Application of advanced Wide-Temperature range and flame retardant “Leaf-Vein” Structured functionality composite Quasi-Solid-State electrolyte

Abstract

Currently the advancement of lithium batteries have led to their widespread adoption in cutting-edge applications, with a heightened focus on their stability and safety in extreme environments. Traditional liquid electrolytes present challenges such as flammability, leakage, and limited operating temperature ranges, impeding the progress of electrochemical energy storage devices. Quasi-solid-state electrolytes(QSE) have emerged as a promising solution to overcome these limitations. Hydrogel electrolytes have garnered significant research attention due to their rapid ion conductivity, flexibility, functionality, low cost, and environmental compatibility. However, hydrogel electrolytes still face challenges such as narrow electrochemical window, low mechanical strength, and susceptibility to freezing. Herein, this study introduces a novel “leaf-vein” structured QSE, fabricated by combining a flexible hydrogel (UV in-situ curing) with a robust nanofiber network (electrospinning). The original QSE exhibits flame retardant (30 min non-flammability), broad electrochemical window (4.2 V), freeze resistance (- 60 °C) with 0.25 MPa, and self-healing capabilities. The assembled full battery demonstrates exceptional electrochemical stability at ultra-low temperatures. This distinctive structure of the QSE indicates novel insights and directions for the design and material selection of advanced electrolyte materials, enabling secure applications of electrochemical energy storage in specialized domains particularly deep space and polar exploration.