Non-flammable electrolytes as solid-state batteries enhancers

Solid-state batteries (SSBs) pave the way to safer and higher energy density batteries. But the performances of their electrolytes remain a hurdle, as they most often lead to poor contact and ion transfer across interfaces. This is why the addition of organic liquid electolytes to form gel electrolytes and/or to “wet” the interfaces is widely used by SSB developers to enhance performances. While this strategy efficiently lowers the interfacial resistance, it is detrimental to safety. This presentation details the performances of a range of high voltage and nonflammable liquid electrolytes, for several anodes and cathodes chemistries. It also shows how such electrolytes help to unlock SSBs technology by enhancing ion transfer across interfaces, increasing ionic conductivity of solid-state electrolytes, eliminating the requirement of stack pressure application, while preserving safety properties.