Journal Article

FZJ-2024-00658

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unveiling the electrochemical characteristics of acetonitrile-catholyte-based Na-CO2 battery

Im, E.FZJ* ; Mun, J. ; Pourasad, S. ; Baek, K. ; Ha, J. H. ; Durmus, Y. E.FZJ* ; Tempel, H.FZJ* ; Eichel, R.-A.FZJ*RWTH* ; Lee, G. (Corresponding author) ; Moon, G. D. (Corresponding author) ; Kang, S. J. (Corresponding author)

2023
Elsevier Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.cej.2023.146740  doi:10.34734/FZJ-2024-00658

Abstract: The development of metal-CO2 batteries has attracted intense attention because of their unique electrochemical reaction for utilization of CO2 gas. However, unlike the alkali metal-based O2 batteries, a limited number of combinations of aprotic electrolytes have been employed for Li(Na)–CO2 batteries due to the sluggish reaction for the formation of the Li(Na)2CO3 discharge product. Here, we demonstrate an acetonitrile (MeCN)-based catholyte for use in a hybrid cell type Na-CO2 battery. The presence of a solid ceramic separator in our hybrid cell allows the stable operation of the MeCN catholyte-based Na-CO2 battery, resulting in improved electrochemical characteristics such as low overpotential, high energy density, and long cycle stability compared to the conventional TEGDME-based electrolyte. In particular, results of molecular dynamics simulations suggest that the improved performance is mainly due to the enhanced Na+ diffusion in the electrolyte. The calculated barrier for Na+ diffusion in MeCN is approximately four times lower than that in TEGDME. Thus, this work provides a promising electrolyte combination and reveals the mechanism for the improved performance of the MeCN-based electrolyte used in the hybrid cell structure, promoting the development of Na-CO2 batteries as practical secondary energy storage devices.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 1223 - Batteries in Application (POF4-122) (POF4-122)

Appears in the scientific report 2023

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; ; ; BIOSIS Previews ; Biological Abstracts ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 15 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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