All-solid-state lithium batteries (ASSLBs) are pursued intensively as a promising next-generation energy storage technology due to their high potential to achieve superior safety and high energy/power densities.1 Sulfide-based solid-state electrolytes (SSEs) have merits of low density, high ionic conductivity, and favorable mechanical properties compared with oxide ceramic and polymer materials.2 However, large-scale production and processing of sulfide SSEs and their application in Li batteries remain a grand challenge due to their poor moisture stability and chemical/electrochemical compatibility with Li metal.3 Here we report a novel strategy to enhance moisture stability of sulfide SSEs: reversible surface coating with amphipathic organic molecules. An ultra-thin layer of amphipathic organic molecules is coated on the sulfide SSE surface via Van der Waals force. The hydrophobic long-chain alkyl tail repels water molecules away from the SSE surface, significantly enhancing the moisture stability. Moreover, this amphipathic molecular layer can be removed reversibly by low-temperature heating, having a negligible influence on the ionic conductivity. As a result, SSEs with reversible coating shows remarkably improved moisture stability under a dry room atmosphere with relative humidity (R.H.) of 0.5% and even harsh environment with R.H. of 20%, enabling practical processing of the SSE. The developed highly conductive SSE shows exceptional stability against Li metal both at room temperature and elevated temperatures. This superior interfacial stability enables a long-term cycling of Li/SSE/Li symmetric cell (&gt; 3000 hours) and deep Li plating/stripping (up to 2 mAh/cm2). Progress of the development of solid-state electrolytes will be presented at the conference.

Highly conductive sulfide solid-state electrolytes for all-solid-state li battery

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ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.