A new flame-retardant polymer electrolyte with enhanced Li-ion conductivity for safe lithium-sulfur batteries

Flame-retardant polymer electrolytes (FRSPEs) are attractive due to their potential for fundamentally settling the safety issues of liquid electrolytes. However, the current FRSPEs have introduced large quantity of flame-retardant composition which cannot conduct lithium ions, thus decreasing the Li-ion conductivity. Here, we synthesize a novel liquid monomer 2-((bis((2-oxo-1,3-dioxolan-4-yl) methoxy) phosphoryl) oxy) ethyl acrylate (BDPA) for preparing FRSPE by in-situ polymerization, in which PBDPA polymer can not only conduct lithium ions, but also prevent burning. The prepared FRSPE demonstrated outstanding flame-retardant property, favorable lithium-ion conductivity of 5.65 x 10(-4) S cm(-1) at ambient temperature, and a wide electrochemical window up to 4.5 V. Moreover, the Li/in-situ FRSPE/S@pPAN cell exhibited favorable electrochemical performances. We believe that this work provides an effective strategy for establishing high-performance fireproof quasi-solid-state battery system. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

Automated summary

Flame-retardant polymer electrolytes (FRSPEs) have been successfully developed by introducing a novel liquid monomer with flame-retardant composition, which effectively solves the poor lithium ion conductivity issue of traditional FRSPEs. With outstanding flame-retardant property and favorable lithium ion conductivity, the prepared FRSPE shows excellent electrochemical performance.