open access

https://hdl.handle.net/2115/97359

Acetonitrile-Based Highly Concentrated Electrolytes for High-Power Organic Sodium-Ion Batteries

英語

Sodium croconate molecules

2025-01-15

American Chemical Society

ACS applied materials & interfaces

17(2)

3316-3323

Sodium croconate, a high-voltage organic cathode material, can be applied to high-energy-density and cost-effective organic sodium-ion batteries (OSIBs) as an alternative to traditional lithium-ion batteries. However, organic molecular cathodes generally dissolve into the electrolyte, leading to poor cyclability. Thus, an electrolyte that can address the present limitations and further facilitate the fabrication of highly reversible OSIBs must be developed. To address this gap in the literature, in this study, we demonstrate an acetonitrile (AN)-based highly concentrated electrolyte (HCE) with sodium bis(fluorosulfonyl)imide (NaFSI). This electrolyte has an ionic conductivity of 12.1 mS cm-1, which is higher than those of previously reported HCEs. Moreover, the developed HCE (NaFSI:AN molar ratio of 1:2.7) exhibits a high Na+ transference number of 0.49. A full-cell OSIB bearing this electrolyte demonstrates high-power operation with improved capacity retention. The solvent-free electrolyte with the solvation structure of the [2Na+-FSI-] aggregate suppresses the dissolution of organic molecules, leading to their high performance.

学術雑誌論文

Accepted Manuscript

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces ACS applied materials & interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/articlesonrequest/AOR-ANPEJWURICRAFIIJJUFH.

1944-8244