In-situ preparation of gel polymer electrolyte with glass fiber membrane for lithium batteries

A poly (butyl acrylate) (PBA) based gel polymer electrolyte supported by glass fiber membrane (GF-PBA) has been successfully prepared by in-situ polymerization. It is demonstrated that the GF-PBA possesses high ion conductivity (2.52 × 10−4 S cm−1 at room temperature), superior electrochemical stability (5.04 V), high Li ion transport number (0.56) and high thermal stability (>342 °C). Compared with traditional polypropylene and cellulose membranes, glass fiber membrane exhibits excellent electrochemical and thermal stability. Spectroscopy results show that the silicon-oxygen bonds in the glass fiber can promote the dissociation of lithium salts to facilitate Li+ transport. Furthermore, the LiFePO4/GF-PBA/Li cells prepared by in-situ polymerization exhibit low interfacial resistance, excellent cycling stability and superior rate capability at room temperature.