Nanowerk October 24, 2023 Researchers at MIT have introduced Li-garnet Li7La3Zr2O12−d (LLZO) as a suitable ceramic due to its high Li+ conductivity and wide electrochemical stability window. However, high sintering temperatures raise concerns about the cathode interface stability, production costs, and energy consumption for scalable manufacture. They developed a “sinter-free” route to stabilize cLLZO as films at half of its sinter temperature. They established a time-temperature-transformation (TTT) diagram which captured the amorphous-to-crystalline LLZO transformation based on crystallization enthalpy analysis and confirmed stabilization of thin-film cLLZO at record low temperatures of 500 °C. According to the researchers their findings pave the way […]
Tag Archives: Solid state batteries
Flexible solid electrolytes for all-solid-state lithium batteries
Phys.org October 3, 2022 The thick electrolyte layer and rigid nature as well as poor interfacial contact of doped garnet-type solid electrolytes are obstacles for its application in all-solid-state lithium batteries. Through solvent-free procedure researchers in China developed an ultrathin flexible Li6.4La3Zr1.4Ta0.6O12- (LLZTO-) based solid electrolyte with 90 wt% LLZTO. The resulting film exhibited ultrahigh ionic conductance of 41.21 mS at 30°C, excellent oxidation stability of 4.6 V, superior thermal stability and nonflammability. The assembled Li||LiFePO4 pouch cell with integrated electrolyte/cathode interface exhibited excellent rate performances and cycle performances with a capacity retention of 71.4% from 153 mAh g-1 to 109.2 mAh g-1 at 0.1 C […]