{"title":"通过掺锰/掺菲双重掺杂优化 Na4Fe3(PO4)2P2O7 阴极的电子自旋态以提高钠的储存能力","authors":"Yukun Xi, Xiaoxue Wang, Hui Wang, Mingjun Wang, Guangjin Wang, Junqi Peng, Ningjing Hou, Xing Huang, Yanyan Cao, Zihao Yang, Dongzhu Liu, Xiaohua Pu, Guiqiang Cao, Ruixian Duan, Wenbin Li, Jingjing Wang, Kun Zhang, Kaihua Xu, Jiujun Zhang, Xifei Li","doi":"10.1002/adfm.202309701","DOIUrl":null,"url":null,"abstract":"<p>A NASICON-type Mn/F dual-doping Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>P<sub>2</sub>O<sub>7</sub> cathode material is successfully synthesized via a spray drying method. A medium-spin of Fe is measured by DFT calculation, X-ray absorption near edge structure (XANES), temperature-dependent magnetization susceptibility (M−T) measurement, and electron paramagnetic resonance (EPR) tests. It indicates that the <i>e</i><sub>g</sub> orbital occupation of Fe<sup>2+</sup> can be finely regulated, thus optimizing the bond strength between the oxidation and reduction processes. Furthermore, from UV−vis DRS and four-point probe conductivity measurements, it can be seen that, after adjusting the electron spin states, the band gap of the material has decreased from 1.01 to 0.80 eV, and the electronic conductivity has increased from 8.5 to 24.4 µS cm<sup>−1</sup>, thereby leading to competitive electrochemical performance. The as-optimized Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>P<sub>2</sub>O<sub>7</sub> displays both excellent rate performance (121.0 and 104.9 mAh g<sup>−1</sup> at 0.1 C and 5 C, respectively) and outstanding cycling stability (88.5% capacity retention after 1000 cycles at 1 C). The results indicate that this low-cost Mn/F dual-doping Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>P<sub>2</sub>O<sub>7</sub> cathode can be a competitive candidate material for sodium-ion batteries.</p>","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":null,"pages":null},"PeriodicalIF":18.5000,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Optimizing the Electron Spin States of Na4Fe3(PO4)2P2O7 Cathodes via Mn/F Dual-Doping for Enhanced Sodium Storage\",\"authors\":\"Yukun Xi, Xiaoxue Wang, Hui Wang, Mingjun Wang, Guangjin Wang, Junqi Peng, Ningjing Hou, Xing Huang, Yanyan Cao, Zihao Yang, Dongzhu Liu, Xiaohua Pu, Guiqiang Cao, Ruixian Duan, Wenbin Li, Jingjing Wang, Kun Zhang, Kaihua Xu, Jiujun Zhang, Xifei Li\",\"doi\":\"10.1002/adfm.202309701\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>A NASICON-type Mn/F dual-doping Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>P<sub>2</sub>O<sub>7</sub> cathode material is successfully synthesized via a spray drying method. A medium-spin of Fe is measured by DFT calculation, X-ray absorption near edge structure (XANES), temperature-dependent magnetization susceptibility (M−T) measurement, and electron paramagnetic resonance (EPR) tests. It indicates that the <i>e</i><sub>g</sub> orbital occupation of Fe<sup>2+</sup> can be finely regulated, thus optimizing the bond strength between the oxidation and reduction processes. Furthermore, from UV−vis DRS and four-point probe conductivity measurements, it can be seen that, after adjusting the electron spin states, the band gap of the material has decreased from 1.01 to 0.80 eV, and the electronic conductivity has increased from 8.5 to 24.4 µS cm<sup>−1</sup>, thereby leading to competitive electrochemical performance. The as-optimized Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>P<sub>2</sub>O<sub>7</sub> displays both excellent rate performance (121.0 and 104.9 mAh g<sup>−1</sup> at 0.1 C and 5 C, respectively) and outstanding cycling stability (88.5% capacity retention after 1000 cycles at 1 C). The results indicate that this low-cost Mn/F dual-doping Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>P<sub>2</sub>O<sub>7</sub> cathode can be a competitive candidate material for sodium-ion batteries.</p>\",\"PeriodicalId\":112,\"journal\":{\"name\":\"Advanced Functional Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":18.5000,\"publicationDate\":\"2023-12-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Advanced Functional Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/adfm.202309701\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Functional Materials","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/adfm.202309701","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
通过喷雾干燥法成功合成了一种 NASICON 型 Mn/F 双掺杂 Na4Fe3(PO4)2P2O7 阴极材料。通过 DFT 计算、X 射线吸收近边缘结构 (XANES)、随温度变化的磁化率 (M-T) 测量和电子顺磁共振 (EPR) 测试测量了铁的中等自旋。结果表明,Fe2+ 的eg 轨道占据可以进行精细调节,从而优化氧化和还原过程之间的键强度。此外,从紫外可见 DRS 和四点探针电导率测量结果可以看出,调整电子自旋态后,材料的带隙从 1.01 eV 减小到 0.80 eV,电子电导率从 8.5 µS cm-1 提高到 24.4 µS cm-1,从而实现了具有竞争力的电化学性能。优化后的 Na4Fe3(PO4)2P2O7 不仅具有优异的速率性能(0.1 C 和 5 C 条件下分别为 121.0 和 104.9 mAh g-1),而且具有出色的循环稳定性(1 C 条件下循环 1000 次后容量保持率为 88.5%)。研究结果表明,这种低成本的锰/钛双掺杂 Na4Fe3(PO4)2P2O7 正极可作为钠离子电池的一种有竞争力的候选材料。
Optimizing the Electron Spin States of Na4Fe3(PO4)2P2O7 Cathodes via Mn/F Dual-Doping for Enhanced Sodium Storage
A NASICON-type Mn/F dual-doping Na4Fe3(PO4)2P2O7 cathode material is successfully synthesized via a spray drying method. A medium-spin of Fe is measured by DFT calculation, X-ray absorption near edge structure (XANES), temperature-dependent magnetization susceptibility (M−T) measurement, and electron paramagnetic resonance (EPR) tests. It indicates that the eg orbital occupation of Fe2+ can be finely regulated, thus optimizing the bond strength between the oxidation and reduction processes. Furthermore, from UV−vis DRS and four-point probe conductivity measurements, it can be seen that, after adjusting the electron spin states, the band gap of the material has decreased from 1.01 to 0.80 eV, and the electronic conductivity has increased from 8.5 to 24.4 µS cm−1, thereby leading to competitive electrochemical performance. The as-optimized Na4Fe3(PO4)2P2O7 displays both excellent rate performance (121.0 and 104.9 mAh g−1 at 0.1 C and 5 C, respectively) and outstanding cycling stability (88.5% capacity retention after 1000 cycles at 1 C). The results indicate that this low-cost Mn/F dual-doping Na4Fe3(PO4)2P2O7 cathode can be a competitive candidate material for sodium-ion batteries.
期刊介绍:
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