Graphene fluoride as a conductive agent for Li-argyrodite electrolyte containing all-solid-state batteries. (September 2022)

• Record Type: Journal Article
• Authors: Dai, X.; Song, J.H.; Wang, J.E.; Chen, X.; Kim, D.K.; Kim, D.J.
• Is Part Of: Materials today chemistry. Volume 25(2022)
• Publication Date: 2022-09
• Subjects: Solid-state electrolyte -- Conductive agents -- Interfacial stability -- Microwave-induced exfoliation -- Lithium fluoride; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2022.100967
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: A sulfide-based Li-argyrodite, Li6 PS5 X (X = Cl, Br, I), is a promising solid-state electrolyte candidate for next-generation all-solid-state batteries. The compound features high ionic conductivity, which is attributed to the high polarizability of sulfur and anion site disorder, providing advantageous crystallographic geometries for Li-ions to occupy and diffuse. However, the chemical instability of Li6 PS5 Cl during cycling limits its implementation in practical applications. This study employs graphene fluoride as a conductive agent for the cathode composite to alleviate the undesirable decomposition reactions at the electrolyte interface. The combined measurements of time-dependent X-ray photoelectron spectroscopy and electrochemical analysis confirmed that graphene fluoride significantly enhances the chemical stability of the electrolyte interface, yielding a stable cycling performance. Highlights: Employing graphene fluoride as a conductive agent in Li6 PS5 Cl argyrodite significantly reduces the phase decomposition. Graphene fluoride induces the formation of a LiF-enriched electrolyte interface. Graphene fluoride-containing cathode exhibits improved electrochemical performance compared to conventional electrodes.