3D porous PTFE membrane filled with PEO-based electrolyte for all solid-state lithium-sulfur batteries

Owing to the low cost and high theoretical energy density, lithium-sulfur battery has become one of the most promising energy storage battery systems. However, the inherent cycle instability and safety problems of traditional liquid lithium-sulfur batteries greatly limit their commercial applications. In this work, polytetrafluoroethylene (PTFE) membrane was introduced into Li7La3Zr2O12 (LLZO)@poly(ethylene oxide) (PEO)-based composite electrolyte as a supporting framework to prepare a new PTFE@LLZO@PEO composite electrolyte for lithium-sulfur battery. The introduction of PTFE, membrane further improved the mechanical properties and thermal stability of the electrolyte. The ionic conductivity of the prepared PTFE@LLZO@PEO solid electrolyte was 5.03 x 10(-5) S.cm(-1) at 30 degrees C and 2.54 x 10(-4) S.cm(-1) at 60 degrees C. Moreover, the symmetric battery exhibited high cycle stability (300 h). The Li-S battery based on PTFE@LLZO@PEO electrolyte exhibited excellent electrochemical performance.

Automated summary

In this study, a new composite electrolyte was prepared by introducing polytetrafluoroethylene membrane into the composite electrolyte of lithium-sulfur battery. The composite electrolyte exhibited improved mechanical properties, thermal stability, and ionic conductivity, leading to excellent electrochemical performance and cycle stability of the lithium-sulfur battery.