The role of polysulfide-saturation in electrolytes for high power applications of real world Li?S pouch cells

Abstract The lithium-sulfur (Li-S) technology is the most promising candidate for next-generation batteries due to its high theoretical specific energy and steady progress applications requiring lightweight such as aviation or heavy electric vehicles. For these applications, however, rate capability of Li-S cells requires significant improvement. Advanced electrolyte formulations in enable new pathways cell development adjustment all components. However, their at pouch level often neither evaluated nor compared state art (SOTA) LiTFSI/dimethoxyethane/dioxolane (LITFSI: lithium-bis(trifluoromethylsulfonyl)imide) electrolyte. Herein, combination sparingly polysulfide (PS) solvating hexylmethylether/1,2-dimethoxyethane (HME/DME) highly conductive carbon nanotube Buckypaper (CNT-BP) with low porosity was both coin dimethoxyethane/dioxolane reference An advanced sulfur transfer melt infiltration employed cathode production CNT-BP. Li + ion coordination HME/DME investigated by nuclear magnetic resonance (NMR) Raman spectroscopy. Additionally, ionic conductivity viscosity pristine a polysulfide-statured solution. Both electrolytes, DME/DOL-1/1 (DOL: 1,3-dioxolane) HME/DME-8/2, are then combined CNT-BP transferred multi-layered cells. This study reveals that increases drastically over (dis)charge especially DME/DOL lean regime leading better evaluation prototype an important step towards bespoke adaption practical applications.