Highly mobile segments in crystalline poly(ethylene oxide)(8): NaPF6 electrolytes studied by solid-state NMR spectroscopy
文献类型：期刊论文
| 作者 | Luo, Huan1,2; Liang, Xinmiao1,2; Wang, Liying1; Zheng, Anmin1; Liu, Chaoyang1; Feng, Jiwen1 |
| 刊名 | JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2014-02-21 |
| 卷号 | 140期号:7 |
| 英文摘要 | Two types of high-crystallinity poly(ethylene oxide)/NaPF6 electrolytes with ethylene oxide (EO)/Na molar ratios of 8:1 and 6:1, termed as PEO8:NaPF6 and PEO6:NaPF6 with M-w = 6000 g mol(-1) were prepared, and their ionic conductivity, structure, and segmental motions were investigated and compared. PEO8: NaPF6 polymer electrolyte exhibits the room-temperature ionic conductivity 7.7 x 10(-7) S cm(-1) which is about five times higher than the PEO6:NaPF6. By variable-temperature measurements of static powder spectra and H-1 spin-lattice relaxation time in rotation frame (H-1 T-1 rho), we demonstrate that crystalline segments are more highly mobile in the crystalline PEO8: NaPF6 with higher ionic conductivity than in the PEO6:NaPF6 with lower ionic conductivity. The large-angle reorientation motion of polymer segments in the PEO8:NaPF6 onsets at lower temperature (similar to 233 K) with a low activation energy 0.31 eV that is comparable with that of the pure PEO crystal. Whereas, the large-angle reorientation motion of polymer segments in the PEO6: NaPF6 starts around 313 K with a high activation energy of 0.91 eV. As a result of the temperature-enhanced large-angle reorientations, the C-13 static powder lineshape changes markedly from a low-temperature wide pattern with apparent principal values of chemical shift delta(33) < delta(22) < delta(11) to a high-temperature narrow pattern of uniaxial chemical shift anisotropy delta(33) > delta(22) (delta(11)). It is suggested that the segmental motion in crystalline PEO-salt complex promotes ionic conductivity. (C) 2014 AIP Publishing LLC. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Physics, Atomic, Molecular & Chemical |
| 研究领域[WOS] | Physics |
| 关键词[WOS] | RECHARGEABLE LITHIUM BATTERIES ; SPIN-LATTICE-RELAXATION ; POLYMER ELECTROLYTES ; IONIC-CONDUCTIVITY ; AMORPHOUS STATE ; PHASES ; COPOLYMERS ; TRANSPORT ; COMPLEXES ; DYNAMICS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000332039900034 |
| 公开日期 | 2015-07-14 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/1470]  |
| 专题 | 武汉物理与数学研究所_磁共振应用研究部 |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan Ctr Magnet Resonance, Wuhan Inst Phys & Math, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo, Huan,Liang, Xinmiao,Wang, Liying,et al. Highly mobile segments in crystalline poly(ethylene oxide)(8): NaPF6 electrolytes studied by solid-state NMR spectroscopy[J]. JOURNAL OF CHEMICAL PHYSICS,2014,140(7). |
| APA | Luo, Huan,Liang, Xinmiao,Wang, Liying,Zheng, Anmin,Liu, Chaoyang,&Feng, Jiwen.(2014).Highly mobile segments in crystalline poly(ethylene oxide)(8): NaPF6 electrolytes studied by solid-state NMR spectroscopy.JOURNAL OF CHEMICAL PHYSICS,140(7). |
| MLA | Luo, Huan,et al."Highly mobile segments in crystalline poly(ethylene oxide)(8): NaPF6 electrolytes studied by solid-state NMR spectroscopy".JOURNAL OF CHEMICAL PHYSICS 140.7(2014). |
入库方式： OAI收割
来源：武汉物理与数学研究所
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