Orientation-Dependent Lithium Miscibility Gap in LiFePO4
文献类型：期刊论文
| 作者 | Li, ZJ; Yang, JX; Li, CJ; Wang, SC; Zhang, L; Zhu, KJ; Wang, XH; Wang, XH (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China. |
| 刊名 | CHEMISTRY OF MATERIALS
 |
| 出版日期 | 2018-02-13 |
| 卷号 | 30期号:3页码:874-878 |
| 关键词 | Phase-transition Room-temperature Li-insertion/extraction Coherency Strain Solid-solution Lixfepo4 Fepo4 Nanoparticles Electrodes Kinetics |
| ISSN号 | 0897-4756 |
| 英文摘要 | [100](Pnma) is believed to be a tough diffusion direction for Li+ in LiFePO4, leading to the belief that the rate performance of [100]-oriented LiFePO4 is poor. Recent work revealed that reducing the dimension of the LiFePO4 phase to 12 nm in the [100] direction increased the extent of Li solid solution between LiFePO4 and FePO4, which produced an increase in the active population and excellent rate performance, but the lithiation/delithiation mechanism for this interesting phenomenon remains to be unraveled. Here we report, by using operando X-ray diffraction, the phase transition path involved in the lithiation/delithiation process is single-phase featured. This work presents one of the first experimental demonstrations that decreasing the dimension of LiFePO4 in the [100] direction to the LiFePO4/FePO4 equilibrium phase boundary width can improve the solid solubility of both the end solid solutions (Li alpha FePO4 and Li1-beta FePO4) and decrease the miscibility gap of LiFePO4, demonstrating a highly orientation-dependent lithium miscibility gap.; [100](Pnma) is believed to be a tough diffusion direction for Li+ in LiFePO4, leading to the belief that the rate performance of [100]-oriented LiFePO4 is poor. Recent work revealed that reducing the dimension of the LiFePO4 phase to 12 nm in the [100] direction increased the extent of Li solid solution between LiFePO4 and FePO4, which produced an increase in the active population and excellent rate performance, but the lithiation/delithiation mechanism for this interesting phenomenon remains to be unraveled. Here we report, by using operando X-ray diffraction, the phase transition path involved in the lithiation/delithiation process is single-phase featured. This work presents one of the first experimental demonstrations that decreasing the dimension of LiFePO4 in the [100] direction to the LiFePO4/FePO4 equilibrium phase boundary width can improve the solid solubility of both the end solid solutions (Li alpha FePO4 and Li1-beta FePO4) and decrease the miscibility gap of LiFePO4, demonstrating a highly orientation-dependent lithium miscibility gap. |
| 学科主题 | Chemistry, Physical ; Materials Science, Multidisciplinary |
| 语种 | 英语 |
| 资助机构 | Youth Innovation Promotion Association; Chinese Academy of Sciences (CAS) [2011152]; Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund [U1501501] |
| 公开日期 | 2018-06-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/79504]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Wang, XH (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Li, ZJ,Yang, JX,Li, CJ,et al. Orientation-Dependent Lithium Miscibility Gap in LiFePO4[J]. CHEMISTRY OF MATERIALS,2018,30(3):874-878. |
| APA | Li, ZJ.,Yang, JX.,Li, CJ.,Wang, SC.,Zhang, L.,...&Wang, XH .(2018).Orientation-Dependent Lithium Miscibility Gap in LiFePO4.CHEMISTRY OF MATERIALS,30(3),874-878. |
| MLA | Li, ZJ,et al."Orientation-Dependent Lithium Miscibility Gap in LiFePO4".CHEMISTRY OF MATERIALS 30.3(2018):874-878. |
入库方式： OAI收割
来源：金属研究所
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