A promising PEO/LAGP hybrid electrolyte prepared by a simple method for all-solid-state lithium batteries

•A promising PEO/LAGP hybrid electrolyte prepared by a simple method which can be manufactured easily in industry scale.•The electrolyte exhibits an ionic conductivity of 6.76 × 10− 4 S cm− 1 and an electrochemical window of 0-5.3 V at 60 °C.•The hybrid electrolyte has improved electrochemical and mechanical properties.•All-solid-state battery exhibits high capacity retention and attractive capacities.

Four types of Li1.5Al0.5Ge1.5(PO4)3 (LAGP) with different particle sizes are selected as active fillers incorporated into polyethylene oxide (PEO) matrix to fabricate PEO/LAGP hybrid electrolytes at drying room. The results show that LAGP particles have a positive effect on the ionic conductivity, lithium ion transference number, electrochemical stabilities and mechanical properties. Among the PEO/LAGP hybrid electrolytes, the PEO-20%LAGP-I hybrid electrolyte exhibits a maximum ionic conductivity of 6.76 × 10− 4 S cm− 1 and an electrochemical window of 0–5.3 V at 60 °C. The possible reasons for conductivities improving are discussed through characterizing the phase transition behaviors of electrolytes. All-solid-state battery LiFePO4/Li is fabricated and presents fascinating electrochemical performance with high capacity retention (close to 90% after 50 cycles at 60 °C) and attractive capacities of 166, 155, 143 and 108 mAh g− 1 at current rates of 0.1, 0.2, 0.5 and 1 C, respectively. This work provides a promising PEO/LAGP hybrid electrolyte prepared by a simple method which can be manufactured easily in industry scale.