Two-Phase Electrochemical Lithiation in Amorphous Silicon
文献类型：期刊论文
| 作者 | Wang, JW ; He, Y ; Fan, FF ; Liu, XH ; Xia, SM ; Liu, Y ; Harris, CT ; Li, H ; Huang, JY ; Mao, SX ; Zhu, T |
| 刊名 | NANO LETTERS
 |
| 出版日期 | 2013 |
| 卷号 | 13期号:2页码:709 |
| 关键词 | Amorphous silicon two-phase lithiation amorphous-amorphous interface lithium-ion battery in situ transmission electron microscopy |
| ISSN号 | 1530-6984 |
| 通讯作者 | Li, H (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | Lithium-ion batteries have revolutionized portable electronics and will be a key to electrifying transport vehicles and delivering renewable electricity. Amorphous silicon (a-Si) is being intensively studied as a high-capacity anode material for next-generation lithium-ion batteries. Its lithiation has been widely thought to occur through a single-phase mechanism with gentle Li profiles, thus offering a significant potential for mitigating pulverization and capacity fade. Here, we discover a surprising two-phase process of electrochemical lithiation in a-Si by using in situ transmission electron microscopy. The lithiation occurs by the movement of a sharp phase boundary between the a-Si reactant and an amorphous LixSi (a-LixSi, x similar to 2.5) product. Such a striking amorphous-amorphous interface exists until the remaining a-Si is consumed. Then a second step of lithiation sets in without a visible interface, resulting in the final product of a-LixSi (x similar to 3.75). We show that the two-phase lithiation can be the fundamental mechanism underpinning the anomalous morphological change of microfabricated a-Si electrodes, i.e., from a disk shape to a dome shape. Our results represent a significant step toward the understanding of the electrochemically driven reaction and degradation in amorphous materials, which is critical to the development of microstructurally stable electrodes for high-performance lithium-ion batteries. |
| 资助信息 | NSF grant through University of Pittsburgh [CMMI 08010934, CMMI 1100205]; Sandia National Lab support; U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]; CAS project [KJCX2-YW-W26]; 973 project [2012CB932900] |
| 语种 | 英语 |
| 公开日期 | 2014-01-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57638]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Wang, JW,He, Y,Fan, FF,et al. Two-Phase Electrochemical Lithiation in Amorphous Silicon[J]. NANO LETTERS,2013,13(2):709. |
| APA | Wang, JW.,He, Y.,Fan, FF.,Liu, XH.,Xia, SM.,...&Zhu, T.(2013).Two-Phase Electrochemical Lithiation in Amorphous Silicon.NANO LETTERS,13(2),709. |
| MLA | Wang, JW,et al."Two-Phase Electrochemical Lithiation in Amorphous Silicon".NANO LETTERS 13.2(2013):709. |
入库方式： OAI收割
来源：物理研究所
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