Effects of HO on Improving the Performance of a Solid Composite Electrolyte Fabricated via an Air-Processable Technique.

Inert atmosphere is normally necessary for fabrication of solid composite electrolytes (SCEs) as a crucial part of solid-state Li-metal batteries in order to avoid undesirable reactions induced by ambient moisture. Herein, we developed an air-processable technique to fabricate SCEs by employing LiCFSO (LiOTf) as the Li salt, which was combined with LiLaZrTaO (LLZTO) as the fast Li-conductor and polyvinylidene difluoroethylene/polyvinyl acetate (PVDF/PVAC) as the polymer matrix. With the assistance of trace HO dissolved in electrolyte solution, the room-temperature Li conductivity of the obtained aSCE reached as high as 5.