Su Wang, Chen Li, Yue Ma, Hongzhou Zhang, Xixi Shi, Lianqi Zhang, Dawei Song
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引用次数: 0
Abstract
Electronic-rich functional groups and flexible segments have long been perceived to be the decisive factors influencing lithium-ion transfer in polymer electrolytes, while crystallinity is regarded as the great scourge. Actually, the research on the influence of crystalline phase and crystalline plane is still in scarcity. Herein, taking poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP) as an example, new (111/201) crystal planes (belonged to β-phase) are regulated by dissolving process and clarified by Synchrotron radiation X-ray diffraction and X-ray diffraction. Density functional theory calculation indicates that the newly exposed (111/201) crystal planes provide higher binding energy with lithium ions and are conducive to provide more ion transport channels.7Li nuclear magnetic resonance of new crystalline planes contained PVDF-HFP based electrolyte shows lower field and sharper peak intensity, further proves the rapid lithium ion transfer. Therefore, a high ionic conductivity of 6.42×10−4 S cm−1 and a large lithium-ion transfer number of 0.7 are achieved. This study offers a new insight into the influence of crystalline phase and crystalline plane on the transfer of lithium ion for polymer electrolytes.
长期以来,人们一直认为富电子官能团和柔性区段是影响聚合物电解质锂离子转移的决定性因素,而结晶度则被视为最大的祸害。实际上,有关结晶相和结晶面影响的研究还很少。本文以聚偏氟乙烯-六氟丙烯(PVDF-HFP)为例,通过溶解过程调控出新的(111/201)晶面(属于β相),并通过同步辐射 X 射线衍射和 X 射线衍射加以阐明。密度泛函理论计算表明,新暴露的(111/201)晶面与锂离子的结合能更高,有利于提供更多的离子传输通道。7 含有 PVDF-HFP 基电解液的新晶面的锂核磁共振显示出更低的磁场和更尖锐的峰值强度,进一步证明了锂离子的快速传输。因此,实现了 6.42×10-4 S cm-1 的高离子电导率和 0.7 的大锂离子转移数。这项研究为聚合物电解质的结晶相和结晶平面对锂离子转移的影响提供了新的见解。
期刊介绍:
Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.