Balance between ion migration and electron transport in composite cathodes for all-solid-state lithium-sulfur batteries

摘要: All-solid-state lithium-sulfur batteries (ASSLSBs) are strong candidates for next-generation energy-storage systems owing to their high theoretical energy density and the ability to eliminate the shuttle effect. The insulation of sulfur in solid-state cathodes requires additional ionic and electronic conductors, where the balance between ion and electron transport is crucial for a stable electrochemical reaction. In addition, for high-energy-density batteries, it is important to develop composite cathodes with high sulfur content and less amount of inactive substances. Herein, we investigate the balance between ion migration and electron transport by adjusting the content of sulfide electrolyte Li 10 GeP 2 S 12 (LGPS) and carbon nanotubes (CNTs) under high sulfur content (40% of weight fraction). Sulfur cathodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy …