解开聚合物-陶瓷电解质中的离子传输:对超离子界面相的洞察

IF 4.2 3区 工程技术 Q2 ELECTROCHEMISTRY
F. Gerbig , N. Röttgen , M. Holzapfel , G. Dück , M. Finsterbusch , H. Nirschl
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引用次数: 0

摘要

研究了钠离子电池用聚乙烯氧化物(PEO)和陶瓷填料复合固体电解质(CSEs)中的输运现象。数值微观结构模拟,结合电导率实验测量,探讨了离子在这些材料中的输运机制。与纯聚合物相比,加入PEO基质并没有显著提高离子电导率。然而,含有CSE的材料在电导率方面表现出显著的改善。尽管有这些增强,但测量的电导率仍然低于假设离子通过聚合物和陶瓷相完全传输的模型的预测,这表明通过陶瓷填料完全传输电荷的假设过于乐观。数据表明,陶瓷填料诱导的PEO基体中的非晶化并不是CSE离子电导率增强的主要驱动因素,因为在室温和PEO的玻璃化转变温度以上都观察到改善。对观察到的电导率增强的一个更合理的解释是在聚合物-陶瓷界面上存在超离子界面相。模拟结果表明,该界面相具有亚微米厚度,且离子电导率高于大块PEO,在促进离子传输中起着重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unraveling ionic transport in polymer-ceramic electrolytes: Insights into superionic interphases
This study investigates the transport phenomena in composite solid electrolytes (CSEs) based on polyethylene oxide (PEO) and ceramic fillers for sodium-ion batteries. Numerical microstructure simulations, paired with experimental conductivity measurements, were conducted to explore the mechanisms of ionic transport in these materials. Incorporating
into a PEO matrix did not significantly enhance ionic conductivity compared to the pure polymer. However, a CSE containing
showed notable improvements in conductivity. Despite these enhancements, the measured conductivities remained lower than predicted by models assuming full ionic transport through both the polymer and ceramic phases, suggesting that the assumption of complete charge transport through the ceramic filler is overly optimistic. The data suggests that amorphization in the PEO matrix induced by ceramic fillers is not the main driver for enhanced ionic conductivity of the CSE, as improvements were observed at both room temperature and above the glass transition temperature of PEO. A more plausible explanation for the observed conductivity enhancement lies in the presence of a superionic interphase at the polymer–ceramic interface. Simulations suggest that this interphase, with submicrometer thickness and ionic conductivity higher than those of the bulk PEO, plays a significant role in facilitating ion transport.
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来源期刊
Electrochemistry Communications
Electrochemistry Communications 工程技术-电化学
CiteScore
8.50
自引率
3.70%
发文量
160
审稿时长
1.2 months
期刊介绍: Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.
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