A Crosslinked Polyethyleneglycol Solid Electrolyte Dissolving Lithium Bis(trifluoromethylsulfonyl)imide for Rechargeable Lithium Batteries

• DOI: 10.1002/cssc.201901587
• Publication Date: 2019-08-06T17:15:18Z
• Authors: Guiying Tian; Zijian Zhao; Tatiana Zinkevich; Katharina Elies; Frieder Scheiba; Helmut Ehrenberg
• Keywords: Polypropylene glycol; Lithium battery; Polypropylene; Diglycidyl ether

Abstract Replacing liquid electrolytes with solid ones can provide advantages in safety, and all‐solid‐state batteries are proposed to solve the issue of formation lithium dendrites. In this study, a crosslinked polymer composite electrolyte was presented, which enabled construction outstanding electrochemical behavior over long‐term cycling. The polymeric host synthesized through polymerization terminal amines O,O‐bis(2‐aminopropyl) polypropylene glycol‐ block ‐polyethylene ‐polypropylene glycol epoxy groups bisphenol A diglycidyl ether at 90 °C provided an amorphous matrix for Li + dissolution. This containing salt garnet filler exhibited high flexibility, supported favorable interfaces active materials, possessed enough mechanical strength suppress penetration Ionic conductivities higher than 5.0×10 −4 S cm −1 above 45 were obtained as well wide stability window (>4.51 V vs. Li/Li ) diffusion coefficient (≈16.6×10 −13 m 2 s ). High cycling (>500 cycles or 1000 h) demonstrated.