Mitigating the P2-O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction
文献类型：期刊论文
| 作者 | BSRF用户 |
| 刊名 | JOURNAL OF MATERIALS CHEMISTRY A
 |
| 出版日期 | 2021 |
| 卷号 | 9期号:17页码:10803--10811 |
| ISSN号 | 2050-7488 |
| DOI | 10.1039/d1ta01433a |
| 文献子类 | Article |
| 英文摘要 | P2-type Na2/3Ni1/3Mn2/3O2 is one of the most promising cathode candidates for sodium-ion batteries due to its high specific capacity and high working voltage. However, a detrimental P2-O2 phase transition usually occurs at a high voltage (>4.2 V) leading to poor cycle stability. Herein, we propose to mitigate this critical issue through a controlled F-/Ca2+ dual-doping strategy with CaF2 as a dopant. The divalent Ca2+ ion doped in the Na layer stabilizes the layered structure at a high voltage when excessive Na+ is extracted. The more electronegative F- ion forms a stronger transition metal (TM)-F bond and reduces the electrostatic repulsion between the oxygen layers impeding the gliding of TMO2 layers. The Ca2+/F- co-doping successfully suppresses the unfavorable P2-O2 phase transition, and significantly improves the structural stability and cycling performance (27.1% vs. 87.2% after 500 cycles at 1C). Furthermore, density functional theory calculations combined with experimental tests reveal that the incorporation of Ca2+ and F- in Na sites and O sites facilitates the electronic and ionic conductivity owing to Na+/vacancy disordering, which enhances the high-rate capability. This study provides some insights into the design of long-life and high-rate cathode materials for sodium-ion batteries. |
| 电子版国际标准刊号 | 2050-7496 |
| WOS研究方向 | Chemistry ; Energy & Fuels ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000641723100001 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/293179]  |
| 专题 | 北京同步辐射装置 |
| 推荐引用方式 GB/T 7714 | BSRF用户. Mitigating the P2-O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction[J]. JOURNAL OF MATERIALS CHEMISTRY A,2021,9(17):10803--10811. |
| APA | BSRF用户.(2021).Mitigating the P2-O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction.JOURNAL OF MATERIALS CHEMISTRY A,9(17),10803--10811. |
| MLA | BSRF用户."Mitigating the P2-O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction".JOURNAL OF MATERIALS CHEMISTRY A 9.17(2021):10803--10811. |
入库方式： OAI收割
来源：高能物理研究所
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