In situ Raman spectroscopy of LiFePO4: size and morphology dependence during charge and self-discharge
文献类型：期刊论文
| 作者 | Wu, J ; Dathar, GKP ; Sun, CW ; Theivanayagam, MG ; Applestone, D ; Dylla, AG ; Manthiram, A ; Henkelman, G ; Goodenough, JB ; Stevenson, KJ |
| 刊名 | NANOTECHNOLOGY
 |
| 出版日期 | 2013 |
| 卷号 | 24期号:42 |
| ISSN号 | 0957-4484 |
| 通讯作者 | Stevenson, KJ (reprint author), Univ Texas Austin, Dept Chem & Biochem, Austin, TX 78712 USA. |
| 中文摘要 | Previous studies of the size dependent properties of LiFePO4 have focused on the diffusion rate or phase transformation pathways by bulk analysis techniques such as x-ray diffraction (XRD), neutron diffraction and electrochemistry. In this work, in situ Raman spectroscopy was used to study the surface phase change during charge and self-discharge on a more localized scale for three morphologies of LiFePO4: (1) 25 +/- 6 nm width nanorods, (2) 25 +/- 6 nm width nanorods and (3) similar to 2 mu m porous microspheres. Both the large nanorod and microsphere geometries showed incomplete delithiation at the end of charge, which was most likely caused by anti-site defects along the 1D diffusion channels in the bulk of the larger particles. Based on the in situ Raman measurements, all of the morphologies studied exhibited self-discharge with time. Among them, the smallest FePO4 particles self-discharged (lithiated) the fastest. While nanostructuring LiFePO4 can offer advantages in terms of lowering anti-site defects within particles, it also creates new problems due to high surface energies that allow self-discharge. The in situ Raman spectroscopy also showed that carbon coating did not provide significant improvement to the stability of the lithiated particles. |
| 资助信息 | US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001091]; Office of Science of the US Department of Energy [DE-AC02-05CH11231]; program 'Understanding Charge Separation and Transfer at Interfaces in Energy Materials (EFRC:CST)'; Energy Frontier Research Center |
| 语种 | 英语 |
| 公开日期 | 2014-01-16 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57103]  |
| 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 | Wu, J,Dathar, GKP,Sun, CW,et al. In situ Raman spectroscopy of LiFePO4: size and morphology dependence during charge and self-discharge[J]. NANOTECHNOLOGY,2013,24(42). |
| APA | Wu, J.,Dathar, GKP.,Sun, CW.,Theivanayagam, MG.,Applestone, D.,...&Stevenson, KJ.(2013).In situ Raman spectroscopy of LiFePO4: size and morphology dependence during charge and self-discharge.NANOTECHNOLOGY,24(42). |
| MLA | Wu, J,et al."In situ Raman spectroscopy of LiFePO4: size and morphology dependence during charge and self-discharge".NANOTECHNOLOGY 24.42(2013). |
入库方式： OAI收割
来源：物理研究所
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