon-based nanosheets are employed as anodes they exhibit a charge （delithiation） capacity of 800 mAh/g after 50 cycles with a maximum coulombic efficiency of 99.4% and good rate performance （647 mAh/g at 1 A/g）. This work demonstrates a novel method for preparing nanosheets not only for lithium ion batteries but also having various potential applications in other fields, such as catalysts, electronics and photonics.硅是为下一代的最有希望的阳极材料高效的锂离子电池。然而，它的商业应用程序被它的差的性能在骑车期间由于巨大的卷变化妨碍。尽管二维的基于硅的材料显示出显著地改进的性能，如此的材料的灵活合成仍然是挑战。在这个工作，有多层的结构的基于硅的 nanosheets 被 topochemical 反应第一次综合。这些 nanosheets 的形态学和氧化状态能被反应媒介和氧化剂的适当选择控制。得益于层次结构和 ultrathin 尺寸，当基于硅的 nanosheets 作为他们展出的阳极被采用时在 50 以后的 800 mAh/g 的一个费用(delithiation ) 能力与 99.4% 的最大的 coulombic 效率和好率性能(在 1 A/g 的 647 mAh/g ) 骑车。这个工作为为锂离子电池准备 nanosheets 而且在另外的地里有各种各样的潜在的应用表明一个新奇方法不仅例如催化剂，电子学和 photonics。

关 键 词：anode materials lithium ion batteries NANOSHEETS silicon topochemical reaction 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383[一般工业技术—材料科学与工程]