High-Voltage Superionic Halide Solid Electrolytes for All-Solid-State Li-Ion Batteries

All-solid-state Li-ion batteries (ASSBs), considered to be potential next-generation energy storage devices, require solid electrolytes (SEs). Thiophosphate-based materials are popular, but these sulfides exhibit poor anodic stability and require specialty coatings on lithium metal oxide cathodes. Moreover, electrode designs aimed at high energy density are limited by their narrow electrochemical stability window. Here, we report new mixed-metal halide Li3–xM1–xZrxCl6 (M = Y, Er) SEs with high ionic conductivity—up to 1.4 mS cm–1 at 25 °C—that are stable to high voltage. Substitution of M (M = Y, Er) by Zr is accompanied by a trigonal-to-orthorhombic phase transition, and structure solution using combined…

• B
  BASF
• NS
  Natural Sciences and Engineering Research Council of Canada