F. Gerbig , N. Röttgen , M. Holzapfel , G. Dück , M. Finsterbusch , H. Nirschl
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引用次数: 0
Abstract
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.
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.